NOVEL APERTURE-COUPLED MICROSTRIP-LINE FEED FOR CIRCULARLY POLARIZED PATCH ANTENNA

Abstract

A wideband circularly polarized patch antenna is proposed.The wide impedance and axial ratio bandwidths are achieved by the proposed feeding mechanism, which entails the use of a circular microstrip line coupling through four Γ-shaped slots to generate four sequentially phased sources to excite the single layer patch antenna.The proposed antenna can provide an SWR bandwidth of over 16.5% (for SWR < 1.5) and an axial-ratio bandwidth of 13.3% (for AR < 3 dB).The performance of the antenna has been confirmed by both measurement and simulation.The antenna gain is enhanced and backlobe radiation is reduced by placing a reflector at an optimized location.