A Circularly Polarized Dual-Axis Dual-Beam Array Antenna Employing a Dual-Feed Network with Diagonal 90° Phase Shift

Abstract

A 2 × 2 circularly polarized array antenna integrating a dual-feed network is proposed to provide a dual-beam radiation patterns for the wide-angle rectennas. The two diagonal antenna elements of the array antenna are quarter-wavelength ahead of another diagonal antenna elements. The planar magic-Ts are effectively used to obtain the desired radiation patterns with a simple structure. The design and performance of the array antenna is confirmed with experimental results and the proposed antenna have the same radiation patterns in the x-z and y-z planes. The measued gain of the proposed antenna is more than 9 dBic and 3-dB axial ratio bandwidth is 0.86%. The 10-dB impedance bandwidth of the antenna is better than 4.4%.