Investigation of Multi Band Microstrip Line Fed Antenna using DGS Technique for WLAN/WiMAX Applications

Abstract

A multiband planar monopole antenna fed by microstrip line feed with Defected Ground Structure (DGS) is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The proposed antenna consists of a rectangular microstrip patch with rectangular slit, including the circular defect etched on the ground plane forming DGS structure. The soft nature of the DGS facilitates improvement in the performance of microstrip antennas. The simulated -10 dB bandwidth for return loss is from 2.9-3.77 GHz, 3.91-6.36, covering the WLAN: 5.15-5. GHz bands. The design and optimization of DGS structures along with the parametric study were carried out using IE3D ZELAND which is based on method of moment.