LAUSR

ABSTRACT We report a novel approach for the design of a Butler matrix-type feeding network that allows for achieving two-beam antenna arrays in a very broad frequency range. The proposed solution is based on a 2 × 4 frequency-selective beamforming network which changes its frequency characteristics across the bandwidth. The utilized network features three different properties at three different frequencies. Therefore, such a network allows for achieving two-beam radiation pattern with similar beamwidths and beam directions over 3:1 bandwidth in conjunction with four broadband radiating elements. The presented concept has been verified by the design and measurements of a two-beam antenna array operating in 1–3 GHz frequency range.