A compact dual-circularly polarized cavity-backed ring-slot antenna

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Authors

Ferreira, Riaan
Joubert, Johan
Odendaal, J.W. (Johann Wilhelm)

Journal Title

Journal ISSN

Volume Title

Publisher

Institute of Electrical and Electronics Engineers

Abstract

A low profile dual-circularly polarized printed ring-slot antenna with a small footprint, which radiates above an open cavity loaded with an artificial magnetic conducting reflector, is presented. The feed network consists of two T-shaped capacitive feed structures connected to a miniaturized hybrid branch-line coupler. Experimental results for a final antenna design (with a size of 0.5λ0 × 0.5λ0 × 0.057λ0) show a 4% isolation bandwidth between the two ports of the dual-circularly polarized antenna and a maximum gain of approximately 6.8 dBic. Good front-to-back ratios and low cross-polarization were achieved. These very compact and low profile antennas are suitable for 2.4 GHz wireless local area network (WLAN) communication systems.

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Keywords

Cavity backed antennas, Circular polarization, Electromagnetic bandgap (EBG), Materials, Microstrip couplers, Slot antennas, Wireless local area network (WLAN)

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Citation

Ferreira, R, Joubert, J & Odendaal, JW 2017, 'A compact dual-circularly polarized cavity-backed ring-slot antenna', IEEE Transactions on Antennas and Propagation, vol. 65, no. 1, art# 7797250, pp. 364-368.