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.