Dual‐band, dual‐polarized microstrip array for applications of WLAN base stations

Abstract

AbstractA dual‐band, dual‐polarized microstrip array with high isolation is presented. The array element is a compact ring patch antenna, and all of the radiating patches are fabricated on the same substrate. A horizontal coaxial balun is used to excite the compact element so that the isolation between two orthogonal polarizations and the coupling between two adjacent elements are reduced. A prototype of the proposed array is constructed. The measured results show that the prototype can be operated at two frequency bands, including 2.4 to 2.48 GHz and 5.15 to 5.875 GHz. Within the operation bandwidths, the array has a gain of about 12 dBi and a cross‐polarization level of less than −25 dB; in addition, the isolation levels between input ports are smaller than −35 dB.