Design of dual band patch antenna with bandwidth enhancement using complementary defected ground structure

A new and very simple way of implementing defected ground structure (DGS) in a microstrip patch antenna is presented. The dimension of DGS is exactly same as the dimension of radiating element. There are two different DGSs implemented in this paper. The DGSs are complement of each other with respect to their structures. The antennas with these complementary DGSs show four different frequencies of operation (10 GHz, 12 GHz, 16 GHz and 16.6 GHz) with enhanced bandwidth maximum of 22% with respect to the antenna without DGS. The proposed antenna can be implemented for X-band and Ku-band application.