Broadband circularly polarised dielectric resonator antenna fed by wideband switched line coupler

A dual-feed rectangular dielectric resonator antenna with a wideband switched line coupler is proposed for generating broadband circular polarisation. The new wideband switched line coupler provides good impedance matching, equal power splitting and consistent 90° phase shifting over a wide bandwidth. The proposed antenna exhibits a 3 dB axial ratio bandwidth of 47.69% and an impedance matching bandwidth of 48.46% for a voltage standing wave ratio ≤2.