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This paper presents a novel hybrid method to simulate complex antenna system, which comprises a planar bow-tie antenna and an extended hemispherical lens. It utilizes Ansoft High-Frequency Structure Simulator (HFSS) to simulate the planar antenna, which is preferred for complicated structure. Ray-tracing is used to illuminate the lens surface with the radiation from the planar antenna (computed via HFSS), and Fresnel transmission coefficients is employed to compute the fields across the boundary between lens and the air. The rebuilt far-field pattern after lens is calculated by integrating the current distribution on lens surface. The comparison between this hybrid method and commercial software, such as HFSS and CST, are made at 100GHz. For higher frequency, which is difficult to simulate using HFSS or CST, the hybrid method shows a potential to predict the far-field pattern by comparing with test results.

A Hybrid Method to Calculate Far-field Pattern of Bow-Tie Antenna on Extended Hemispherical Dielectric Lens