Serration effect on gain for microstrip E-Shape patch antenna

In this work we focus on the effect of serration on E-Shape patch antennas. We simulated 2 different E-shape antennas with the same length. The first one has serrated edge and the second one doesn't have. Then we compared the results. Sonnet Suites is used as a simulation program. At 4.22 GHz -15.2 dB return loss and 6.237 dB gain were observed.