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. 2018 Oct 10;9:4202. doi: 10.1038/s41467-018-06463-z

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Characterization of a single capillary filter. a FEM simulations and b experimental results for the case when the metal plug is in the beam path. A narrow resonant peak is observed at 123 GHz, as this frequency is coupled to the lower waveguide and emerges through Port 3 (red curves), with a corresponding dip in the signal emerging from Port 2 (blue curves). c The isolation ratio (Port 3/Port 2) reaches nearly +40 dB at the resonance frequency