High Gain waveguide slot Antenna using Array of Circular Parasitic Patches as superstrate

This letter proposes a low cost, simple, high gain Fabry-Perot Cavity antenna (FPC) using a array of circular parasitic patches as superstrate. The structure can be considered as a cavity resonator with FSS or partially reflecting surface. The proposed antenna is composed of a conventional waveguide slot antenna, with an extended broad wall and a array of parasitic patchs are placed over slot at a distance of about free space half-wavelength. The antenna with 3x3 PPs is considered on finite ground dimensions of 67.5 x 107 mm. The slot, parasitic patch dimensions, inter-element spacing, and FPC height are the influential factor in improving gain and bandwidth of antenna. Circular parasitic patches radius is 8 mm. The proposed antenna compared with conventional one. It has been shown that the proposed structure enhances antenna peak gain from 8 dB to 15.9 dB and antenna bandwidth from 11.4 %( 8.2-9.2GHz) to 18.6% (8 -9.65GHz)

کلیدواژه ها:

Waveguide slot antenna ، Fabry-perot ، parasitic patch ، resonant cavity antenna