Circularly polarized beam steering array antenna fed by low magnitude and phase error response of Butler matrix to use pattern stabilization applications

Abstract

In this work, a novel circularly polarized (CP) Fabry–Perot resonator beam-steering antenna array with capability covering C-band applications is introduced. The proposed antenna array caters to a relatively constant high gain at a broadband impedance bandwidth in comparison with conventional arrays. The presented antenna is designed based on a broadband Butler matrix feeding network which is able to stabilize direction patterns at different frequencies for each of the ports for the sake of phase distribution in whole operation frequency with low phase error.