A Wideband Circularly Polarised High‐Gain Antenna Using Array Technology and Truncated Dielectric Plates

A gain enhancement method is presented for a circularly polarised (CP) wideband Fabry–Perot resonator antenna (FPRA). The proposed antenna structure consists of a multilayer configuration of closely spaced truncated dielectric plates (TDPs) and a broadband CP patch array. By appropriately designing the patch array, the 3‐dB axial ratio (AR) bandwidth is effectively broadened, and the overall gain performance of the antenna is improved. The TDPs act as partially reflective surfaces (PRS), exciting the Fabry–Pérot (FP) resonance effect to further enhance the radiation efficiency and gain. Moreover, the multilayer TDPs are utilised to optimise the phase distribution of the antenna aperture field, significantly reducing its non‐uniformity and achieving a more uniform phase profile. This leads to an extended 3‐dB gain bandwidth and enhanced peak gain. Measurement results demonstrate that the proposed antenna achieves a −10 dB impedance bandwidth of 55.6% (8.73–15.45 GHz), an AR bandwidth of 42.7% (9.50–14.65 GHz) and a 3‐dB gain bandwidth of 50.8% (9.52–16 GHz), with a peak gain of 15.19 dBic. An aperture efficiency of 46.3% is achieved at 10.2 GHz.