Optimization of a Fabry-Perot cavity antenna

We propose a new method to increase both an antenna input reflection coefficient (S11) and overall efficiency of a Fabry-Perot cavity (FPC) antenna. In general, the FPC antenna consists of a partially reflective superstrate and a metal ground plane. By finding optimum arrangement of unit cells in the superstrate, we prove that we can largely widen an impedance matching bandwidth and raise overall efficiency at the same time. In addition, we also show that our method minimizes the reduction of antenna gain, which is difficult to avoid by expanding of the impedance bandwidth. All experimental results show good agreement with the prediction, which verifies the validity of our approach.