A Novel High Gain Cavity Backed Micro Strip-Fed Circular Triangular Corner Fractal Antenna for UWB Applications

Abstract

In the current article, a novel micro strip-fed circular triangular corner fractal unidirectional antenna with high gain is proposed for ultra wideband (UWB) applications. This antenna consists of circular patch with triangular slot with three iterations. A prototype of antenna has been designed on FR4 substrate having dielectric constant 4.4 and thickness 1.6 mm. This reference antenna is then placed in a cavity made up of FR4 having thickness same as that of substrate of antenna. The gain of proposed antenna without cavity is on an average 4.146 dB and when placed in a cavity is 6 dB. There is maximum gain increase by 2.8 dB at 11 GHz using this technique. This proposed circular triangular corner fractal antenna with high gain cavity can be used for UWB system, microwave imaging, precision position system and radar tracking system since it covers a band of frequencies from 3.0481–16.388 GHz.