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A circularly polarized (CP) stack antenna with tri-band operation is presented. The proposed antenna has a square loop resonator with the perturbation to present dual-mode effects, and it is excited by a strip with the tuning stub through the coupling of an aperture in the ground plane. The ability to enhance the bandwidth and reconfigure the CP performances is achieved by the perturbation and the...
The authors propose a compact single-feed stack antenna consisting of a square loop radiator with perturbation, an aperture-coupled structure, and a straight-strip feed line for circular polarization (CP) and unidirectional radiation applications. This perturbation applies both dual-mode and orthogonal-mode effects simultaneously in the square loop resonator to present bandwidth and CP characteristics...
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