Abstract
AbstractIn the design of quasi‐optical systems, the cross‐polarization introduced by off‐axis mirrors is a major concern to us. By Gaussian beam mode analysis (GBMA), the electric field could be predicted precisely with this factor. In this study, we present some significant expressions and a method based on the energy of modes to analyze the influence of design parameters such as the distance between two objects and the incident angles of beams on the cross‐polarization level of a two‐dimensional (2D) multi‐reflector system with a feed containing cross‐polarization. Finally, combining these discussions, an innovative 2D quasi‐optical system design algorithm with low cross‐polarization based on the particle swarm optimization (PSO) algorithm is proposed considering various system variables. In order to verify the validity and accuracy of our method, we compare the results of our approach and physical optics (PO) in the commercial software package GRASP10 with the example of a double ellipsoidal mirror system.
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