Design of a wideband Fabry-Perot resonator antenna with a double-layer partially reflective surface

A novel Fabry-Perot resonator antenna using a double-layer partially reflective surface (PRS) to enhance the operating bandwidth is proposed. Two layers of double-sided printed substrate are employed as the PRSs. A higher-permittivity dielectric substrate is inserted between the two PRSs to produce a positive reflection phase gradient, which is essential to expand the bandwidth. A wideband aperture-coupled microstrip antenna is utilized as the feed antenna to further improve the working bandwidth. A prototype of the proposed antenna is fabricated and tested to validate the simulated results. The experimental results show that the designed antenna has a wide impedance bandwidth (S11<-10dB$$ \left|{S}_{11}\right|) of 9.43-13.0 GHz (35.7%) with a 3-dB gain bandwidth ranging from 9.12 to 12.26 GHz (31.4%) and a peak gain of 15.4 dBi at 10 GHz.