PRESENTATION on dual band microstrip antenna . Designing and simulation on hfss

1. A
Project on
“ DUAL BAND MICROSTRIP ANTENNA”
PRESENTED BY
Mr. Kadri Anas (20100354)
UNDER GUIDANCE OF
Mr. S. V. Khobragade
DEPARTMENT OF ELECTRONICS & TELECOMMUNICATION ENGINEERING
DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY
LONERE-RAIGAD
2013-2014

2. Overview.
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Antenna
Microstrip Patch Antenna
Feeding Techniques
Advantages/Disadvantages
Dual Band Microstrip Antenna
Future Work
References

3. Antenna.
• A metallic device for radiating or receiving radio waves.
• A transitional structure between free space & a guiding device.
Types Of Antennas
a) Wire Antennas
b) Aperture Antennas
c) Microstrip Antennas
d) Reflector Antennas
e) Lens Antennas

4. Microstrip Antenna.
Dielectric substrate
Antenna Patch
Ground plane
o In its most basic form, a Microstrip patch antenna consists of a radiating patch on
one side of a dielectric substrate which has a ground plane on the other side.

5. Basic Principles of Operation.
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The patch acts approximately as a resonant cavity (short circuit walls on
top and bottom, open-circuit walls on the sides).
If the antenna is excited at a resonant frequency, a strong field is set up
inside the cavity, and a strong current on the surface of the patch. This
produces significant radiation.

6. 
The radiating patch can be of any shape such as circular,
rectangular, triangular, sectoral , annular ring, semicircular .
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Low profile, conformable to various surfaces, inexpensive, durable,
but narrow-band.
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For good antenna performance, a thick dielectric substrate having a
low dielectric constant is desirable since this provides better
efficiency, larger bandwidth and better radiation .
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Micro strip patch antenna or patch antenna is a narrow band ,widebeam antenna.
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A thicker substrate will increase the radiation power , reduce
conductor loss and improve Band width.

7. Shapes of Microstrip Patch.

8. Feeding Techniques.
1.Microstrip Line Feed.
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A conducting strip is connected to the edge of
the patch. The feed can be etched on the
substrate.
2.Capacitive Feeding.
• In this type of feeding the feeding is
done to small aonther patch instead of
main radiating patch.

9. 3. Coaxial Feeding.
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The Coaxial feed or probe feed is a very common technique used for
feeding Microstrip patch antennas.
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The center conductor of the coaxial connecter is soldered to the patch.
Advantages:
1.Easy to fabricate and match.
2.Low spurious radiation.
 Disadvantages:
Narrow bandwidth
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10. Effects of Key Design Parameters
on Antenna Performance
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Air Gap
Separation Distance
Dimensions of Feed Strip
Probe Diameter
Size and properties of Dielectric substrate
Different Shapes of Radiator Patch

11. Advantages
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Low weight and small volume.
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Low fabrication cost
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Allows linear and circular polarization.
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Mechanically robust.
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Capable of dual and triple frequency operations.

12. Disadvantages
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Narrow bandwidth
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Lower gain
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Low power handling capacity.
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Spurious feed radiation.
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Low efficiency

13. Remedies
 Low power and low gain can overcome by arrays configuration.
 Surface wave associated limitations such as poor efficiency,
increased mutual coupling , reduced gain and radiation pattern can
overcome.
 The band width can increase up to 60% by using Bandwidth
Enhancement Techniques.

14. Dual Band Microstrip Antenna.
 In order to design a circular microstrip antenna for multiband
applications suitable dielectric substrate of relative permittivity
Єr=4.2 and thickness h=1.6mm is chosen.
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The circular microstrip antenna has radius=16.625mm.
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T-shaped slot with appropriate dimension is provided on the circular
patch to get dual band frequencies.
• The proposed antenna is probe fed and
antenna parameters like Return Loss,
VSWR and Radiation pattern at
corresponding resonance frequencies are
simulated on HFSS.

15. Return Loss.
• The simulation of the proposed antenna is done on HFSS software,
Simulation gives dual frequencies at 2.30 GHz and 5.8 GHz.
12

16. VSWR.
• VSWR stands for Voltage Standing Wave Ratio.

17. Radiation Pattern.

18. Applications.
 Used in Mobile Satellite Communication System.(2.3 GHz)
 Wire less LAN’S.(2.3 GHz)
 GPS system.(2.3 GHz)
 Can also be used for Radio Applications.(5.8 GHz)

19. References
[1]
G. Kumar and K. P. Ray, Broadband Microstrip Antennas, Artech House,
Norwood, Mass, USA, 2003
[2] C. A. Balanis, Antenna Theory, John Wiley & Sons, Hoboken, NJ, USA,
2nd edition, 2004.
[3]
R. Garg, P. Bhartia, I. Bahl, and A. Ittipiboon,Microstrip Antenna Design
Handbook, Artech House, Norwood, Mass, USA, 2001.
[4]
A Novel Dual Band Circular Microstrip Antenna , International Journal of
Computer Applications.
[5]