A 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 lambda(0) and 0.162 lambda(0), respectively, where lambda(0) is the lowest operating wavelength in vacuum. Dielectric resonator (DR) TM modes, DR TE modes, a DR-loaded planar monopole mode, and a loop mode are used in the design, and the details will be given in this article.