volume | PIER Journals

Abstract

This paper presents a simple broadband proximity- coupled microstrip patch antenna. A circular patch is used as the main radiator, and an H-shaped shot is cut in the ground plane below the feed line. A stepped-width microstrip line is used to feed the patch through proximity coupling. By using a single patch, the prototype antenna achieves an impedance bandwidth of 26%. Low cross-polar levels below -20 dB are observed in both E- and H -planes. The broadband antenna is planar, small size, simple in structure, low in cost, and easy to be fabricated, thus attractive for practical applications.

1. Pues, H. F. and A. R. Van de Capelle, "An impedance matching technique for increasing the bandwidth of microstrip antennas," IEEE Trans. Antennas Propagat., Vol. 37, 1345-1354, 1989.
doi:10.1109/8.43553

2. Pozar, D. M. and B. Kaufman, "Increasing the bandwidth of a microstrip antenna by proximity coupling," Electron. Lett., Vol. 23, No. 8, 368-369, 1987.

3. Lee, R. Q., K. F. Lee, and J. Bobinchak, "Characteristics of a two-layer electromagnetically coupled rectangular patch antenna," Electron. Lett., Vol. 23, No. 20, 1070-1071, 1987.

4. Targonski, S. D., R. B. Waterhouse, and D. M. Pozar, "Design of wideband aperture-stacked patch antennas," IEEE Trans. Antennas Propagat., Vol. 46, 1245-1251, 1998.
doi:10.1109/8.719966

5. Gao, S., L. W. Li, P. Gardner, and P. S. Hall, "Dual-polarized wideband microstrip antenna," Electron. Lett., Vol. 37, No. 18, 1106-1107, 2001.
doi:10.1049/el:20010760

6. Gupta, K. C. and A. Benalla (eds.), Microstrip Antenna Design, Artech House, 1988.

7. James, J. R. and P. S. Hall (eds.), Handbook of Microstrip Antennas, Peter Peregrinus, 1989.

8. Pozar, D. M. and D.H. Schaubert (eds.), Microstrip Antennas, the Analysis and Design of Microstrip Antennas and Arrays, 1995.

9. Zucher, J. F. and F. E. Gardiol, Broadband Patch Antennas, Artech House, 1995.

10. Huynh, T. and K. F. Lee, "Single-layer single-patch wideband microstrip antenna," Electron. Lett., Vol. 31, No. 16, 1310-1312, 1995.
doi:10.1049/el:19950950

11. Wong, K. L. and Y. F. Lin, "Small broadband rectangular microstrip antenna with chip-resistor loading," Electron. Lett., Vol. 33, No. 19, 1593-1594, 1997.
doi:10.1049/el:19971111

12. Gonzalez de Aza, M. A., J. Zapata, and J. A. Encinar, "Broadband cavity-backed and capacitively probe-fed microstrip patch arrays," IEEE Trans. Antennas Propagat., Vol. 48, 784-789, 2001.
doi:10.1109/8.855498

13. Guo, Y. X., K. M. Luk, and K. F. Lee, "L-probe proximity- fed annual ring microstrip antenna," IEEE Trans. Antennas Propagat., Vol. 49, 19-21, 2001.
doi:10.1109/8.910524

14. Guo, Y. X., C. L. Mak, K. M. Luk, and K. F. Lee, "Analysis and design of L-probe proximity fed patch antenna," IEEE Trans. 130 Gao and Sambell Antennas Propagat., Vol. 49, 145-149, 2001.
doi:10.1109/8.914252

15. Luk, K. M., Y. X. Guo, K. F. Lee, and Y. L. Chow, "L-probe proximity fed U-slot patch antenna," Electron. Lett., Vol. 34, No. 19, 1806-1807, 1998.
doi:10.1049/el:19981276

16. Herscovici, N., "New considerations in the design of microstrip antennas," IEEE Trans. Antennas Propagat., Vol. 46, 807-812, 1998.
doi:10.1109/8.686766

17. Ke, S. Y., "Broadband proximity-coupled microstrip antennas with an H-shaped slot in the ground plane," IEEE Antennas and Propagation Symp. Dig., 530-533.

18. Pozar, D. M. and S. D. Targonski, "Improved coupling for aperture-coupled microstrip antennas," Electron. Lett., Vol. 27, No. 13, 1129-1131, 1991.

19. Rathi, V., G. Kumar, and K. P. Ray, "Improved coupling for aperture-coupled microstrip antennas," IEEE Trans., Vol. AP-44, No. 8, 1196-1198, 1996.

Dr. Steven Gao

Dr. A. Sambell