Tri-band Dual-Polarized Omnidirectional Dielectric Resonator Antenna with a Planar Feed for Indoor Applications

A tri-band dual-polarized omnidirectional dielectric resonator antenna (DRA) with a planar feed is investigated. Both vertical and horizontal polarizations are obtained by using a novel feed network that has two sets of feeding circuits. The former polarization is obtained by using a circular patch with eight shorted stubs, each having a V-shaped open stub, whereas the latter is obtained by using two integrated loops. For demonstration, the tri-band dual-polarized DRA is designed in 2.4-, 5.2-, and 5.8-GHz bands for Wi-Fi applications, with polarization isolations of 16, 25, and 23 dB, respectively. The diameter and height of the antenna prototype are only 0.640 λ ₀ and 0.162 λ ₀ , respectively, where λ ₀ is the lowest operating wavelength in vacuum. DR TM modes, DR TE modes, DR-loaded planar monopole mode, and a loop mode are used in the design, and the details will be given in the paper.