Wideband analysis of planar scalable conducting bodies using characteristic basis function method

In this thesis, a method is developed which reduces the solution time of the problem of scattering and radiation from planar conducting bodies in a wide frequency band. The method utilizes the characteristic basis functions (CBFs) in a different way. The CBFs for the body are calculated at the highest frequency of interest and reused at other frequencies. The reduced impedance matrices generated earlier at lower frequencies are also used for the calculation of the ones at higher frequencies. The proposed method is applied to the problems of scattering from a square plate, radiation from a bowtie antenna, and a linearly tapered slot antenna. Bistatic radar cross sections (RCS) for the square plate and the radiation patterns for the bowtie and tapered slot antennas are calculated at the specified frequency band. In the first step, electric field integral equation at the highest frequency of interest is developed for the structure, and then impedance matrix is calculated by applying method of moments (MoM) to the equation. Then, characteristic basis functions are calculated using the MoM impedance matrix. Finally the solution of the problem in the frequency band of interest is obtained using these CBFs. The method proposed in this thesis results in a significant reduction in the CPU time compared to the traditional Method of Moments. Numerical results demonstrate that the method can be applied to the scattering and radiation problems with high accuracy.