Bandwidth Enhancement in Multipatch Microstrip Antenna Array

In this paper a microstrip patch antenna has been used for microwave frequency. The patch antenna is printed on RT/DUROID 5880. In addition a rectangular conducting plate of comparable dimensions was placed above the patch in order to enhance the bandwidth. The package was used to analyze the effect of the top patch, in particular the variation of VSWR with two parameters, namely the distance between the two patches and the size of the upper patch. Simulation and experiment result of a constructed array of two multipatch microstrip antenna with resonance frequency at 5.2 GHz shows the return loss S11 of about -29 dB, gain level of about 10.683 dB with 23.07% bandwidth improvement and after that we have designed an array of three multipatch microstrip antenna and achieved a bandwidth about 29.61% with directivity about 11.47 dB and return loss 29 dB at the frequency 5.74GHz.