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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 891620, 6 pages
http://dx.doi.org/10.1155/2014/891620
Research Article

Highly Directional Small-Size Antenna Designed with Homogeneous Transformation Optics

1The Electromagnetics Academy at Zhejiang University, Zhejiang University, Hangzhou 310027, China
2Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
3School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China

Received 7 March 2014; Revised 23 April 2014; Accepted 27 April 2014; Published 21 May 2014

Academic Editor: Wenxing Li

Copyright © 2014 Zuojia Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Achieving high directivity antenna usually requires a large size antenna aperture in traditional antenna design. Previous work shows that, with the help of metamaterials and transformation optics, a small size antenna can perform as high directivity as a large size antenna, but the material parameters are inhomogeneous and difficult to realize. In this paper, we propose a linear homogeneous coordinate transformation to design the small size antenna. Distinguishing from inhomogeneous transformation, we construct a regular polygon in virtual space and then divide it into several triangle segments. By applying linear homogeneous coordinate transformation, the antenna devices can be greatly compressed without disturbing the radiation patterns by using homogeneous metamaterial substrates. The material parameters of the antenna designed from this method are homogeneous and easy to fabricate. Square and hexagonal antenna structures are numerically demonstrated to illustrate the validity of our methodology.