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A SINGLE-FEED DUAL-BAND DUAL-SENSE CIRCULARLY POLARIZED MICROSTRIP ANTENNA

By Q. Li, F.-S. Zhang, G. Zhang, B. Wang, and M. Liang

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Abstract:
A single-feed dual-band dual-sense circularly polarized (CP) microstrip antenna is proposed. The antenna consists of a circular radiating patch with a ring slot, two substrates with an air layer sandwiched between them and a capacitive coupling feed. The two resonant frequencies are controlled by the size of the circular radiating patch and the ring slot. By introducing the perturbation, the fundamental resonant mode splits into two orthogonal degenerate modes, and the CP radiation pattern is obtained. Capacitive disk coupling feed is also used in the design to enhance the band-width. The key parameters of the design are investigated to show how to obtain dual-band and dual-sense CP. The proposed antenna prototype is fabricated and measured. Experimental results show that good CP radiation performances are obtained at both resonant frequencies.

Citation:
Q. Li, F.-S. Zhang, G. Zhang, B. Wang, and M. Liang, "A Single-Feed Dual-Band Dual-Sense Circularly Polarized Microstrip Antenna," Progress In Electromagnetics Research C, Vol. 51, 27-33, 2014.
doi:10.2528/PIERC14051102

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