DefinePK

Abstract

Microstrip patch antennas have been widely used in a various useful applications, due to their low weight and low profile, compatibility, easy and cheap realization. A low profile patch antenna for WLAN application is proposed in this paper. A slot technique for microstrip antenna is proposed for better performance which is aperture slot on the design microstrip patch rectangular antenna. The study in this research is based on the performance of the aperture slot microstrip antenna, in terms of return loss, bandwidth and radiation pattern, by varying the aperture shapes. In this project, aperture shape is focused on L shape and is carried out from the design until simulation using Computer Simulation Tool (CST). The L slot aperture is designed in the middle of rectangular patch antenna. The feed line design in this project will be based on quarter wave impedance matching in order to match the 50 ? microstrip line with load impedance. For the slot design, the length and its width will be vary to get the best response. The slotted micro strip antenna in this comparison has almost the same design parameters as the one without the slot, with the obvious difference being that slotted antenna has an L shaped slot in the middle. This small difference, however, yields to a much higher return loss and increase in bandwidth. Moreover, even these results can be further enhanced by optimizing the size, shape and position of the slot. The rectangular patch antenna is design such that it works in the Wireless Local Area Network (WLAN) specification. The resonated return loss for simulated rectangular aperture slot is -29.49 dB while for the antenna without slot technique gives -17.63 dB. Radiation patterns of all antennas are simulated and the performance is acceptable. They produced E-plane Half Power Beam Width (HPBW) of 80º and H-plane HPBW of 110º.