Compact Wideband Dual-polarized Antenna with High Isolation using Elliptical-shaped Gap Structure and Modified Y-shaped Feeding Baluns

Abstract

A compact (49 × 49 mm2) wideband dual-polarized antenna with high isolation (32 dB) using elliptical-shaped gap structure and modified Y-shaped feeding baluns is proposed in this paper. The gap structures between adjacent arms of dipoles are designed in elliptical shape to improve the impedance matching. The feeding baluns are modified into the same shape as the arms of dipoles to obtain high isolation. The proposed antenna realizes a wideband impedance bandwidth covering 1.7–2.7 GHz for S11 <−15 dB.