A Fourier Optics Tool to Derive the Plane Wave Spectrum of Quasi-Optical Systems

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Abstract

We present a freely accessible graphical user interface for analysing antenna-fed Quasi-Optical systems in reception. This analysis is presented here for four widely used canonical Quasi-Optical components: parabolic reflectors, elliptical, extended hemispherical, and hyperbolic lenses. The employed methods are Geometrical Optics and Fourier Optics. Specifically, Quasi-Optical components are illuminated by incident plane waves. By using a Geometrical Optics based propagation code, the scattered fields are evaluated at an equivalent sphere centred on the primary focus of the component. The Fourier Optics methodology is then used to represent the scattered fields over the focal plane as Plane Wave Spectrum. A field correlation between this spectrum and the antenna feed radiating without the Quasi-Optical component is implemented to evaluate the induced open-circuit voltage on the feed in reception. By performing a field matching between these two spectral fields, feed designers can optimize the broadside and/or steering aperture efficiencies of Quasi-Optical systems in a fast manner. The tool is packaged into a MATLAB graphical user interface, which reports the efficiency terms, directivity and gain patterns of antenna-coupled Quasi-Optical systems. The described tool is validated via full-wave simulations with excellent agreement.
Original languageEnglish
JournalIEEE Antennas and Propagation Magazine
Publication statusAccepted/In press - 2021

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