Abstract
In the present paper, a wideband circularly polarized micro strip antenna is designed for application in wireless local area network (WLAN). The proposed antenna is L strip fed proximity coupled circular micro strip antenna where the radiating patch is loaded by parallel slots of unequal length. The structure is investigated using circuit theoretic approach and simulated using IE3D simulation software. The patch is designed on a thick substrate of thickness of 13 mm and provides wide band operation. The circular polarization is achieved by cutting two asymmetric parallel to linear axis of feed, slots on circular radiating patch to produce orthogonal modes. The simulation results for input impedance, VSWR, radiation pattern, directivity and gain are presented. Bandwidth is found to be dependent on length of horizontal part of L-strip as well as impedance matching at feed location. A bandwidth of up to 97.72% is enhanced (for VSWR≤2) for Li=0.102λo and h2=0.201λo. The right circularly polarisation was achieved for two bands with 6% and 7% axial ratio band width at resonance frequency. Index Terms: L-strip feed, proximity coupled, inset slot, circular polarisation, wideband,
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