Design of Broadband and Optimum Gain Aperture Coupled Micro-Strip Antenna

Microstrip antennas have attained wide acceptance because of its size and conformability. But it has a limitation of less bandwidth. In order to overcome this various techniques have been proposed. Aperture coupling is one of them, it has a lot of design flexibility with various design parameters. In this paper an aperture coupled microstrip antenna is designed and simulated using CST Microwave studio. The designed antenna operates at X-band 9.79 to 11.79 GHz (VSWR <; 2) with 18.53% bandwidth, side lobe level (SLL) nearly -13 dB over bandwidth and the gain and directivity varies from 6.58 dB to 7.7 dB and 8.3 to 8.6 dBi, respectively.