Design of square patch antenna with a notch on FR4 substrate

Simulation and measured results of a square patch antenna with a notch to search their possible application on modern communication systems including WiMax systems are presented. The antennas are designed on an FR4 substrate and the notch angle is varied under different conditions. It is found that on varying the notch angle from 180° to 164°, antennas resonate at a single frequency but on reducing the notch angle further, antennas start resonating at two frequencies with improved bandwidth. The optimum performance of an antenna is obtained when the notch angle is set to 151°. Different radiation parameters of the antennas under varying conditions are analysed and their possible applications in modern communication systems are investigated.