Triple-band H-slot microstrip patch antenna for WiMAX application

Microstrip patch antennas are strong candidates for use in many wireless communications applications. In this paper, a triple-band H-slot microstrip patch antenna for Worldwide interoperability for microwave access(WiMAX) is presented. The radiation performance such as VSWR, return loss, radiation pattern and gain of the antenna are simulated using Ansoft HFSS and presented. This antenna has a simpler structure than other antennas designed for realizing triple-band characteristics which is just composed of a coaxial feed line, a substrate, and a ground plane. The operating frequencies of the proposed design fall in IEEE802.11a (5.20 GHz and 5.775 GHz), IEEE802.11b (2.45 GHz) and IEEE802.11y (3.65 GHz). It operates on 2.42-2.46 GHz, 3.71-3.78 GHz and 5.3-5.53 GHz bands. Radiating patch lies on the Quartz glass substrate which is having dielectric constant 3.74. Coaxial feeding technique is used to feed the antenna with 50 ohm impedance. This proposed antenna enhances the return loss of -13.50 dB at 2.45 GHz, -11.52 dB at the 3.75 GHz and -12.8 dB at 5.4 GHz frequencies. Computer simulated results showing the VSWR value lesser than two at the 2.42-2.6 GHz, 3.71-3.78 GHz and 5.3-5.53 GHz frequency range of WiMAX standards.