New Fractal Geometry for Dual Band and Small Size Microstrip Patch Antenna

Abstract

A new technique to reduce the size of microstrip patch antennas is proposed for dual band operation, by replacing each side of conventional square patch and drilling in center. It is found that, the resonant frequency of the antenna can be greatly lowered (from 1.44 GHz to 0.925 GHz), for the higher iteration order. And this property can be utilized to reduce the size of the microstrip antennas (5.5 times of patch size reduction is achieved). It is also found the variation in gain between the two resonances (ƒ0 =0.925 GHz and ƒ1=1.8 GHz) does not exceed 1 dB , which represents good variation for most applications. The patches derived from this technique can find applications in integrated low-profile wireless communication systems. Antenna performance has been evaluated using HFSSv11software package.