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The focus of this work is to obtain a miniaturized microstrip patch antenna using defected ground structure (DGS) for S band and below for various low band applications. The antenna is also made to resonate in multiband frequencies. Initially the patch antenna is designed at 5 GHz which falls in C band design resonates at 4.48 GHz. The proposed DGS is integrated in the ground plane of the patch antenna for size reduction. However, process of size reduction is obtained by removing the ground plane of designed antenna and not changing the physical dimension of design. In order to improve the gain of this patch radiator, the DGS is further modified to retain its radiation properties. Finally, the resonance frequency of an initial microstrip antenna shifts from 4.48 GHz to various low band frequencies, with better performance miniaturization up to 86% with respect to conventional microstrip antenna is successfully obtained. A prototype of the antenna was fabricated with the Modified epoxy substrate. This technique is validated experimentally and measured results were in good agreement with simulated results, these antennas find their application in various ISM applications.

Size Reduction with Multiband Operating Square Microstrip Patch Antenna Embedded with Defected Ground Structure