Gain and Bandwidth Enhancement of Waveguide Slot Antenna Using Two Layers FSS as Superstrate

This letter proposes a small size, compact, high gain Fabry-Perot Cavity antenna (FPC) usingtwo layers FSS as superstrate. The design strategy of high gain Fabry-Perot resonator antennas(FPRA), which have a superstrate with increasing phase in the operating band, has beenapplied to design the antenna. In the proposed design, two layers FSS superstrate consistingof 3 x 3 and 7 x 7 rectangular patch cells, printed on the bottom and top of the rectangulardielectric slab, respectively, is designed to be highly reflective to achieve gain and directivityenhancement. The slot, FSS dimensions, inter-element spacing, and FPC height are theinfluential factor in improving gain and bandwidth of antenna. A waveguide slot antenna isused as a primary feed for the configuration. The proposed antenna compared withconventional one. It has been shown that the proposed structure enhances antenna peak gainfrom 6.4 dB to 17.5 dB and antenna bandwidth from 12 %( 8.2-9.25GHz) to 14.2% (8.15 -9.4GHz).

کلیدواژه ها:

Waveguide slot antenna ، Frequency selective surface ، Fabry-perot ، resonant cavityantenna ، high gain