An Investigation of Shorting Pin Effects on Circular Disc Microstrip Antennas

Abstract

In this study, shorting pin addition, one of the common bandwidth enhancement techniques, is performed on traditional circular disc microstrip antennas that have three different dielectric substrate thicknesses and designed in three different resonant frequencies. Numbers of added shorting pins and positions of these pins are changed in every step, systematically and different pin combinations are tried for three antennas that design parameters are present in literature. Later, optimal pin combinations that give the intended resonant frequencies and the largest bandwidths are determined.  For these optimal combinations, by keeping the resonant frequencies constant, the bandwidths of the antennas are increased to %1.440, %2.780 and % 6.024, respectively. Compared to measurement results in the literature, for bandwidths, significant improvements are obtained. At the same time, it is observed that the technique of shorting pin addition increases the bandwidths in higher percentages on thicker microstrip antennas. For three antennas, it is seen that all pin combinations give similar resonant frequency variations depended on pin positions. 

Keywords

• Circular microstrip antenna; shorting pin; bandwidth enhancement; HFSS simulation; optimization

Original Research Paper

Öz

References

1. Bahl I. J. and BhartiaP.MicrostripAntennas. Artech House, 1980, ch. 3.
2. Dahele J.S., and Lee K.F.Effect of Substrate Thickness on the Performance of a Circular-Disk Microstrip Antenna, IEEE Transactions on Antennas and Propagation, Vol. AP-31, No. 2, , pp:358-360, March 1983.
3. Kumar G. and Ray K.P. Broadband Microstrip Antennas, Artech House, Boston, London, 2003.
4. Koçer D. Simulation of Circular and Rectangular Microstrip Antennas and Determination of Their Resonant Frequencies by Artificial Neural Networks, M.S. Thesis, Dept. Elect. and Electro. Eng., Graduate School of Natural Sciences, Selcuk University, Konya, Turkey, 2009.
5. Uzer D. Investigation on Favourable Methods for Wideband Microstrip Patch Antenna Designs, PhD. Thesis, Dept. Elect. and Electro. Eng., Graduate School of Natural Sciences, Selcuk University, Konya, Turkey, (continuing).
6. Wong K.L. Compact and Broadband Microstrip Antennas, Wiley Inc. 2002.
7. WongK. L., Tang C. L., and Chen H. T.A Compact Meandered Circular Microstrip Antenna with a Shorting Pin, Microwave Opt. Technol. Lett. 15, 147–149, June 20, 1997.
8. Dey S. and Mittra R. Compact Microstrip Patch Antenna, Microwave Opt. Technol. Lett. 13, 12–14, Sept. 1996.

9. Sharma A. and Singh G. Design of Single Pin Shorted Three-Dielectric-Layered Substrates Rectangular Patch Microstrip Antenna for Communication Systems, Progress In Electromagnetics Research Letters, Vol. 2, 157–165, 2008.
10. -
11. Information and Communication Technologies, 2010 ICT India September, Proceedings, Springer.
12. Wong K. L. andW. Chen S. Compact Microstrip Antenna with Dual-Frequency Operation, Electron. Lett. 33, 646–647, April 10, 1997.
13. HFSS v14, www.ansys.com/HFSS