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首页> 外文期刊>IEEE Transactions on Antennas and Propagation >Coherent Fourier Optics Model for the Synthesis of Large Format Lens-Based Focal Plane Arrays
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Coherent Fourier Optics Model for the Synthesis of Large Format Lens-Based Focal Plane Arrays

机译：基于大型镜头的焦平面阵列合成的相干傅立叶光学模型

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摘要

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 degrees (+/- 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.
机译：未来的亚毫米成像仪正在使用镜片的大型焦平面阵列（FPAS）开发，以增加视野（FOV）和成像速度。这种阵列的全波电磁分析是数值繁琐且耗时的。本文介绍了一种基于傅立叶光学器件的谱技术，与几何光学结合在一起，用于分析基于接收，基于镜头的FPA，具有宽FOV。该技术提供了一种数值有效的方法来导出辅助准光学组件的平面波谱（PWS）。该PWS用于计算放置在透镜的焦区区域的天线或吸收器接收的功率。应用该方法以最大化具有单片集成透镜馈送的成像器的扫描性能，而不采用优化算法。派生的PW可以直接用于定义镜头和馈送属性。合成的FPA实现了远低于由基于角FPA的标准公式预测的扫描损失。特别地，扫描高达+/- 17.5度（+/- 44波束宽）的扫描损耗的FPA呈现出52 dBi的指向性，符合未来子毫米成像仪的需求。该技术通过具有优秀协议的物理光学码进行验证。

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