Abstract: This paper presents design of E slot microstrip patch Antenna for WLAN Application. The design requirements for the antennas include a VSWR < 2:1 for 50 O reference impedance and return loss is less than to -10 dB. The simulation of the proposed antenna is carried out using Ansoft HFSS. The E-slot microstrip patch antenna was then fabricated using microstrip line feed arrangement and to be measured by vector network analyser (VNA) to carry out its S11 and VSWR result. The design targets the WLAN IEEE 802.11 n frequency band (5.47 GHz) .An antenna is designed on a GIL GML 1032 (tm) substrate with thickness of 0.762 mm, dielectric constant (er) 3.2 & loss tangent (tan d) is 0.003. Proposed antenna has a compact size 29 24 mm2 .Simulated design is working from 5.39 GHz to 5.49 GHz whereas fabricated antenna is working from 5.38 GHz to 5.5 GHz which covers the WLAN frequency band. The E-slot microstrip patch antenna has minimum simulated return loss is -23.574 dB at 5.44GHz whereas after fabrication minimum achieved return loss is -24.007 dB at 5.43 GHz. Achieved simulated Bandwidth is 100 MHz (1.83%) and after fabrication bandwidth increased and becomes 120 MHz (2.21%). Maximum simulated gain 6.49 dBi is achieved with the proposed geometry. The serious limitation of this microstrip antenna is narrow bandwidth which is few percent. The simulated 2-D and 3-D Radiation Pattern provides omnidirectional pattern. In this paper measured return loss, VSWR, bandwidth percentage is compared to simulated results for better understanding. The proposed E-slot microstrip patch antenna is very promising for various modern communication applications such as WLAN and in C- band applications.

Keywords: WLAN, E-Slot, HFSS, VSWR, Return Loss, Radiation Pattern, IEEE.