A Differentially Fed Dual-Polarized Slot Antenna With High Isolation and Low Profile for Base Station Application

摘要

In this letter, a low-profile differentially fed dual-polarized slot antenna is proposed for base station application. Its radiator is an octagon patch etched with two normal H-shaped slots. The folded feeding line is introduced to accommodate the differentially fed scheme and tune impedance matching. Both high isolation and stable radiation patterns are realized by using the differential feeding technique. Measured results demonstrate that the impedance bandwidths (VSWR < 1.5) of the two polarizations are 19.3% (3.14-3.81 GHz) and 20.3% (3.10-3.80 GHz), respectively. The proposed antenna has a high isolation of larger than 43 dB over the entire operation band. The measured gain is higher than 8.1 dBi within the operating frequency.