Electromagnetic band gaps from H-shaped fractals

Department of Physics Science and Technology, Wuhan University, 430072 Wuhan, P.R. China

Corresponding author: xzzhao@whu.edu.cn

Received: 31 October 2005
Revised: 17 June 2006
Accepted: 21 July 2006
Published online: 11 October 2006

Abstract

This paper presents a new method to simulate the properties of Frequency Selective Surface (FSS) composed of planar H-shaped fractals structure exhibiting multiple band gaps of electromagnetic waves. The FSS sample can be easily fabricated as that of the Printed Circuit Board (PCB). The electromagnetic characteristics of this H-shaped fractal structure were studied mainly by numerical simulation based on Finite Integration Technique (FIT). The simulation results present a direct image of surface currents when certain frequency electromagnetic waves incident on the surface of the sample, which is in a considerably good agreement with the experimental results. Based on the comparison of simulated and experimental result it is suggested that the planar H-shaped fractals structure has quasi-periodic multiple band gaps and the size can be significantly smaller than the relevant electromagnetic band gap wavelength.