Dual-Band Design of Microstrip Patch Antenna with Copper Ring Superstrate for X-Band Applications

A dual-band design of microstrip patch antenna has been presented for X-band applications. A copper ring superstrate supported by two dielectric posts is placed above the rectangular patch. The lower and higher resonant bands have been achieved strategically using the resonance behavior of the rectangular patch and the copper-ring superstrate respectively. The proposed antenna resonates near 9 GHz and 11.35 GHz with an impedance bandwidth of 6.8% and 3.1% respectively. About 8.2 dBi and 10.1 dBi peak-gain values have been obtained in these two frequency bands respectively. The antenna prototypes have been fabricated using low loss substrate and validated experimentally. The measured data closely agree with the simulated result.