A low profile dual-circularly polarized printed ring-slotantenna with a small footprint, which radiates above an open cavityloaded with an artificial magnetic conducting reflector, is presented.The feed network consists of two T-shaped capacitive feed structuresconnected to a miniaturized hybrid branch-line coupler. Experimentalresults 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 thedual-circularly polarized antenna and a maximum gain of approximately6.8 dBic. Good front-to-back ratios and low cross-polarization wereachieved. These very compact and low profile antennas are suitablefor 2.4 GHz wireless local area network (WLAN) communication systems.
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