ƒA novel compact circularly polarized microstrip antenna (CPMA) with bandwidth enhancement is proposed and studied. By employing capacitive loading and inductive loading, the size miniaturization is achieved. The cross-shaped aperture in the ground plane is able to excite two orthogonal modes. The near-equal amplitudes and 90° phase difference between these two modes are realized by properly designing the feed network, i.e., a 0°-90° hybrid comprising a 3-dB Wilkinson power divider cascaded with a 90° phase shifter. The proposed antenna exhibits a global bandwidth of 11.5% ranging from 1.88 GHz to 2.11 GHz with an overall size 50 mm × 50 mm × 6.8 mm (0.33λ0 × 0.33λ0 × 0.045λ0). The global bandwidth is defined where return loss is larger than 10 dB, broadside axial ratio (AR) smaller than 3 dB, and gain above 0 dBic.
2. James, J. R., P. S. Hall, and C. Wood, Microstrip Antenna Theory and Design, Peter Peregrinus, London, U.K., 1981.
doi:10.1049/PBEW012E
3. Carver, K. R. and J. W. Mink, "Microstrip antenna technology," IEEE Trans. Antennas Propag., Vol. 29, No. 1, 2-24, 1981.
doi:10.1109/TAP.1981.1142523
4. Pozar, D. M., "Microstrip antennas," Proceedings of the IEEE, Vol. 80, No. 1, 79-91, 1992.
doi:10.1109/5.119568
5. Targonski, S. D. and D. M. Pozar, "Design of wide-band circularly polarized aperture coupled microstrip antenna," IEEE Trans. Antennas Propag., Vol. 41, No. 2, 214-220, 1993.
doi:10.1109/8.214613
6. Gardiol, F. E. and J. F. Zuercher, "Broad-band patch antennas — A SSFIP update," IEEE AP-S Int. Symp. Dig., 2-5, 1996.
7. Aksun, M. I., S. L. Chuang, and Y. T. Lo, "On slot-coupled microstrip antennas and their applications to CP operation — Theory and experiment," IEEE Trans. Antennas Propag., Vol. 38, No. 8, 1224-1230, 1990.
doi:10.1109/8.56958
8. Oliver, M. B., Y. M. M. Antar, R. K. Mongia, and A. Ittipiboon, "Circularly polarized rectangular dielectric resonator antenna," Electron. Lett., Vol. 31, No. 6, 418-419, 1995.
doi:10.1049/el:19950304
9. Esselle, K. P., "Circularly polarized higher-order rectangular dielectric resonator antenna," Electron. Lett., Vol. 32, No. 3, 150-151, 1996.
doi:10.1049/el:19960171
10. Li, J. X., J. Y. Guo, A. X. Zhang, W. T. Joines, and Q. H. Liu, "Miniaturized single-feed cross-aperture coupled circularly polarized microstrip patch antenna," Progress In Electromagnetics Research C, Vol. 63, 183-191, 2016.
doi:10.2528/PIERC16031301
11. Vlasits, T., E. Korolkiewicz, A. Sambell, and B. Robinson, "Performance of a cross-aperture coupled single feed circularly polarized patch antenna," Electron. Lett., Vol. 32, No. 7, 612-613, 1996.
doi:10.1049/el:19960459
12. Huang, C. Y., J. Y. Wu, and K. L. Wong, "Cross-slot-coupled microstrip antenna and dielectric resonator antenna for circular polarization," IEEE Trans. Antennas Propag., Vol. 47, No. 4, 605-609, 1999.
doi:10.1109/8.768798
13. Wong, K. L. and T. W. Chiou, "Broad-band single-patch circularly polarized microstrip antenna with dual capacitively coupled feeds," IEEE Trans. Antennas Propag., Vol. 49, No. 1, 41-44, 2001.
doi:10.1109/8.910527
14. James, J. R. and P. S. Hall, Handbook of Microstrip Antennas, Peter Peregrinus, London, U.K., 1989.
15. Lu, J. H. and C. L. Tang, "Circular polarization design of a single-feed equilateral-triangular microstrip antenna," Electron. Lett., Vol. 34, No. 4, 319-321, 1998.
doi:10.1049/el:19980232
16. Wong, K. L. and J. Y. Wu, "Single-feed small circularly polarized square microstrip antenna," Electron. Lett., Vol. 33, 1833-1834, 1997.
doi:10.1049/el:19971299
17. Yang, M., Z. N. Chen, P. Y. Lau, X. Qing, and X. Yin, "Miniaturized patch antenna with grounded strips," IEEE Trans. Antennas Propag., Vol. 63, No. 2, 843-848, 2015.
doi:10.1109/TAP.2014.2382668
Submit
