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Comprehensive simulation platform for a metamaterial imaging system

机译：用于超材料成像系统的综合仿真平台

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Recently, a frequency-diverse, metamaterial-based aperture has been introduced in the context of microwave and millimeter wave imaging. The generic form of the aperture is that of a parallel plate waveguide, in which complementary metamaterial elements patterned into the upper plate couple energy from the waveguide mode to the scene. To reliably predict the imaging performance of such an aperture prior to fabrication and experiments, it is necessary to have an accurate forward model that predicts radiation from the aperture, a model for scattering from an arbitrary target in the scene, and a set of image reconstruction approaches that allow scene estimation from an arbitrary set of measurements. Here, we introduce a forward model in which the metamaterial elements are approximated as polarizable magnetic dipoles, excited by the fields propagating within the waveguide. The dipoles used in the model can have arbitrarily assigned polarizability characteristics. Alternatively, fields measured from actual metamaterial samples can be decomposed into a set of effective dipole radiators, allowing the performance of actual samples to be quantitatively modeled and compared with simulated apertures. To confirm the validity of our model, we simulate measurements and scene reconstructions with a virtual multiaperture imaging system operating in the K-band spectrum (18-26.5 GHz) and compare its performance with an experimental system. (C) 2015 Optical Society of America
机译：近来，在微波和毫米波成像的背景下，引入了基于分形，基于超材料的孔径。孔的一般形式是平行板波导的形式，其中图案化到上板中的互补超材料元素将能量从波导模式耦合到场景。为了在制造和实验之前可靠地预测这种光圈的成像性能，必须有一个准确的前向模型（可预测来自光圈的辐射），用于从场景中任意目标散射的模型以及一组图像重建允许从任意一组测量进行场景估计的方法。在这里，我们介绍了一个正向模型，其中超材料元素近似为可极化的磁偶极子，被波导中传播的场激发。模型中使用的偶极子可以具有任意分配的极化率特性。或者，可以将从实际的超材料样品中测得的场分解为一组有效的偶极辐射器，从而可以对实际样品的性能进行定量建模，并与模拟孔径进行比较。为了确认我们模型的有效性，我们使用在K波段频谱（18-26.5 GHz）中运行的虚拟多孔径成像系统模拟测量和场景重建，并将其性能与实验系统进行比较。 （C）2015年美国眼镜学会

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