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DUAL-BAND OMNIDIRECTIONAL CIRCULARLY POLARIZED PATCH ANTENNA WITH ETCHED SLOTS AND SHORTING VIAS

By H.-Y. Zhang, F.-S. Zhang, C. Wang, and T. Li

Full Article PDF (1,953 KB)

Abstract:
A dual-band omnidirectional circularly polarized (CP) patch antenna with conical radiation patterns is presented in this paper. The antenna consists of a patch with inclined slots, a ground plane with L-shaped slots and a coaxial probe. In addition, by loading shorting vias between the patch and the ground plane, the vertical polarizations of the proposed antenna at TM01 and TM02 modes can be obtained. Two sets of slots etched on the ground and the patch contribute to the horizontal polarizations for the two modes, respectively. Omnidirectional CP fields can be achieved at both resonant modes when the two orthogonal polarizations are equal in amplitude and different in phase by 90°. To verify the design, a prototype operating at 2.4 GHz WLAN and 3.5 GHz WiMAX bands has been fabricated and measured. The measured average axial ratios (ARs) at two resonant modes in the azimuth plane are 1.1 and 1.5 dB, respectively. Experimental results show good agreement with the simulated data.

Citation:
H.-Y. Zhang, F.-S. Zhang, C. Wang, and T. Li, "Dual-Band Omnidirectional Circularly Polarized Patch Antenna with Etched Slots and Shorting Vias," Progress In Electromagnetics Research C, Vol. 73, 167-176, 2017.
doi:10.2528/PIERC17021402

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