A novel design of Fabry-Perot antenna using metamaterial superstrate for gain and bandwidth enhancement

The procedure of gain enhancement for a microstrip patch antenna by employment of metamaterial superstrates and forming Fabry-Perot (FP) antennas is presented and discussed in this paper. In order to improve the gain characteristic of the microstrip patch antenna, a novel metamaterial superstrate with S-shaped elements is implemented. The main advantage of the presented S-shaped elements structure is that, it leads to achieve simultaneous enhancement on antenna gain and bandwidth. The microstrip patch antenna and its reflective surface are designed and modified for ISM-band, which operates at 5.725–5.875 GHz. A prototype of the designed antenna structure is manufactured and measured. The designed and fabricated antenna has a simple structure and does not include undesirable complexity of the recently reported FP antennas. The antenna has a good radiation behavior in the improved desired bandwidth of 5.65–5.935 GHz with more than 0.92% impedance bandwidth and 8 dBi gain improvement at maximum radiation direction.