volume | PIER Journals

Abstract

A theoretical analysis of a gap-coupled stacked annular ringmicrostrip antenna with superstrate is performed in order to obtain wider bandwidth operation. The effects of air gap, superstrate thickness and feedingp oint location on the antenna performance are analyzed in TM₁₁ mode usingequiv alent circuit concept. It is noted that the proposed antenna is very sensitive to the feedingp oint location in TM₁₁ mode while annular ringmicrostrip patch antenna is independent of feed point in that mode. The optimized proposed antenna shows an impedance bandwidth of 13.96% whereas the antenna without air-gap has 8.75% bandwidth and without superstrate it has bandwidth of 10.89%. The theoretical results are compared with simulated and experimental results.

1. Dahele, J. S. and K. F. Lee, "Characteristics of annular ring microstrip antenna," Electronics Letters, Vol. 18, No. 24, 1051-1052, November 1982.
doi:10.1049/el:19820718 Google Scholar

2. Liu, H. and X. F. Hu, "Input impedance analysis of microstrip annular ringan tenna with thick substrate," Progress In Electromagnetics Research, Vol. 12, 177-204, 1996. Google Scholar

3. Lee, K. F. and J. S. Dahele, "Two layered annular ring microstrip antenna," International Journal of Electronics, Vol. 61, No. 2, 207-217, 1986.
doi:10.1080/00207218608920860 Google Scholar

4. Fan, Z. and K. F. Lee, "Input impedance annular ring microstrip antennas with dielectric cover," IEEE Trans. Antenna Propagat., Vol. 40, No. 8, 992-995, August 1992.
doi:10.1109/8.163440 Google Scholar

5. Al-Charchafchi, S. H., W. K. W. Ali, and S. Sinkeree, "A stacked annular ring microstrip patch antenna," IEEE Antenna Propag. Society Int. Symp., Vol. 2, 948-951, July 1997. Google Scholar

6. Misra, S. and S. K. Chowdhury, "Concentric microstrip ring antenna: Theory and experiment," Journal of Electromagnetic Waves and Applications, Vol. 10, No. 3, 439-450, 1996.
doi:10.1163/156939396X00513 Google Scholar

7. Garcia, Q. G., "Broadband attacked annular ring," IEE Antenna and Propogation Conference, No. 407, 508-512, April 1995.

8. Ansari, J. A., R. B. Ram, S. K. Dubey, and P. Singh, "A frequency agile stacked annular ring microstrip antenna using a Gunn diode," Smart Materials and Structures, Vol. 16, 2040-2045, 2007.
doi:10.1088/0964-1726/16/6/006 Google Scholar

9. Liu, Z. F., P. S. Kooi, L. W. Li, M. S. Leong, and T. S. Yeo, "A method for designing broad-band microstrip antennas in multilayered planar structures," IEEE Trans. Antenna Propagat., Vol. 47, No. 9, 1416-1420, September 1999.
doi:10.1109/8.793321 Google Scholar

10. Garg, R., P. Bhartia, I. Bahl, and A. Ittipiboon, Microstrip Antenna Design Handbook, Artech House, 2001.

11. Derneryd, A. G., "Analysis of the microstrip disc antenna element," IEEE Trans. Antenna Propagat., Vol. 27, No. 5, 660-664, 1979.
doi:10.1109/TAP.1979.1142159 Google Scholar

12. Bahl, I. J. and P. Bhartia, Microstrip Antenna, Artech House, 1980.

13. Lee, K. F. and J. S. Dahele, "Theory and experiment on the annular ringmicrostrip antenna," Ann. Telecomm., Vol. 40, No. 9, 508-515, 1985. Google Scholar

Prof. Jamshed Ansari

Dr. Ram Ram

Dr. Prabhakar Singh