关键词: 矩量法, 物理光学, 积分方程-傅里叶变换, 自适应频率采样, 宽带分析

Abstract:

A highly efficient computational electromagnetic technique based upon the well known PO formulation combined with the modified IE-FFT and adaptive Stoer-Bulirsch frequency-sampling method is applied to wide-band analysis of antennas radiating in the presence of electrically large conducting platforms. By interpolating Green's function and introducing the concept of empty groups, the modified single-level FFT algorithm which is based on the subdomain FFT acceleration is employed to reduce matrix storage and to accelerate all the matrix-vector multiplications in both the linear system for moments and the iterative solver. Otherwise, the correction of the near-interaction is avoided. For the frequency response of electric currents, the SB algorithm using the rational approximation solution and the recursive rules is utilized to achieve fast frequency sweeping. Due to the above modifications, the PO hybrid method utilizes fewer unknowns and requires less solution time. Numerical examples are given to verify its validity.

Key words: method of moments, physical optics, integral equation fast Fourier transform(IE-FFT), adaptive frequency-sampling, wide-band analysis