Small antennas satisfying bandwidth requirements in wideband, broadband and multichannel communication systems are of wide interest among researchers. This paper investigates the resonant behaviour of proximity coupled circular fractal planar monopole against circular fractal planar monopole without proximity coupling. The antennas are fed using microstripline and coplanar waveguide technique. These antennas are designed and printed on low cost FR4 substrate ( height h=1.56mm and εr =4.3) of size 110 mm by 115 mm with circular patch radius of 40 mm. The planar fractal monopole shows multiband characteristics under different configurations of feed. The monopole can be used for various compact applications in 482 MHz to 4 GHz band.
DESIGN AND DEVELOPMENT OF ITERATIVE SQUARE RING FRACTAL ANTENNA FOR DUAL BAND...jmicro
In this paper, iterative square ring fractal antenna is proposed, designed and developed for Wireless
application. The functional characteristics of the antenna such as return loss, VSWR, radiation pattern and
gain are evaluated. Compact size and multi-band compatibility are the major design requirements of
fractal antenna. The proposed antenna has the dimension of 20mm X 20mm and it supports dual band
which is designed in FR4 substrate. It resonates at 5.9 GHz and 8.8 GHz with the return loss of -33dB, -
16dB, respectively. Further, the performance of the antenna is analyzed by varying feed position, feed
width and substrate thickness. By the analysis, we concluded that the proposed antenna have better
performance at left feed position with 0.9mm of feed width at the substrate thickness of 3.2mm.
DESIGN AND DEVELOPMENT OF ITERATIVE SQUARE RING FRACTAL ANTENNA FOR DUAL BAND...jmicro
In this paper, iterative square ring fractal antenna is proposed, designed and developed for Wireless
application. The functional characteristics of the antenna such as return loss, VSWR, radiation pattern and
gain are evaluated. Compact size and multi-band compatibility are the major design requirements of
fractal antenna. The proposed antenna has the dimension of 20mm X 20mm and it supports dual band
which is designed in FR4 substrate. It resonates at 5.9 GHz and 8.8 GHz with the return loss of -33dB, -
16dB, respectively. Further, the performance of the antenna is analyzed by varying feed position, feed
width and substrate thickness. By the analysis, we concluded that the proposed antenna have better
performance at left feed position with 0.9mm of feed width at the substrate thickness of 3.2mm.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
V ERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband chara
cteristics of a circularly shaped iterative fractal
antenna with increasing number of fractal iteration
s. The four numbers of iterations are considered fo
r
this study. Also, the miniaturization characteristi
cs of the fractal antenna with increasing number of
fractal iterations have been studied. The proposed
4
th
iterated fractal antenna is designed on FR4
substrate (h = 1.56 mm and
ε
r
= 4.3). The antenna is coaxially fed using surface
mount adapter. The
proposed circularly shaped fractal antenna is found
to resonate at four centre frequencies such as 0.6
83
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna
finds applications in various compact multiband
wireless communications due its smaller size , low
cross polarization and multiband behaviour
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
DESIGN AND DEVELOPMENT OF ITERATIVE SQUARE RING FRACTAL ANTENNA FOR DUAL BAND...jmicro
In this paper, iterative square ring fractal antenna is proposed, designed and developed for Wireless
application. The functional characteristics of the antenna such as return loss, VSWR, radiation pattern and
gain are evaluated. Compact size and multi-band compatibility are the major design requirements of
fractal antenna. The proposed antenna has the dimension of 20mm X 20mm and it supports dual band
which is designed in FR4 substrate. It resonates at 5.9 GHz and 8.8 GHz with the return loss of -33dB, -
16dB, respectively. Further, the performance of the antenna is analyzed by varying feed position, feed
width and substrate thickness. By the analysis, we concluded that the proposed antenna have better
performance at left feed position with 0.9mm of feed width at the substrate thickness of 3.2mm.
DESIGN AND DEVELOPMENT OF ITERATIVE SQUARE RING FRACTAL ANTENNA FOR DUAL BAND...jmicro
In this paper, iterative square ring fractal antenna is proposed, designed and developed for Wireless
application. The functional characteristics of the antenna such as return loss, VSWR, radiation pattern and
gain are evaluated. Compact size and multi-band compatibility are the major design requirements of
fractal antenna. The proposed antenna has the dimension of 20mm X 20mm and it supports dual band
which is designed in FR4 substrate. It resonates at 5.9 GHz and 8.8 GHz with the return loss of -33dB, -
16dB, respectively. Further, the performance of the antenna is analyzed by varying feed position, feed
width and substrate thickness. By the analysis, we concluded that the proposed antenna have better
performance at left feed position with 0.9mm of feed width at the substrate thickness of 3.2mm.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
V ERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband chara
cteristics of a circularly shaped iterative fractal
antenna with increasing number of fractal iteration
s. The four numbers of iterations are considered fo
r
this study. Also, the miniaturization characteristi
cs of the fractal antenna with increasing number of
fractal iterations have been studied. The proposed
4
th
iterated fractal antenna is designed on FR4
substrate (h = 1.56 mm and
ε
r
= 4.3). The antenna is coaxially fed using surface
mount adapter. The
proposed circularly shaped fractal antenna is found
to resonate at four centre frequencies such as 0.6
83
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna
finds applications in various compact multiband
wireless communications due its smaller size , low
cross polarization and multiband behaviour
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNARicardo014
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal
antenna with increasing number of fractal iterations. The four numbers of iterations are considered for
this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of
fractal iterations have been studied. The proposed 4
th iterated fractal antenna is designed on FR4
substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The
proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband
wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
DESIGN OF PRINTED MONOPOLE ANTENNA FOR MICROWAVE COMMUNICATIONjmicro
This document summarizes the design of a printed monopole antenna for microwave applications. A fractal patch was designed and used as an initiator to create planar and vertical monopole configurations on an FR4 substrate. The planar monopole exhibited dual band behavior with bandwidths of 45.1% from 1.3-2.1 GHz and 114.9% from 4-14.7 GHz. The vertical monopole achieved an ultra-wide bandwidth of 173.7% from 0.9-13.1 GHz. Both antennas demonstrated good impedance matching across microwave bands and are suitable for various wireless communication standards.
DESIGN OF PRINTED MONOPOLE ANTENNA FOR MICROWAVE COMMUNICATIONjmicro
A printed monopole in its planar and vertical configuration has been designed, fabricated and analyzed
for microwave applications on low cost FR4 substrate material of thickness, h = 1.56 mm and relative
permittivity, εr = 4.3. The designed planar monopole has been simulated and experimented to find its
frequency response with coplanar waveguide feed to exhibit dual band characteristics with -10 dB
reflection loss bandwidth of 45.078 % (i.e. 1.5:1 between 1.334 and 2.109 GHz) and 114.92 % (i.e. 3.7: 1
between 3.99 and 14.77 GHz). The vertical monopole using the same patch has also been simulated and
experimented and -10 dB reflection loss bandwidth of 173.67% (14.2:1 between 0.925 and 13.125 GHz)
has been obtained. The antenna finds many applications in microwave bands.
— The Sierpinski fractal antenna has been analyzed
parametrically, and observed how its characteristics changing
with the variation of its different parameters. The input return
loss and input impedance have log periodic behavior that
characterizes the sierpinski monopole antenna as fractal
geometry. The band spacing and impedance matching have been
improved by using different scale factor and feeding methods.
Sierpinski monopole antenna for WLAN bands (2.4GHz and
5GHz) has been designed and simulated using Ansoft Hfss.The
operating frequencies of the proposed designs match with
IEEE802.11b (2.45GHz) and IEEE802.11a (5.20 GHz and
5.775GHz) standards which would allow WLAN operation.
This document describes a novel modified Pythagorean tree fractal monopole antenna designed for ultrawideband applications. By inserting a modified Pythagorean tree fractal structure into a conventional T-patch design, the antenna achieves a much wider impedance bandwidth and additional resonances. Increasing the fractal iterations adds new resonances. The designed antenna operates from 2.6 to 11.12 GHz with a compact size of 25 x 25 x 1 mm3. Simulation results show that adding fractal iterations generates multiple resonances and increases the impedance bandwidth. Measured results agree well with simulations, validating the antenna design.
DESIGN OF TRIPLE-BAND CPW FED CIRCULAR FRACTAL ANTENNA IJCI JOURNAL
A novel miniaturized circular fractal antenna is designed by inscribing circular slot on rectangular ground plane and successively forming circular rings connected by semi-circles for circular-fractal patch. Novel modified Coplanar Waveguide (CPW) is used as feed for fractal circular patch. The analysis of parametric variations is performed by consecutive fractal iterations, varying the radius of inscribed circle of ground plane, slots and different ground plane configurations. To further enhance gain and radiation pattern a dual inverted L slots is included in ground plane. From the results it is evident that, the proposed fractal antenna possesses triple bands at 1.8GHz, 3.5GHz and 5.5GHz. These bands are used in Digital Communication Systems (DCS) (1.8GHz), IEEE 802.16d fixed WiMAX (3.5GHz) and IEEE 802.11a WLAN (5.5GHz) applications.
Design of Tripl-Band CPW FED Circular Fractal Antenna ijcisjournal
A novel miniaturized circular fractal antenna is designed by inscribing circular slot on rectangular ground
plane and successively forming circular rings connected by semi-circles for circular-fractal patch. Novel
modified Coplanar Waveguide (CPW) is used as feed for fractal circular patch. The analysis of parametric
variations is performed by consecutive fractal iterations, varying the radius of inscribed circle of ground
plane, slots and different ground plane configurations. To further enhance gain and radiation pattern a
dual inverted L slots is included in ground plane. From the results it is evident that, the proposed fractal
antenna possesses triple bands at 1.8GHz, 3.5GHz and 5.5GHz. These bands are used in Digital
Communication Systems (DCS) (1.8GHz), IEEE 802.16d fixed WiMAX (3.5GHz) and IEEE 802.11a WLAN
(5.5GHz) applications.
This document presents the design and analysis of a microstrip patch antenna for triple band applications in digital communication systems. The antenna is designed to operate at 1.5 GHz, 2.4 GHz, and 5.5 GHz bands. It consists of a rectangular patch fed by a microstrip line with two additional arms of different lengths acting as resonators. Simulation results show the antenna achieves impedance matching across bandwidths of 700 MHz, 800 MHz, and 1 GHz at the three frequencies. It has an omnidirectional radiation pattern and gain between 5-6 dBi. The compact triple band design reduces the antenna size by 67% compared to a conventional patch antenna.
The document describes a study investigating copper nanofilm as a radiating patch for antenna applications. A 100nm thick copper nanofilm patch antenna and a 17micron thick bulk copper patch antenna were designed and fabricated on FR4 substrates. The nanofilm antenna was found to have a wider bandwidth (810MHz vs 350MHz for bulk antenna), higher return loss (-13.59dB vs -13.84dB for bulk antenna), and slightly lower gain. The increased bandwidth of the nanofilm antenna makes it suitable for applications requiring high data rate transmission such as wireless LAN. The results encourage the use of metallic nanofilms as radiating elements for antennas to improve bandwidth.
T- Shape Antenna Design for Microwave Band Applications IJEEE
The document summarizes the design and simulation of a T-shaped fractal microstrip patch antenna for microwave band applications. The antenna was designed using a fractal technique with a scaling factor of 1/3 at each iteration to achieve multiband operation. Simulation results showed resonances at 2.4 GHz, 6.8 GHz, 8 GHz, 10.8 GHz, 12.2 GHz and 15.4 GHz with bandwidths ranging from 230 MHz to 2 GHz. The antenna exhibited VSWR less than 2 and gain higher than other resonant frequencies at 2.4 GHz, 8 GHz and 15.4 GHz. The fractal antenna design achieved size reduction and multiband performance making it suitable for applications such as wireless communications.
The document describes a dual-band printed slot antenna with a fractal-based slot structure for wireless applications. The slot structure uses a modified Peano fractal curve on two sides of a rectangular slot. Simulation results show the antenna offers dual bands covering 2.4-2.7 GHz and 5.47-5.875 GHz with gains of around 2.5 dBi and 4 dBi respectively. The addition of tuning stubs enhances the dual-band behavior and radiation patterns are omnidirectional across bands. The compact antenna size of 36x45mm makes it suitable for mobile devices.
Pentagon and circular ring slot loaded rectangular microstrip monopoleIAEME Publication
The document describes the design and development of two pentagon and circular ring slot loaded rectangular microstrip monopole antennas (PCRSLRMA and PCCSLRMA) for quad-band and triple-band operation, respectively. The PCRSLRMA operates in four bands between 4-16 GHz while the PCCSLRMA operates in three bands. Both antennas exhibit omnidirectional radiation patterns. The PCRSLRMA achieves a maximum gain of 11.37 dB while the PCCSLRMA achieves 9.98 dB. The addition of the complementary circular ring slot in the PCCSLRMA enhances the bandwidth at each operating band compared to the PCRSLRMA. The proposed antennas have a simple
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Applications of artificial Intelligence in Mechanical Engineering.pdfAtif Razi
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
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VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNARicardo014
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal
antenna with increasing number of fractal iterations. The four numbers of iterations are considered for
this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of
fractal iterations have been studied. The proposed 4
th iterated fractal antenna is designed on FR4
substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The
proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683
GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband
wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
VERIFICATION OF MULTIBAND CHARACTERISTICS IN ITERATIVE FRACTAL ANTENNAjantjournal
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and εr = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
DESIGN OF PRINTED MONOPOLE ANTENNA FOR MICROWAVE COMMUNICATIONjmicro
This document summarizes the design of a printed monopole antenna for microwave applications. A fractal patch was designed and used as an initiator to create planar and vertical monopole configurations on an FR4 substrate. The planar monopole exhibited dual band behavior with bandwidths of 45.1% from 1.3-2.1 GHz and 114.9% from 4-14.7 GHz. The vertical monopole achieved an ultra-wide bandwidth of 173.7% from 0.9-13.1 GHz. Both antennas demonstrated good impedance matching across microwave bands and are suitable for various wireless communication standards.
DESIGN OF PRINTED MONOPOLE ANTENNA FOR MICROWAVE COMMUNICATIONjmicro
A printed monopole in its planar and vertical configuration has been designed, fabricated and analyzed
for microwave applications on low cost FR4 substrate material of thickness, h = 1.56 mm and relative
permittivity, εr = 4.3. The designed planar monopole has been simulated and experimented to find its
frequency response with coplanar waveguide feed to exhibit dual band characteristics with -10 dB
reflection loss bandwidth of 45.078 % (i.e. 1.5:1 between 1.334 and 2.109 GHz) and 114.92 % (i.e. 3.7: 1
between 3.99 and 14.77 GHz). The vertical monopole using the same patch has also been simulated and
experimented and -10 dB reflection loss bandwidth of 173.67% (14.2:1 between 0.925 and 13.125 GHz)
has been obtained. The antenna finds many applications in microwave bands.
— The Sierpinski fractal antenna has been analyzed
parametrically, and observed how its characteristics changing
with the variation of its different parameters. The input return
loss and input impedance have log periodic behavior that
characterizes the sierpinski monopole antenna as fractal
geometry. The band spacing and impedance matching have been
improved by using different scale factor and feeding methods.
Sierpinski monopole antenna for WLAN bands (2.4GHz and
5GHz) has been designed and simulated using Ansoft Hfss.The
operating frequencies of the proposed designs match with
IEEE802.11b (2.45GHz) and IEEE802.11a (5.20 GHz and
5.775GHz) standards which would allow WLAN operation.
This document describes a novel modified Pythagorean tree fractal monopole antenna designed for ultrawideband applications. By inserting a modified Pythagorean tree fractal structure into a conventional T-patch design, the antenna achieves a much wider impedance bandwidth and additional resonances. Increasing the fractal iterations adds new resonances. The designed antenna operates from 2.6 to 11.12 GHz with a compact size of 25 x 25 x 1 mm3. Simulation results show that adding fractal iterations generates multiple resonances and increases the impedance bandwidth. Measured results agree well with simulations, validating the antenna design.
DESIGN OF TRIPLE-BAND CPW FED CIRCULAR FRACTAL ANTENNA IJCI JOURNAL
A novel miniaturized circular fractal antenna is designed by inscribing circular slot on rectangular ground plane and successively forming circular rings connected by semi-circles for circular-fractal patch. Novel modified Coplanar Waveguide (CPW) is used as feed for fractal circular patch. The analysis of parametric variations is performed by consecutive fractal iterations, varying the radius of inscribed circle of ground plane, slots and different ground plane configurations. To further enhance gain and radiation pattern a dual inverted L slots is included in ground plane. From the results it is evident that, the proposed fractal antenna possesses triple bands at 1.8GHz, 3.5GHz and 5.5GHz. These bands are used in Digital Communication Systems (DCS) (1.8GHz), IEEE 802.16d fixed WiMAX (3.5GHz) and IEEE 802.11a WLAN (5.5GHz) applications.
Design of Tripl-Band CPW FED Circular Fractal Antenna ijcisjournal
A novel miniaturized circular fractal antenna is designed by inscribing circular slot on rectangular ground
plane and successively forming circular rings connected by semi-circles for circular-fractal patch. Novel
modified Coplanar Waveguide (CPW) is used as feed for fractal circular patch. The analysis of parametric
variations is performed by consecutive fractal iterations, varying the radius of inscribed circle of ground
plane, slots and different ground plane configurations. To further enhance gain and radiation pattern a
dual inverted L slots is included in ground plane. From the results it is evident that, the proposed fractal
antenna possesses triple bands at 1.8GHz, 3.5GHz and 5.5GHz. These bands are used in Digital
Communication Systems (DCS) (1.8GHz), IEEE 802.16d fixed WiMAX (3.5GHz) and IEEE 802.11a WLAN
(5.5GHz) applications.
This document presents the design and analysis of a microstrip patch antenna for triple band applications in digital communication systems. The antenna is designed to operate at 1.5 GHz, 2.4 GHz, and 5.5 GHz bands. It consists of a rectangular patch fed by a microstrip line with two additional arms of different lengths acting as resonators. Simulation results show the antenna achieves impedance matching across bandwidths of 700 MHz, 800 MHz, and 1 GHz at the three frequencies. It has an omnidirectional radiation pattern and gain between 5-6 dBi. The compact triple band design reduces the antenna size by 67% compared to a conventional patch antenna.
The document describes a study investigating copper nanofilm as a radiating patch for antenna applications. A 100nm thick copper nanofilm patch antenna and a 17micron thick bulk copper patch antenna were designed and fabricated on FR4 substrates. The nanofilm antenna was found to have a wider bandwidth (810MHz vs 350MHz for bulk antenna), higher return loss (-13.59dB vs -13.84dB for bulk antenna), and slightly lower gain. The increased bandwidth of the nanofilm antenna makes it suitable for applications requiring high data rate transmission such as wireless LAN. The results encourage the use of metallic nanofilms as radiating elements for antennas to improve bandwidth.
T- Shape Antenna Design for Microwave Band Applications IJEEE
The document summarizes the design and simulation of a T-shaped fractal microstrip patch antenna for microwave band applications. The antenna was designed using a fractal technique with a scaling factor of 1/3 at each iteration to achieve multiband operation. Simulation results showed resonances at 2.4 GHz, 6.8 GHz, 8 GHz, 10.8 GHz, 12.2 GHz and 15.4 GHz with bandwidths ranging from 230 MHz to 2 GHz. The antenna exhibited VSWR less than 2 and gain higher than other resonant frequencies at 2.4 GHz, 8 GHz and 15.4 GHz. The fractal antenna design achieved size reduction and multiband performance making it suitable for applications such as wireless communications.
The document describes a dual-band printed slot antenna with a fractal-based slot structure for wireless applications. The slot structure uses a modified Peano fractal curve on two sides of a rectangular slot. Simulation results show the antenna offers dual bands covering 2.4-2.7 GHz and 5.47-5.875 GHz with gains of around 2.5 dBi and 4 dBi respectively. The addition of tuning stubs enhances the dual-band behavior and radiation patterns are omnidirectional across bands. The compact antenna size of 36x45mm makes it suitable for mobile devices.
Pentagon and circular ring slot loaded rectangular microstrip monopoleIAEME Publication
The document describes the design and development of two pentagon and circular ring slot loaded rectangular microstrip monopole antennas (PCRSLRMA and PCCSLRMA) for quad-band and triple-band operation, respectively. The PCRSLRMA operates in four bands between 4-16 GHz while the PCCSLRMA operates in three bands. Both antennas exhibit omnidirectional radiation patterns. The PCRSLRMA achieves a maximum gain of 11.37 dB while the PCCSLRMA achieves 9.98 dB. The addition of the complementary circular ring slot in the PCCSLRMA enhances the bandwidth at each operating band compared to the PCRSLRMA. The proposed antennas have a simple
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PROXIMITY RING FED MULTIBAND PRINTED MONOPOLE FRACTAL ANTENNA
1. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
DOI: 10.5121/jant.2016.2401 1
PROXIMITY RING FED MULTIBAND PRINTED
MONOPOLE FRACTAL ANTENNA
Yogesh Babaraoji Thakare
Department of E&TC Engineering,
PVG’s COET, Pune Affiliated to Savitribai Phule Pune University, Pune, India
ABSTRACT
Small antennas satisfying bandwidth requirements in wideband, broadband and multichannel
communication systems are of wide interest among researchers. This paper investigates the resonant
behaviour of proximity coupled circular fractal planar monopole against circular fractal planar monopole
without proximity coupling. The antennas are fed using microstripline and coplanar waveguide technique.
These antennas are designed and printed on low cost FR4 substrate ( height h=1.56mm and εr =4.3) of size
110 mm by 115 mm with circular patch radius of 40 mm. The planar fractal monopole shows multiband
characteristics under different configurations of feed. The monopole can be used for various compact
applications in 482 MHz to 4 GHz band.
KEYWORDS
Antenna, bandwidth enhancement, compact, fractal, iterative, monopole, multiband, proximity.
1. INTRODUCTION
There is a continuing interest in broadband (BW 2:1) antennas operating over a wide frequency
range to satisfy high data rates in second to fifth generations of communication technologies for
multimedia applications. These systems need low-cost compact antennas with desired
performance characteristics. Few of the examples of such systems are mobile systems in the
second generation (2G) viz. GSM1800 and GSM1900, operating in the frequency bands 1710–
1880 MHz and 1850–1990 MHz, third generation (3G) systems viz. cdma-2000, WCDMA, and
TD-SCDMA operating in frequency band 1920–2170 MHz.
A number of recent books [1–2] and articles [3–15] have surveyed various bandwidth
enhancement techniques. The structural technique for enhancement of bandwidth of an antenna is
continuously evolving. Initially, it has involved primarily the antenna substrate. Now days both
the antenna substrate and its geometry have been targeted towards bandwidth enhancement.
Microstrip patches are modified in shape and incorporated with slots of various sizes and shapes.
The impedance matching techniques using the circuit theory approach are reported for bandwidth
enhancement [1-2]. To facilitate the increased demand for bandwidth, the planar monopoles using
printed circuit boards are also playing important role in various wireless communication
applications due to their low manufacturing cost, and easy integration into planar circuits.
2. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
2
This paper has investigated bandwidth enhancement in proximity coupled printed circular planar
fractal monopole antenna against the printed circular planar fractal monopole without proximity
coupling.
2. DESIGN OF ANTENNA
The designed antenna is a modification of Sierpinski triangular geometry incorporated in a
conventional circular microstrip patch antenna (CMPA) on iterative basis using a designed fractal
generator [13, 15-16]. The fractal generator has been designed by subtracting equilateral triangle
of dimensions 73.5 mm three times from a circle of radius, r = 40 mm as shown in Fig. 1. This
subtraction can be done in three steps 1. Subtract the triangle from circle with vertex of triangle at
0 deg., 2. Subtract triangle with vertex at 90 deg. from the geometry generated in step 1, 3.
Subtract triangle with vertex at 180 deg. from the geometry generated in step 2. The copper patch
has been designed using this generator. This patch is scaled down 4 times to be included in the
larger size iteration i.e. 2nd
iteration is accommodated in 1st
iteration, 3rd
in 2nd
iteration and 4th
in
3rd
iteration to design 4th iterated fractal antenna geometry as shown in Fig. 2.
Conventional 1st
Iteration 2nd
Iteration 3rd
Iteration 4th
Iteration
Figure 1. Design of proposed fractal circular microstrip antenna [13, 15-16].
Figure 2. Design of fourth iteration proposed fractal patch [13, 15-16].
3. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
3
A planar fractal printed monopole using this fourth iterated patch has been fabricated on low cost
FR4 (εr = 4.3 h=1.56 mm) substrate (size: 110 mm by 115 mm) and fed using 1. simple 50 Ω
microstrip transmission line with partial and full background, 2.1 mm thick proximity ring with
50 Ω microstrip transmission line with partial background, and 3. 1 mm thick proximity ring with
50 Ω coplanar waveguide feed with partial background as shown in Fig. 3, Fig. 4 and Fig. 5.
Front view Rear View
Figure 3a. Printed circular fractal planar monopole on FR4 substrate fed using 50 Ω microstrip line with
full background.
Figure 3b. Printed circular fractal planar monopole on FR4 substrate fed using 50 Ω microstrip line with
partial background.
4. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
4
Figure 4a. Design of printed circular fractal planar monopole fed using concentric proximity ring (1mm
wide with 0.5mm gap) and 50 Ω microstrip line on FR4 substrate.
Front view Rear View
Figure 4b. Photograph of printed circular fractal planar monopole fed using concentric proximity ring
(1mm wide with 0.5mm gap) and 50 Ω microstrip line on FR4 substrate.
5. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
5
Front view Rear View
Figure 5. Printed circular fractal planar monopole fed using concentric proximity ring (1mm wide with
0.5mm gap) and 50 Ω CPW line on FR4 substrate.
3. RESULTS AND DISCUSSIONS
3.1 Reflection loss
The reflection loss or reflection coefficient pattern against varying frequency of the printed
circular fractal planar monopole fed using simple 50 Ω microstripline as seen in Fig. 3a (with full
background) is simulated and measured. The results are compared in Fig. 6. Both, simulated and
measured results are in close agreement with some tolerance. These results clearly indicate the
multiband nature of the monopole. The multiband behaviour of the monopole can be attributed to
self similar iterative fractal nature of the patch. Further, the space filling nature of the monopole
antenna geometry [15] reduces the size of the antenna to become independent of the size
dependent resonance. The resonant frequencies in the antenna are a function of iteration depth.
Increasing iteration depth increases the space filling properties of the fractal patch to affect
compactness in the printed fractal monopole [15]. The measured results of the printed circular
fractal planar monopole fed using simple 50 Ω microstripline with full background (Fig. 3a ) and
partial (Fig. 3b) are compared in Fig. 7. The results show that printed fractal monopole in both the
configurations behaves as multiband antenna. But, with partial ground, the bandwidth associated
with multiple bands becomes wider than with full background. The perturbation in the bandwidth
with background size is attributed to wider impedance matching as seen in Fig. 8a and Fig. 8b
with partial background as compared to full background. The partial background couples the
multiple resonances to justify the broader bandwidth. Further, these coupling effects are not
uniform across the multiple bands. Table 1 shows the variation in bandwidth with partial and full
background in planar circular fractal monopole. With full background, the printed fractal
monopole exhibits maximum bandwidth of 2.95 % (at -10 dB reflection coefficient) compared to
6. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
6
maximum 63.50 % (at -10 dB reflection coefficient) with partial background as seen from Table
1. Further, the microstripline fed printed circular planar fractal monopole with partial background
exhibits a dual band antenna with wideband properties.
Figure 6. Measured and simulated reflection loss plot of microstripline fed printed circular planar fractal
monopole without proximity ring.
Figure 7. Effect of ground size on the reflection loss bandwidth exhibited by microstripline fed printed
circular planar fractal monopole.
7. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
7
Figure 8a. Effect of ground size on real part of impedance exhibited by microstripline fed printed circular
planar fractal monopole without proximity ring.
Figure 8b. Effect of ground size on imaginary part of impedance exhibited by microstripline fed printed
circular planar fractal monopole without proximity ring.
8. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
8
Table 1, Effect of ground size on the bandwidth exhibited by microstrpline fed printed circular planar
fractal monopole without proximity ring.
Now, the printed circular fractal planar monopole is fed using a gap coupled proximity ring with
50 Ω microstripline (Fig. 4b) and the measured results are obtained. These results are compared
with planar circular fractal monopole without the proximity ring (Fig. 3b) in Fig. 9. The lower
frequency shift is observed in proximity ring microstripline fed (partial back ground) monopole
compared to without proximity ring microstripline fed (full background) monopole from 0.860
GHz to 0.681 GHz. This indicates that incorporation of proximity ring and gap coupling
increases the size of the monopole to effect lower frequency shift. Further, the bandwidth in
multiple bands changes with background size as well as inclusion of proximity ring to indicate
their impact on coupled resonance (Fig. 7 and Fig. 8). The proximity concentric ring around the
antenna geometry with 50 ohm transmission line feed increases the bandwidth around the centre
frequencies at 0.681 GHz, 2.21 GHz, 2.94 GHz, 3.36 GHz compared to 0.860 GHz, 2.41 GHz,
3.11 GHz, 3.94 GHz with microstripline without proximity ring.
The improvement in bandwidth has been reported in Table 2. The maximum of 20 % bandwidth
has been noted with gap coupled proximity ring microstripline fed (partial background) planar
fractal printed monopole compared to 2.9 % in microstripline fed (full background) without
proximity ring.Further, the proximity ring planar fractal monopole is fed with 50 Ω CPW line.
The measured and simulated results are obtained in Fig. 10 to find a close match between them.
These results are compared with microstripline fed (partial background) proximity ring planar
circular fractal monopole as shown in Fig. 11. The CPW fed monopole has exhibited multiband
properties with small bandwidth improvements around the same resonating frequencies compared
to microstripline. This indicates that there is minimum impact on coupled resonance of
micropstripline or CPW feed when printed monopole is gap coupled using proximity ring.
9. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
9
Figure 9. Comparative reflection loss plot of printed circular planar fractal monopole fed using
microstripline with proximity ring and without proximity ring.
Figure 10. Measured and simulated reflection loss plot of CPW fed proximity ring printed circular planar
fractal monopole.
10. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
10
Figure 11. Comparative reflection loss plot of printed circular planar fractal monopole fed using
microstripline and CPW feed with proximity ring.
The imaginary and real part of impedance for proximity ring fed fractal monopole using
microstripline and CPW feed have been plotted in Fig. 12a and Fig. 12b.
Figure 12a. Imaginary part of impedance for proximity ring printed circular planar fractal monopole fed
using microstripline and CPW.
11. International Journal of Antennas (JANT) Vol.2, No.4, October 2016
11
Figure 12b. Real part of impedance for proximity ring printed circular planar fractal monopole fed using
microstripline and CPW.
Around resonant frequencies, the reactive part minimizes and real part approaching towards 50
ohm compared to other frequencies to improve impedance matching to enhance the bandwidth in
the monopole. Maximum of 12.56 % (-10 dB) bandwidth has been reported with CPW feed in
proximity ring planar fractal monopole as shown in Table 2.
Table 2, Bandwidth improvement in printed circular planar fractal monopole using gap coupled proximity
ring with microstripline and CPW line feed techniques.
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3.2 RADIATION PATTERNS
The radiation pattern of the proximity ring fractal antenna fed using microstripline and CPW
technique in azimuthal plane at 0 deg. elevation for four resonant frequencies have been shown in
Fig. 13 and Fig. 14 respectively. These patterns are similar and nearly omni-directional at all the
resonant frequencies. The maximum gains of 2.625 dB using microstripline and around 0 dB
using CPW have been observed.
Figure 13. Gain Total vs. azimuth plot for microstripline fed proximity ring printed circular planar fractal
monopole at various resonant frequencies
Figure 14. GainTotal vs. azimuth plot for CPW fed proximity ring printed circular planar fractal monopole
at various resonant frequencies.
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To obtain further insight, the radiation patterns have been studied comparatively in azimuth as
well as elevation plane at one of the resonant frequency 0.681 GHz for both microstripline and
CPW as shown in Fig. 15 and Fig. 16. These patterns show changes in orientation with change in
feed from microstripline to CPW keeping shape nearly similar with slight distortions in respective
planes. The patterns are either omini-directional or bidirectional in azimuthal plane where as
unidirectional in elevation plane with microstrip as well as CPW feed.
Figure 15. GainTotal plot for microstripline fed proximity ring printed circular planar fractal monopole at
resonant frequency 0.681 GHz.
Figure 16. GainTotal plot for CPW fed proximity ring printed circular planar fractal monopole at resonant
frequency 0.681 GHz.
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4. CONCLUSIONS
The paper emphasizes bandwidth enhancement process in printed planar circular fractal
monopole. The planar circular fractal monopole with gap coupled proximity ring shows
multiband bandwidth enhancement using microstripline as well as CPW feed techniques due to
self-similarity properties in the iterative fractal antenna. The monopole exhibits wideband
characteristics with similar and omni-directional patterns at various resonant frequencies in
azimuth plane. The planar monopole can be used for compact wideband applications. The
compact behavior of the fractal antenna can be attributed to its space filling properties. The
proposed fractal antenna can be fabricated on low cost FR4 substrate material. It is simple in
design and finds applications in various types of compact wireless communications.
ACKNOWLEDGEMENTS
The authors would like to thank everyone, just everyone!
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AUTHORS
YOGESH BABARAOJI THAKARE
Short Biography
Yogesh B. Thakare (mother-Sushilabai) is passed BE E&TC in the year 1998 with
first class from VYWS College of Engg., Badnera, Amravati University (Maharashtra
-India), ME E&TC (Microwave) in the year 2006 from Govt. College of Engg., Pune,
Pune University (Maharashtra-India) in first class and Ph.D. (Electronics) from Shivaji
University, Kolhapur (Maharashtra- India) in 2015.He has about 15 years teaching and
02 years industrial experience. He is currently working with PVG’s College of
Engineering and Technology, Parvati, Pune (Maharashtra-India) as ASSISTANT
PROFESSOR in the department of electronics and telecommunication Engg. He taught major subject like
wave theory and antenna, microwave engineering, semiconductor devices and technology, analogue and
digital communication engineering. He has 04 international and 01 national journal and 05 international
and 04 national conference publications. His current research interest is in wave propagation techniques,
microstrip antenna engineering, communication engineering and semiconductor electronics.