Accurate Modeling of Dichroic Mirrors in Beam-Waveguide Antennas
Accurate Modeling of Dichroic Mirrors in Beam-Waveguide Antennas
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DOI：
10.1109/tap.2012.2231928
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发表时间：
2013-04
影响因子：
5.7
通讯作者：
M. Pasian;M. Bozzi;L. Perregrini
中科院分区：
文献类型：
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作者：
M. Pasian;M. Bozzi;L. Perregrini
频率选择表面，也称为分色镜，通常是假设一个均匀的平面波激励进行分析。然而，当这些装置在反射器天线内用于以不同频率联合收割机/分离波束时，它们通常被波纹喇叭照射，这产生了不能用均匀平面波近似的辐射图案。因此，正确分析喇叭产生的电磁场与反射镜给出的透射（或反射）响应之间的相互作用非常重要。为了完成这一任务，本文提出了一种基于平面波展开的喇叭产生的场的方法。所提出的方法，这是能够提供的退化，由于分色镜的喇叭辐射模式的共极和交叉极性的组件，验证与测量的有效性。
Frequency selective surfaces, also called dichroic mirrors, are usually analyzed assuming a uniform plane-wave excitation. However, when these devices are used within reflector antennas to combine/separate beams at different frequencies, they are often illuminated by corrugated horns, which generate a radiation pattern that cannot be approximated by a uniform plane wave. For this reason, it is important to properly analyze the interaction between the electromagnetic field generated by the horn and the transmission (or reflection) response given by the mirror. To carry out this task, this paper presents an approach based on the plane wave expansion of the field generated by the horn. The effectiveness of the proposed method, which is able to provide the degradation due to the dichroic mirror to the horn radiation pattern for both the co-polar and the cross-polar component, is validated versus measurements.