Coherent Fourier Optics Model for the Synthesis of Large Format Lens-Based Focal Plane Arrays

Future sub millimeter imagers are being developed with large focal plane arrays (FPAs) of lenses to increase the field view (FoV) and imaging speed. A full-wave electromagnetic analysis such is numerically cumbersome time-consuming. This article presents a spectral technique based on Fourier optics combined geometrical for analyzing, in reception, lens-based FPAs wide FoVs. The provides efficient methodology derive wave spectrum (PWS) secondary quasi-optical component. PWS used calculate power received by an antenna or absorber placed at region lens. method applied maximize scanning performance monolithically integrated lens feeds without employing optimization algorithm. derived can be directly define feed properties. synthesized FPA achieved scan losses much lower than ones predicted standard formulas horn-based FPAs. In particular, loss below 1 dB while up ±17.5° (~±44 beam-widths) presented directivity 52 dBi complying needs future imagers. validated via physical code excellent agreement.