Abstract: Compact microstrip patch antenna with circular slot is proposed for dual band application. The proposed design offers wide bandwidth and dual band operation useful for WLAN and X band application. This antenna is designed by adopting a rectangular patch on FR-4 epoxy substrate with dielectric constant (e_r) is 4.4. Antenna is simulated using electromagnetic solver HFSS. The antenna has small size of 21.1 32 1.6 mm3. The proposed antenna have return loss bandwidth of around 1.5 GHz (4.28 GHz 5.84 GHz) i.e. 31% at lower band and 6 GHz (7.15 GHz 13.21 GHz) i.e. 60% at higher band. The gain of antenna is 4.27 dB at resonant frequency. Various antenna characteristics like VSWR, Directivity, Impedance, Radiation pattern is also given in the paper.

Keywords: Fire Redundant-4 (FR-4), Wireless Local Area Network (WLAN), HFSS.