ABSTRACT
An entirely new technique has been designed to couple the advantages of both the microstrip patch antenna and rectangular waveguide. Patch antenna consists of two patches, one radiator patch which faces outside, and the other faces mouth of the rectangular waveguide. Antenna parameters like return loss, gain, bandwidth, polarization and radiation pattern were studied in detail by changing geometrical features of antenna like length of patch facing waveguide side, by varying the feed point distance that is the distance from the corner of rectangular patch to centre of the circular patch, by different orientation of circular patch from the corner of rectangular patch where it is connected to radiating side circular patch through PTH(plated through hole),by placing the patch on different points on the rectangular patches. The obtained results were discussed in detail and explained. In part 2 detail mathematical analyzing steps were discussed. In part 3 moment’s method along with its application to waveguide coupled microstrip patch antenna discussed In this paper a new mathematical tool is worked out which explains the observed the return loss graph effectively. This tool is called effective fringing area method. First we considered here waveguide coupled Microstrip patch antenna as the parallel load comprising of four elements .Along with this observed return loss graph and radiation pattern graph is provided.
