Dual-Circularly Polarized 60 GHz Beam-Steerable Antenna Array with 8 x 8 Butler Matrix

Abstract

A beam-steerable dual-circularly polarized 60 GHz antenna array is proposed. A 1 x 4 dual-fed stacked patch antenna array is integrated with an 8 x 8 Butler matrix. By utilizing the 8 x 8 Butler matrix, the proposed antenna array generates dual-circular polarization with beam-steering capability. The proposed antenna array system demonstrates good reflection coefficients in the frequency band ranging from 55.3 GHz to 64.9 GHz and has a mutual coupling of less than -10 dB over the frequency range of 57.5 GHz-63.2 GHz. At 60 GHz, the maximum gains and beam-steering angles for input ports 2, 4, 5, and 7 are 9.39 dBi at -38 degrees, 10.67 dBi at -11 degrees, 10.63 dBi at +11 degrees, and 9.38 dBi at +39 degrees, respectively. It is also demonstrated that the dual-polarization is well formed by switching the excitation ports. The right-handed circular polarization (RHCP) is formed when four ports from port 1 to port 4 are excited and left-handed circular polarization (LHCP) is formed when four ports from port 5 to port 8 are excited. The proposed antenna array system could be a good candidate for millimeter-wave 5G applications that require wide beam coverage and polarization diversity.