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In this paper, a new dual-band circularly polarized (CP) dielectric resonator antenna for WLAN and WiMAX applications is proposed. The dielectric resonator has an asymmetric Y-shaped geometry. By properly selecting the length of the arms, the pairs of fundamental (TE 111 ) and second-order (TE 211 ) are excited separately at the design frequencies to radiate the CP wave. The measurement shows that the fabricated antenna exhibits a wide impedance bandwidth for |S 11 | &lt; -10 dB of 62.07% (2.2-4.18 GHz). The far-field measurements in the broadside direction demonstrated a dual-band CP response with 3 dB ARBWs of 4.92%(2.38-2.5 GHz) at the lower and 12.64% (3.26-3.70 GHz) at the upper band. The measured CP bands cover the entire frequency range of WLAN (2.401-2.495 GHz) and WiMAX (3.4-3.69 GHz) at the lower and upper bands, respectively.

Dual-Band Circularly Polarized Dielectric Resonator Antenna for WLAN and WiMAX Applications