Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TA4
Session:
Number:3TA4-6
A Hybrid Method of PEC-TDS and CBF for Electromagnetic Radiation From array
Jie Yang, Feng Yang, Jun Ouyang, Biao Li, Xianfa Tang,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
The MOM-based integral equation method, because of its universal algorithm with fewer restrictions on the geometric structure and easy to simulate the material features, is widely used in the scattering and radiation problems. In recent years, integral equation methods to handle objects consisting of both dielectric and conducting material are: volume- surface integral equation (VSIE) [1], surface integral equation (SIE) [2], electric- magnetic current combined field integral equation (JMCFIE) [3], and other hybrid methods. However, the above methods using the subsectional basis functions would not be efficient for the analysis of arrays. This is because the dimension of the matrix to solve is too large，and the dimension increases very rapidly with the raise in the number of array elements. Especially for elements including dielectric materials, the matrix dimension will be more, and more memory and computing time will be consumed. In order to reduce the number of unknowns in dielectric, thin dielectric sheet (TDS) formulation is modified [4], and impedance boundary condition (IBC) [5] is used to account for the dielectric’s effect for dielectric-coated PEC surfaces. For large planar arrays, several approaches based on block concept have been studied extensively, including characteristic basis function (CBF) approach [6], macro basis function (MBF) approach [7]. In this paper, a hybrid method of Characteristics Basis Function (CBF) and coupled PEC-TDS surface integral equation is used to solve the radiation from the curved array on the thin dielectric substrate. The coupling between metal element and dielectric substrate is solved by using the PEC-TDS surface integral equation, and three kinds of basis functions are used to represent the currents on the conducting surface, the tangential currents and the normal currents in the substrate in method of moments (MoM). CBF method is used to solve the coupling between mutual elements. The following numerical examples will show the validity of this method.