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A simple method of producing far-infrared high-pass filters

URN to cite this document:
urn:nbn:de:bvb:355-epub-170703
Huggard, P. G. ; Schneider, G. ; Prettl, Wilhelm ; Blau, W.
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Date of publication of this fulltext: 18 Oct 2010 11:35


Abstract

A method of making high-pass waveguide filters for the far infrared is described. The filters are formed from arrays of tightly packed narrow-bore metal tubes. Such filters feature sharp cut-off transitions in the region between 20 cm-1 and 40 cm-1. Transmission above cut-off is comparable to that in similar filters produced by drilling holes in thin metal sheets. Typically the transmissions just above cut-off are about 5% while that just below was measured as less than 0.1%.


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