Bistatic k-Space Imaging for Electromagnetic Prediction Codes for Scattering and Antennas

摘要

A bistatic k-space image concept for frequency domain electromagnetic computer codes is presented. The concept enables images to be computed without the frequency sweep required for experimental images and results in significant reduction in computation effort. This analytical image technique uses bistatic radiation computed from a generalized radiation integral. The technique can be applied to antenna or scattering problems. One-, two-, or three-dimensional images can be computed. The theory for the method and images in 1-D, 2-D, and 3-D for selected scattering and antenna examples are presented. Electromagnetic computer codes utilized for the examples include patch and body-of-revolution method-of-moment computer codes, a physical optics computer code, and a finite element frequency domain computer code. Also, a comparison of the computational method with the experimental swept-frequency-rotation-angle approach is included. Finally, flat plate target 1-D and 2-D images measured experimentally are compared with images computed by the bistatic k-space approach.