A 30X20X1.6mm3 Novel Rhombus Shaped ring type multiband Antenna was proposed in this paper. The Antenna has 25x15mm2 partial ground inserted below the FR4 Epoxy Substrate to improve performance of Antenna. In addition, we added two rectangle shaped patch structures of dimensions 14X5.5mm2 on both sides of Feed structure to improve S11.The proposed design operates at three bands covering C, X, and Ku band regions. Here we got better S11 at 12.1GHZ which is useful for Radar Applications.
