A Wideband Fabry-Perot Resonant Antenna with Sextuple-Layer Partially Reflective Surface

This manuscript presented a Fabry-Perot resonant antenna with sextuple-layer partially reflective surface working in both C-band and X-band. To enhance the performance of proposed resonant antenna, a modified U-slotted patch antenna is introduced as the feed. A wideband (5.0 GHz - 8.9 GHz) positive reflection phase gradient is introduced by the partially reflective surface element. The presented element consists of six metallic layers, formed by five square patches and a square-ring patch, and three stacked substrates separated by two air gaps. 5 × 5-sextuple-layer elements are arranged periodically to form a partially reflective surface which is placed ahead of the feed. Then, the Fabry-Perot resonant antenna is obtained. In simulation, the proposed antenna realizes a 108.7% bandwidth (3.8 GHz - 12.9 GHz) for 3-dB drop while the peak gain is 9.8 dBi. Meanwhile, its impedance bandwidth and overall size respectively are 100.0% (4.0 GHz - 12.0 GHz) and 0.80λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> × 0.80λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> × 0.47λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> (this value corresponds to the length, width and height of the presented antenna, and λ0 is the wavelength at 8.0 GHz).