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Demonstration of wideband metal mesh filters for submillimeter astrophysics using flexible printed circuits

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Abstract

We developed a wideband quasi-optical band-pass filter covering 170–520 GHz by exploiting the recent advancements in commercially available flexible printed circuit (FPC) fabrication technologies. We designed and fabricated a three-layered stack of loaded hexagonal grid metal meshes using a copper pattern with a narrowest linewidth of $ 50\;\unicode{x00B5}{\rm m} $ on a polyimide substrate. The measured frequency passband shape was successfully reproduced through a numerical simulation using a set of parameters consistent with the dimensions of the fabricated metal meshes. FPC-based metal mesh filters will provide a new pathway toward the on-demand development of millimeter/submillimeter-wave quasi-optical filters at low cost and with a short turnaround time.

© 2020 Optical Society of America

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