Summary
International Symposium on Antennas and Propagation
2008
Session Number:2B03
Session:
Number:2B03-4
1-D flat cassegrain sub-reflector using EBG structure with graded reflection phases
Cheolhong Son, Kihun Chang, Jihwan Ahn, Young Joong Yoon,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
In recent years, electromagnetic band gap (EBG) structures have been investigated by focusing on the low profile, radiation pattern of the antenna since the mushroom-type EBG structure was introduced. EBG structures consist of periodic metal-dielectric composite textures on the ground plane. The phase range of the EBG structure is from 180? to -180? [1]. In addition, the phase of EBG structure can be realized at any range including 0? where is operated as artificial magnetic conductor. Using the phase properties of EBG structures, a reflector antenna can be improved from the viewpoint of profile reduction. Reflector antenna has high gain but it is not efficient to handle because the structure is too big and curve. The phase properties of EBG structure enable it to change from reflector antenna’s curve to flat type as remained reflector antenna’s characteristic. Using graded reflection phases obtained by tuning the textures’ sizes, the reflection phase characteristic of conventional cassegrain sub-reflector can be approximately as a physically flat type. Therefore, using EBG structure, a 1-D flat cassegrain sub-reflector with graded reflection phases at 12GHz is proposed.