Compact Microstrip Patch Antenna with Switchable L-Shaped Slots for Wireless Applicationsf

摘要

In this paper, analysis and design of compact Microstrip patch antenna incorporated by two orthogonal L-shaped switchable slots is proposed to achieve circular polarization. Two pin diodes are inserted in to these L-shaped slots and by making these two pin diodes ON and OFF the antenna can be radiate with either right handed circular polarization or left handed circular polarization with wide bandwidth. Radiation patterns, return loss and axial ratios are presented. The antenna has an overall dimension of only 18 x 18 mm2 when printed on a substrate of dielectric constant 2.22. A rigorous experimental study has been conducted to confirm the characteristics of the antenna. The experimental results show that the designed antenna can provide excellent performance for Unlicensed & licensed WiMax (IEEE802.16a), future planetary missions and satellite link. Details of the antenna design; experimental and simulated results are presented and discussed.