A compact multi-slots loaded gap coupled CP antenna with DGS for WLAN/WiMAX applications

摘要

In this article a novel compact circularly polarized slotted gap coupledsemi-circular patch antenna is presented for WLAN and WiMAX applications.The prototype of the designed antenna is fabricated with an area of42.5 × 42.5 mm~2. The circular polarization (CP) radiation is obtained by introducinga square ring slot defect in the ground plane whereas wide impedancebandwidth is achieved by gap coupled semi-circular patches with L-shapedslots. In order to improve the antenna bandwidth with better impedancematching an inclined slot is etched from the center of the patches. Further, tounderstand the effect of slots on antenna characteristics a parametric study isconducted. The measured impedance bandwidth (|S_(11)| ≤ −10 dB) and axialratio bandwidth for AR ≤ 3 dB of the proposed antenna are 83.08%(5.15-12.47 GHz) and 34.29% (4.30-6.08 GHz), respectively. The gain of theantenna is > 4 dBi within the CP band. The measured and simulated resultsare well accepted.