A Wideband Log Periodic Antenna with Fractal Koch Geometry and Rectangular Stub

Abstract

This paper deals with the development of wideband log periodic antenna by applying series iteration fractal Koch geometry and distributed inductive load. Rectangular stub is inserted at each end of fractal Koch structure for size reduction purposes. The dimension of conventional series iteration log periodic fractal Koch antenna (LPFKA) can be reduced by 18.24% with the addition of rectangular stub. The proposed antenna has a dimension of 285 mm x 245 mm deployed on FR-4 Epoxy dielectric substrate with relative permittivity of 4.7 and thickness of 1.6 mm. This antenna was designed to operate from 0.47 GHz to 0.79 GHz which focuses on Ultra High Frequency (UHF) Television White Space (TVWS) band applications. According to the simulation result, the proposed antenna achieves stable radiation patterns throughout the operating frequency band with the gains varies from 5.64 dBi to 6.7 dBi. The proposed antenna is a possible candidate for UHF TVWS applications.