Abstract
A unique geometry of a square patch antenna with an embedded asymmetrical π-shaped slot for circular polarization is presented. The proposed structure has an aperture coupled feed which is matched over a very wide frequency band. This is accomplished by incorporating an oval shaped stub at the end of the single microstrip feed. The antenna shows a 3-dB axial ratio bandwidth of 3.9 % (2.50–2.60 GHz) with respect to the measured minimum axial ratio frequency of 2.56 GHz. The 10-dB return loss bandwidth measured is 40.23 % (2.32–3.35 GHz) with respect to 2.56 GHz. The antenna gain is >8.2 dBi in the circularly polarized band. The antenna is well suited for use in circularly polarized antennas and arrays for wireless communication.
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References
Garg, R., Bhartia, P., Bahl, I., & Ittipiboon, A. (2001). Microstrip antenna design handbook. Norwood, MA: Artech House.
Gupta, K. C., & Benalla, A. (1988). Microstrip antenna design. Norwood, MA: Artech House.
Targonski, S. D., & Pozar, D. M. (1993). Design of wideband circularly polarized aperture-coupled microstrip antennas. IEEE Transactions on Antennas and Propagation, 41(2), 214–220.
Karmakar, N. C., & Bialkowski, M. E. (1999). Circularly polarized aperture coupled circular microstrip patch antennas for L-band applications. IEEE Transactions on Antennas and Propagation, 47(5), 933–940.
Sharma, P. C., & Gupta, K. C. (1983). Analysis and optimized design of single feed circularly polarized microstrip antennas. IEEE Transactions on Antennas and Propagation, 31(6), 949–955.
Chen, W. S., Wong, K. L., & Wu, C. K. (2000). Inset microstripline-fed circularly polarized microstrip antennas. IEEE Transactions on Antennas and Propagation, 48(8), 1253–1254.
Ramirez, R. R., Flaviis, F. D., & Alexopoulos, N. G. (2000). Single-feed circularly polarized microstrip ring antenna and arrays. IEEE Transactions on Antennas and Propagation, 48(7), 1040–1047.
Chen, W. S., Wu, C. K., & Wong, K. L. (2001). Novel compact circularly polarized square microstrip antenna. IEEE Transactions on Antennas and Propagation, 49(3), 340–342.
Chang, F. S., Wong, K. L., & Chiou, T. W. (2003). Low-cost broadband circularly polarized patch antenna. IEEE Transactions on Antennas and Propagation, 51(10), 3006–3009.
Lu, J. H., Tang, C. L., & Wong, K. L. (1999). Single-feed slotted equilateral-triangular microstrip antenna for circular polarization. IEEE Transactions on Antennas and Propagation, 47(7), 1174–1178.
Tong, K. F., & Wong, T. P. (2007). Circularly polarized U-slot antenna. IEEE Transactions on Antennas and Propagation, 55(8), 2382–2385.
Nasimuddin., & Chen, Z. N. (2009). Aperture-coupled asymmetrical C-shaped slot microstrip antenna for circular polarization. IET Microwaves, Antennas and Propagation, 3(3), 372–378.
Nasimuddin., Qing, X., & Chen, Z. N. (2012). A compact circularly cross-shaped slotted microstrip antenna. IEEE Transactions on Antennas and Propagation, 60(3), 1584–1588.
Lin, Y. F., Lee, C. H., Pan, S. C., & Chen, H. M. (2013). Proximity-fed circularly polarized slotted patch antenna for RFID handheld reader. IEEE Transactions on Antennas and Propagation, 61(10), 5283–5286.
Gautam, A. K., Kunwar, A., & Kanaujia, B. K. (2014). Circularly polarized arrowhead-shape slotted microstrip antenna. IEEE Antennas and Wireless Propagation Letters, 13, 471–474.
IE3D Version 14.0. (2007) Zealand Software Inc: Fremont, CA.
HFSS Simulator ver 13.0, Ansoft: Canonsburg, PA.
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Sharma, A.K., Mittal, A. & Reddy, B.V.R. Asymmetrical π-Shaped Slot Embedded Microstrip Antenna for Circular Polarization. Wireless Pers Commun 83, 2069–2083 (2015). https://doi.org/10.1007/s11277-015-2503-2
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DOI: https://doi.org/10.1007/s11277-015-2503-2