Design of a 2?2 water dielectric patch antenna array for Wi-Fi application

A kind of 2×2 water dielectric patch antenna array for Wi-Fi communication application is presented. The special feature of the antenna is using pure water to replace the top metallic patch of the traditional microstrip antenna. The water antenna is aperture coupled fed so that it is easy to integrate a feed network for the antenna array. Simulation is conducted with a commercial solver and a prototype is fabricated to verify the correctness as well. A measured impedance of 17.21% from 2.23 to 2.65 GHz for |S₁₁|<; -10dB, a gain up to 12.8 dBi and a good stable radiation pattern with low cross polarization and low backlobe are achieved. The result shows that the water antenna has similar performance as the usual metallic microstrip antenna at the lower microwave frequencies.