A novel dual band microstrip patch antenna with DOS for X-band applications

A Microstrip Patch antenna with two operating frequencies for radar application is presented. The antenna is modeled to resonate at two frequencies in X-band. The X-band frequency range lies between 8 to 12 Gigahertz and are mostly used in radar applications. The design consists of Defected Ground Structure (DGS) provided to improve the antenna performance. The dielectric substrate used by the antenna is of low cost FR4 (Flame Retardant) Epoxy. The Ansoft High Frequency Structural Simulator (HFSS) Version 12 software is used to analyze the results. The parameters like gain, return loss, directivity and bandwidth are discussed in the paper. With 9.19 GHz and 10.82 GHz as the resonant frequencies, a return loss of -22.91 dB and -40.99 dB is obtained with 540 MHz and 1600 MHz as the bandwidth respectively.