1. MVSR Engineering College
Presented by
Omprakash (2451-12-735-302)

2. Contents
 Objective
 Existing designs
 Design tools
 Antenna design
 Studies of antenna
 Current distribution and Radiation patterns
 Conclusion
 References

3. Objective
The design of a Multi-band slot antenna provides usage of
1. Global-Positioning-System (GPS)
2. Worldwide Interoperability for Microwave Access (WI-MAX)
3. Wireless-Area-Network (WLAN) is presented.
 GPS is a space based navigation system that provides location and
information in all weather conditions. It’s frequency lies at 1.575GHz
 WI-MAX is a family of wireless communications standards initially
designed to provide 30 to 40 megabit-per-second data rates.
 WLAN is a wireless computer network that links two or more devices
using a wireless distribution method within a limited area such as a home,
school, computer laboratory or office building.

4. Existing Designs
Types of Multi-band slot antennas
1. Dual band slot antenna
2. Tri-band antenna
 Dual-band slot antennas and Tri-band slot antennas were compact in size but
their radiation slot is small.
 To overcome this limitation Four-band slot antenna was proposed by using
several stubs on the ultra wideband slot radiator.

5. Design Tools
 Multi-band antenna is studied and designed using the EM simulation tool
HFSS(High frequency structure simulator )
 For verification of simulation results, the antenna is fabricated and measured using
the antenna measurement equipment, Satimo Starlab system.

6. Antenna Design
 Multi-band slot antenna consists of a rectangular slot with a size of L1×W1
= 48×18 sq.mm on one side of the substrate.
 The rectangular slot is loaded with an inverted T-shaped stub at the upper
edge of the rectangular slot and two E-shaped stubs on the left-hand (LH)
and right-hand (RH) sides of the slot

7.  The T-shaped feed patch

9. Tuning Range

10. STUDIES OF ANTENNA
The effects of different radiating elements on the frequency bands of the proposed
multi-band antenna, computer simulation on S11 is carried out in four conditions
1) Only the T-shaped feed patch
2) Only the T-shaped feed patch and the inverted T-shaped stub
3) Only the T-shaped feed patch and the two E-shaped stubs
4) The completed design (proposed antenna).
 When only the T-shaped feed patch is used in the slot, the antenna generates three frequency
bands, bands 1, 3 and 4, at about 1.8, 3.5 and 5.2 GHz, respectively.
 When the inverted T-shaped stub is added, band 1 is moved slightly down from 1.8 to 1.575 GHz,
yet bands 3 and 4 remaining about the same.

11.  When all the elements are used, the proposed multi-band antenna has four frequency bands
1) 1.522-1.588 GHz for the GPS system,
2) 2.368-2.56 GHz for the IEEE 802.11b & g WLAN systems,
3) 3.19-3.832 GHz for the WIMAX system
4) 4.96-5.94 GHz for the IEEE 802.11a WLAN system can be obtained

13. Antenna with Radiation area

14.  computer simulation has been used to study the effects of different parameters on
the four frequency bands
1.00 2.00 3.00 4.00 5.00 6.00 7.00
Freq [GHz]
-25.00
-20.00
-15.00
-10.00
-5.00
0.00
dB(S(1,1))
HFSSDesign1XY Plot 2 ANSOFT
Curve Info
dB(S(1,1))
Setup1 : Sweep

15. Current distributions and radiation patterns
Fig. 7 Simulated and measured radiation patterns at (a) 1.575 GHz, (b) 2.45
GHz, (c) 3.5 GHz, and (d) 5.2 (Simulation without cable model ,
measurement , and simulation with cable model )
Fig. 5 Simulated cur rent distributions at (a) 1.575 GHz, (b) 2.45 GHz, (c) 3.5
GHz, (d) 5.2 GHz

16. 3D Radiation Patterns

17. Conclusion
 Successfully designed a planar four-band slot antenna for GPS/WIMAX/WLAN.

18. References
 X. L. Sun, S. W. Cheung, and T. I. Yuk, “Dual-band monopole antenna with frequency tunable feature for
WiMAX applications,” IEEE Antennas Wireless Propag. Lett., vol. 12, pp.100-103, 2013.
 Y. D. Dong, H. Toyao, and T. Itoh, “Design and characterization of miniaturized patch antennas loaded with
complementary split-ring resonators,” IEEE Trans. Antennas Propag., vol. 60, no. 2, pp. 772-785, Feb. 2012.
 S. W. Su, “High-gain dual-loop antennas for MIMO access points in the 2.4/5.2/5.8 GHz bands,” IEEE Trans.
Antennas Propag., vol. 58, no. 7, pp. 2412-2419, Jul. 2010.
 K. L. Wong, and L. C. Lee, “Multiband printed monopole slot antenna for WWAN operation in the laptop
computer,” IEEE Trans. Antennas Propag., vol. 57, no. 2, pp. 324-330, Feb. 2009.
 J. H. Lu and B. J. Huang, “Planar compact slot antenna with multi-band operation for IEEE 802.16m
application,” IEEE Trans. Antennas Propag., vol. 61, no. 3, pp. 1411-1414, Mar. 2013.

19. THANK YOU