A Wideband Fabry-Pérot Antenna With Enhanced Gain in the High-Frequency Operating Band by Adopting a Truncated Field Correcting Structure

A novel method to enhance the high-frequency gain of a wideband Fabry–Pérot (FP) antenna by using a truncated field correcting structure (TFCS) is proposed. The TFCS is formed by laminated dual-layer dielectric substrates and acts as the high-frequency operating band phase and amplitude correcting structure of the FP antenna for the radiated field. This method not only has a small effect on the operating bandwidth of the antenna, but also has a positive effect on improving the gain over the low-frequency operating band. The simulation and experimental results verify that the TFCS can effectively enhance the gain within the high-frequency operating band, and expand the 3 dB gain bandwidth of the FP antenna. The measured results show that the proposed antenna has a 10 dB return loss bandwidth of 8.49–12.34 GHz (37.0%), a 3 dB gain bandwidth of 8.48–11.82 GHz (32.9%), and a maximum gain of 17.73 dBi. The 3 dB gain bandwidth of the FP antenna is extended from 28.8% to 32.9% after loading with the TFCS, and the maximum gain enhancement within the high-frequency operating band is increased by 3.48 dB at 11.58 GHz.