Ferreira, RiaanJoubert, JohanOdendaal, J.W. (Johann Wilhelm)2017-02-092017-02-092017-01Ferreira, 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. 364-368.0018-926X10.1109/TAP.2016.2623654http://hdl.handle.net/2263/58949A 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.en© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists of any copyrighted components of this work in other works.Cavity backed antennasCircular polarizationElectromagnetic bandgap (EBG)MaterialsMicrostrip couplersSlot antennasWireless local area network (WLAN)Postprint Article