Design and Simulation of a Circular Patch Microstrip Antenna for Wimax 3.5 GHZ Applications

A circular patch microstrip antenna for WiMAX applications has been successfully designed and simulated using CST Studio Suite software. The antenna is designed on a lossy FR-4 substrate with a dielectric constant of 4.4 and a thickness of 1.6 mm. The substrate dimensions are 41 mm × 35 mm × 1.6 mm. The circular-shaped patch is modified with double-slot features on the feedline to enhance impedance matching performance. Simulation results indicate that the antenna resonates at 3.5 GHz, achieving a return loss of –19 dB, meeting the minimum standard for wireless communication applications. The VSWR at the resonant frequency is 1.24, and the antenna bandwidth (at –10 dB return loss) reaches 300 MHz, covering the 3.35–3.65 GHz frequency range. The realized gain is 2.33 dBi with a total efficiency of 42.3%. The antenna exhibits a directional radiation pattern with omnidirectional characteristics. These results indicate that the proposed circular patch microstrip antenna is suitable for WiMAX applications, fulfilling essential performance metrics including return loss, bandwidth, and gain, making it suitable for WiMAX-based wireless applications.