volume | PIER Journals

Abstract

In this paper, we propose a circularly polarized (CP) stacked annular-ring microstrip antenna (SARMSA) with an integrated feeding network in the UHF RFID band. A circular parasitic patch is suspended above the annular ring to improve the impedance matching and bandwidth. Through the parametric studies on SARMSA, the CP characters of the entire antenna are well understood，and an optimized CP character is obtained. Prototypes are fabricated to confirm the theoretical results. The experimental results indicate the impedance bandwidth for S₁₁<-10 dB is 870-967 MHz (10.6% at 915 MHz)，and the 3 dB AR bandwidth is 893-948 MHz (6%). Meanwhile, the measured CP gain reaches 8.9 dBic at 915 MHz.

1. Kasabegoudar, V. G. and K. J. Vinoy, "A broadband suspended microstrip antenna for circular polarization," Progress In Electromagnetics Research, Vol. 90, 353-368, 2009.
doi:10.2528/PIER09012901

2. Yang, S. L. S., K. F. Lee, and A. A. Kishk, "Design and study of wideband single feed circularly polarized microstrip antennas," Progress In Electromagnetics Research, Vol. 80, 45-61, 2008.
doi:10.2528/PIER07110604

3. Chen, H. M. and K. L. Wong, "On the circular polarization operation of annular-ring microstrip antennas," IEEE Trans. Antennas Propag., Vol. 47, No. 8, 1289-1292, 1999.
doi:10.1109/8.791945

4. Lin, Y. F., H. M. Chen, and S. C. Lin, "A new coupling mechanism for circularly polarized annular-ring patch antenna," IEEE Trans. Antennas Propag., Vol. 56, No. 1, 11-16, 2008.
doi:10.1109/TAP.2007.912961

5. Row, J. S., "Design of aperture-coupled annular-ring microstrip antennas for circular polarization," IEEE Trans. Antennas Propag., Vol. 53, No. 5, 1779-1784, 2005.
doi:10.1109/TAP.2005.846809

6. Tong, K. F. and J. J. Huang, "New proximity coupled feeding method for reconfigurable circularly polarized microstrip ring antennas," IEEE Trans. Antennas Propag., Vol. 56, No. 7, 1860-1866, 2008.
doi:10.1109/TAP.2008.924736

7. Guo, Y. X., L. Bian, and X. Q. Shi, "Broadband circularly polarized annular-ring microstrip antenna," IEEE Trans. Antennas Propag., Vol. 57, No. 8, 2474-2477, 2009.
doi:10.1109/TAP.2009.2024584

8. Ridgers, G. M., J. W. Odendaal, and J. Joubert, "New feeding mechanism for annular-ring microstrip antenna," Electron. Lett., Vol. 36, No. 7, 605-606, 2000.
doi:10.1049/el:20000539

9. Latif, S. I. and L. Shafai, "Polarization characteristic of multiband loaded microstrip annular ring antennas," IEEE Trans. Antennas Propag., Vol. 57, No. 7, 2788-2793, 2009.
doi:10.1109/TAP.2009.2027354

10. Al-Charchafchi, S. H., W. K.Wan Ali, and S. Sinkeree, "A stacked annular-ring microstrip patch antenna," IEEE APS International Symposium Digest, Vol. 2, 948-951, 1997.
doi:10.1109/APS.1997.631684

11. Ohmine, H., Y. Sunahara, and M. Matsunaga, "An annular-ring microstrip antenna fed by a co-planar feed circuit for mobile satellite communication use," IEEE Trans. Antennas Propag., Vol. 45, No. 6, 1001-1008, 1997.
doi:10.1109/8.585748

12. Wu, Y. S. and F. J. Rosenbaum, "Mode chart for microstrip ring resonators," IEEE Trans. Microwave Theory Tech., Vol. 21, 487-489, 1973.
doi:10.1109/TMTT.1973.1128039

13. Liu, H. and X. F. Hu, "Input impedance analysis of a microstrip annular-ring antenna with a thick substrate," Progress In Electromagnetics Research, Vol. 12, 177-204, 1996.

14. Chew, W. C., "A broad-band annular-ring microstrip antenna," IEEE Trans. Antennas Propag., Vol. 30, No. 5, 918-922, 1982.
doi:10.1109/TAP.1982.1142913

15. Lee, K. F. and J. S. Dahele, "Theory and experiment on the annular-ring microstrip antenna," Annals of Telecommunications, Vol. 40, 508-515, 1985.

16. Dahele, J. S., K. F. Lee, and D. P.Wong, "Dual-frequency stacked annular-ring microstrip antenna," IEEE Trans. Antennas Propag., Vol. 35, No. 11, 1281-1285, 1987.
doi:10.1109/TAP.1987.1143997

17. Lo, Y. T. and S. W. Lee, Antenna Handbook, Chapman and Hall, New York, NY, 1993.

Dr. Xi Chen

Dr. Guang Fu

Prof. Shu-Xi Gong

Dr. Ya-Li Yan

Dr. Jin Chen