Dual-Band and Wideband Dual-Polarized Cylindrical Dielectric Resonator Antennas

This letter investigates dual-band and wideband designs of dual-polarized cylindrical dielectric resonator antennas (DRAs). These designs make use of the fundamental ${\rm HEM}_{111}$ mode and higher-order ${\rm HEM}_{113}$ mode of the DRA. The strip- and slot-fed excitation methods are used for Ports 1 and 2 of the antennas, respectively. For demonstration, a dual-band dual-polarized DRA for DCS (1.71–1.88 GHz) and WLAN (2.4–2.48 GHz) bands and a wideband version that covers the 2.4-GHz WLAN band were designed. The $S$ -parameters, radiation patterns, antenna gains, antenna efficiencies, and envelope correlations of the two designs are studied. It was found that the dual-band and wideband designs have port isolations of higher than 36 and 37 dB, respectively. Good agreement between the measured and simulated results is observed.