DESIGN AND SIMULATION OF A MODIFIED CIRCULAR MICROSTRIP PATCH ANTENNA WITH ENHANCED BANDWIDTH

Abstract

In this paper, a modified circular microstrip patch antenna fed by a microstrip line feed is presented. The main aimwas to improve the narrow bandwidth of microstrip patch antennas while at the same time ensuring that otherimportant parameters of the antenna such as gain, efficiency, and impedance matching are not affected. The shapeof the patch was modified by adding some parts to it and removing some parts from it with the aim of achieving awider bandwidth. High frequency structural simulator (HFSS) was used to simulate and analyze the designed patch.Simulated results of return loss, VSWR, and Z parameters were then presented. Based on simulated results, theshape presented showed satisfactory operation in the frequency range 1647-1968 MHz which is within the L-band.The modified circular microstrip patch antenna showed remarkable improvement in bandwidth as compared toconventional microstrip patch antenna for return loss of less than -10 dB. The antenna also showed good impedancematching with the 50 Ω line that was used for simulation. The antenna is suitable for GSM 1800-1900 MHz systems.