Summary
International Symposium on Antennas and Propagation
2008
Session Number:3B07
Session:
Number:3B07-3
An Improved Hexagon Electromagnetic Band-Gap Structure with Filter Size Reduction Applications
Pao-Chun Lin, Chien-Chang Huang,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
The electromagnetic band-gap (EBG) structures, initiated by the photonic band-gap (PBG) ideals [1], have been drawn much attentions due to the wave forbidden features for stop bands and the slow wave characteristics for passbands. Applications for antenna/array performance enhancements [2-3], filters designs [4], and electromagnetic interference reductions [5] are reported in literatures. Moreover, the uniplanar square-shape EBG is proposed for easier fabrications with good insertion loss performance, increasing the versatility of the EBG applications [6]. Recently a uniplanar hexagon EBG has been proposed with better slow wave factor performances, suited for the circuit size reduction applications [7]. The insertion loss, however, is a little higher than the conventional square shape EBG structure [8]. This paper presents an improved hexagon EBG by combining the advantages of the square and the hexagon EBGs, for the similar applications of circuit size reductions. The designed EBG is placed at the ground plane of the microstrip line to increase the distributed capacitances and inductances for slowing the wave propagation. The simulations are performed by the commercial software using finite-element-method (FEM) to check the insertion loss and the slow wave behavior for passband, and the rejection for the stop band. These simulation results are confirmed by the measured data. A typical band-pass filter in printed-circuit-board (PCB) is analyzed and designed at 3.45 GHz to show the availability of the proposed EBG structure, with verifications of experiments.