Wideband wide-beam high gain circularly polarized microstrip antenna array with artificial electromagnetic structure

Abstract

One microstrip antenna array with artificial electromagnetic structure to produce the wideband wide-beam and high-gain circularly polarized radiation characteristics is proposed in this paper. The antenna array is composed of multi-layers and fed through a 1-to-4 Wilkinson power divider phase shift network to generate a circularly polarized wave. Meanwhile, plated-through pins to the ground, connected by the square ring, are employed to achieve the wide beamwidth radiation. The antenna is designed to operate at around 12 GHz. It can achieve an impedance bandwidth (|S11|<−10 dB) of 10.8–13.4 GHz and a 3-dB AR bandwidth of 10.9–13.5 GHz. The antenna showed a right-hand circular polarization (RHCP) radiation with a wide half-power beamwidth (>100°), a wide 3-dB axial-ratio beamwidth (>90°) and a high radiation gain (>5dB) within the operational bandwidth.