Analysis Shaped Dielectric Lens Antennas using Hybrid method

Abstract

In this paper hybrid method of analysis of shaped dielectric lens with microstrip patch array is presented. Hybrid method combines the advantage of spherical modal expansion (SME) and geometrical optics (GO). First, SME is used to find the near fields using known far field expressions for the primary source. After obtaining spherical complex modal coefficients (SMCC), each mode is treated as a plane wave radiating through a shaped dielectric lens and analysed using GO. The far field at any point on a spherical surface surrounding the lens is the sum of individual modal contributions, which are then easily transformed to far field using a SME. This hybrid method is independent of lens geometry and computationally faster compared to any electromagnetic simulation software. As expected the prediction accuracy is between that of an exact SME technique and an EM flow solver. Results have been presented for an array with spherical lens.