Performance Analysis of Frequency Tuned Micro strip Patch Antenna with DGS

Abstract

A simple technique to achieve frequency reconfiguration, dual frequency of operation, wideband operation and compactness in a conventional Microstrip patch antenna has been proposed in this communication. One of the conventional technique to achieve the above said enhanced characteristics is to etch some slots in the ground plane and the ground with slots is called as Defected Ground Structure.  A simple rectangular Microstrip patch antenna has been designed which work for the X-band frequency of 10 GHz and various DGS structures are introduced in the antenna ground plane. The basic antenna parameters are been analyzed in terms of frequency of operation, VSWR, gain and Radiation pattern. With the introduction of different types DGS structures we can observe that the operating frequency has shifted to the lower frequencies which lead to compactness. Achieved a compactness of 25% with the introduction of the DGS. Along with compactness Dual frequency of operation and Wideband width of operation   can also be observed for different DGS configuration. To validate the proposed technique the same DGS structures has been introduced in another circular patch antenna and observed that the change in antenna performance is same for both the antennas.