BROADBAND CIRCULARLY POLARIZED GAP-COUPLED ARRANGEMENT OF RECTANGULAR PATCHES FOR MODERN COMMUNICATION SYSTEMS

摘要

The radiation performance of broadband circularly polarized gap-coupled arrangement of rectangular patches is reported in this article. This arrangement of patches is designed on glass epoxy FR-4 substrate. The considered structure consists of three rectangular patches having separation "d" between them. The central designed patch is excited through a single inset feed point while the other two patches are gap coupled to the central patch. After extensive optimizations, it is realized that the considered structure resonates at two closely spaced frequencies lying in the median band for the WiMax communication systems approved by IEEE 802.16 Working Group and presents nearly 12% impedance bandwidth. Additionally, the radiations are circularly polarized in nature, though the axial ratio bandwidth is narrow. The radiation patterns in the entire bandwidth are identical in nature.