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

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Abstract

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

Original languageEnglish
Article number9171563
Pages (from-to)734-746
Number of pages13
JournalIEEE Transactions on Antennas and Propagation
Volume69
Issue number2
DOIs
Publication statusPublished - 2020

Keywords

  • Focal plane arrays (FPAs)
  • Fourier optics (FO)
  • geometrical optics (GO)
  • lens antennas
  • reflector antennas
  • spectral techniques
  • submillimeter wavelengths

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