The compact microstrip antenna is realized by placing the shorting plate or shorting post along the zero field line at the fundamental mode of conventional half wavelength microstrip antenna. The shorted plate microstrip antenna has higher bandwidth as compared to the conventional microstrip patch. The bandwidth of microstrip antenna is increased by using proximity feeding technique. In this paper the broadband proximity fed configurations of shorted plate rectangular microstrip antennas are discussed. They give bandwidth of more than 350 MHz. Further a pair of rectangular slots cut broadband shorted plate proximity fed rectangular microstrip antenna is proposed. The proposed configuration gives a bandwidth of nearly 480 MHz with a gain of more than 5 dBi over the VSWR bandwidth. Since the shorted patch is used, the antenna shows maximum in the radiation pattern in the end-fire direction.

1. Kumar, G., and Ray, K. P. 2003. Broadband Microstrip Antennas, Artech House, USA
2. Garg, R., Bhartia, P., Bahl, I., and Ittipiboon, A. 2001. Microstrip Antenna Design Handbook, Artech House, USA
3. Bhartia B., and Bahl, I. J. 1980. Microstrip Antennas, USA
4. Cock, R. T., and Christodoulou, C. G. 1987. Design of a two layer capacitively coupled microstrip patch antenna element for broadband applications. In the Proceedings of IEEE Antennas Propag. Soc. Int. Symp. Dig., 2, 936-939.
5. Deshmukh, A. A., and Ray, K. P. 2010. Proximity fed Broadband Rectangular Microstrip Antennas, In the Proceedings of ISM – 2010, Banglore, India
6. Deshmukh, A. A., and Kumar, G. 2005. Compact Broadband gap-coupled Shorted L-shaped Microstrip Antennas. Microwave and Optical Technology Letters. 47. 6. (20th Dec. 2005), 599 – 605.
7. Deshmukh, A. A., and Kumar, G. 2006. Compact Broadband stacked Microstrip Antennas. Microwave and Optical Technology Letters. 48. 1. (Jan. 2006). 93 – 96.
8. Wong, K. L. 2002. Compact and Broadband Microstrip Antennas, John Wiley & sons, Inc., New York, USA
9. Huynh, T., and Lee, K. F. 1995. Single-Layer Single-Patch Wideband Microstrip Antenna. Electronics Letters. 31. 16 (August 1995), 1310-1312.
10. Wong, K. L., and Hsu, W. H. 2001. A Broadband Rectangular Patch Antenna with a Pair of wide slits. IEEE Transactions on Antennas & Propagation. 49. (2001). 1345 – 1347.
11. Deshmukh, A. A., and Ray, K. P. 2010. Broadband Reactively coupled E-shaped Microstrip Antennas. In the Proceedings of NCC – 2010, January 29th – 31st, IIT Madras, India
12. IE3D 12.1, Zeland Software, Freemont, USA
13. Balanis, C. A. Antenna Theory: analysis and design. 2nd edition, John Wiley & Sons Ltd.

Rectangular microstrip antenna Broad band microstrip antenna shorted plate microstrip antenna pair of rectangular slots