Computer-aided bifocal dielectric lens antenna design for MH wave application

A Bifocal Dielectric Lens Computer Model was developed for the aid in the design analysis and performance evaluation for multiplebeam application. The model calculates and plots lens contour, the aperture distributions, and the corresponding radiation patterns and gain, with the feed located at any point on the focal arc. The ray lattice numerical method proposed by Holt and Mayer is very simple. The two surfaces of lens contour are determined through the ray path length constraints and Snell's refraction law. Design equation and equations for computing the aperture phase distribution at each interbeam location are derived. Sample calculations for lens contour design, aperture phase distributions, and radiation patterns of 8-multiplebeams at 94 GHz are included.