Summary
International Symposium on Antennas and Propagation
2008
Session Number:2B03
Session:
Number:2B03-5
Time Domain Analysis of Characteristics of a Microstrip Patch Antenna with Metamaterial Substrate
Atsushi Kusunoki,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
From the end of the last century, there has been a growing interest in the investigation of artificial materials, which are called as metamaterials [1]- [3]. The material, also named as the left-handed material, is theoretically investigated by Veselago [4]. The metamaterial has a negative refractive index, and a negative refraction is then occurred at the interface between an ordinary dielectric material and the metamaterial. Furthermore, the direction of an energy flow is opposite to the wave vector of a plane electromagnetic wave in the metamaterial. While the material does not exist in nature, the metamaterial may be fabricated by periodic arrays of thin wires and split ring resonators [5]. This paper presents radiation characteristics of a microstrip patch antenna using a metamaterial substrate. A metal patch is located on the metamaterial substrate, and the microstrip line is connected to the patch to feed the antenna. Since the permittivity and the permeability of the metamaterial are dispersive, we express those parameters of the material as the Lorentz model [6]. Using the dispersion model and the constitutive relations of the metamaterial, we can derive partial differential equations for the electric and the magnetic field vectors of the metamaterial. The electromagnetic radiation field from the microstrip patch antenna may be obtained based on the ordinary FDTD method [7] and the ADEFDTD method [6]. Numerical results are shown that the effectiveness of the microstrip patch antenna with metamaterial substrate.