Compact dual-band circularly-polarized frequency reconfigurable microstrip antenna for BeiDou navigation satellite system application

Abstract

A novel dual-band circularly-polarized frequency reconfigurable microstrip antenna with the feasibility of obtaining a relatively smaller size is proposed and demonstrated. Fed by a Wilkinson power divider with 90° phase difference, the proposed circularly-polarized frequency reconfigurable patch antenna, consisting of a patch radiator etched with a square-ring slot and a double-sided printed DC bias circuit, is designed, analyzed and fabricated. Good agreement between simulated and measured results is observed. Simulation and measurement results reveal that the proposed dual-band circularly polarized (CP) antenna for BeiDou navigation satellite system can provide impedance bandwidths of 4.1% (1.592-1.658 GHz) and 5.5% (2.43-2.568 GHz) for lower L band and upper S band respectively, as well as 3-dB axial ratio (AR) bandwidths of 1.5% (1.602-1.626 GHz) and 1.7% (2.465-2.507 GHz) for LHCP and RHCP respectively. Meanwhile, within the effective LHCP/RHCP bandwidths, the proposed antenna has gains from 3.6 dBic to 4.2 dBic with an average gain of 4.0 dBic for LHCP, and gains from 3.3 dBic to 3.6 dBic with an average gain of 3.4 dBic for RHCP, respectively.

A wideband dual-polarized crossed antenna with low profile and enhanced gain performance

“…In references [11,12,13,14], many Vivaldi antennas have improved their gain, bandwidth, compact profile, and other characteristics by loading periodic slots, dielectric lens, patch in between two fares of the antenna. Of course, micro-strip antennas are also choices due to low-profile, low cost, and easy-to-integrate properties [15,16,17]. However, the only broadband characteristics cannot meet the increasingly high channel capacity requirements of modern communication systems.…”