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Integrated Micromachined Waveguide Absorbers at 220 – 325 GHz
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0001-5662-6748
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0002-8514-6863
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0002-8264-3231
2017 (English)In: Proceedings of the 47th European Microwave Conference, Nuremberg, October 8-13, 2017, 2017Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the characterization of integrated micromachined waveguide absorbers in the frequency band of 220 to 325 GHz. Tapered absorber wedges were cut out of four different commercially available semi-rigid absorber ma terials and inserted in a backshorted micromachined waveguide cavity for characterization. The absorption properties of these materials are only specified at 10 GHz, and their absorption behavior above 100 GHz was so far unknown. To study the effect of the geometry of the absorber wedges, the return loss of different absorber lengths and tapering angles was investigated. The results show that longer and sharper sloped wedges from the material specified with the lowest dielectric constant, but not the highest specified absorption, are superior over other geometries and absorber materials. The best results were achieved for 5 mm long absorbers with a tapering angle of 23° in the material RS-4200 from the supplier Resin Systems, having a return loss of better than 13 dB over the whole frequency range of 220 to 325 GHz. These absorber wedges are intended to be used as matched loads in micromachined waveguide circuits. To the best of our knowledge, this is the first publication characterizing such micromachined waveguide absorbers.

Place, publisher, year, edition, pages
2017.
Keyword [en]
microwave absorbers, THz, micromachined waveguides, millimeter-wave, submillimeter-wave, matched load
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216955OAI: oai:DiVA.org:kth-216955DiVA: diva2:1152607
Conference
European Microwave Conference 2017
Projects
SSF Swedish Foundation for Strategic Research, Synergy Grant Electronics SEl3-007
Funder
Swedish Foundation for Strategic Research , SEl3-007EU, European Research Council, 616846
Note

QCR 20171031

Available from: 2017-10-25 Created: 2017-10-25 Last updated: 2017-10-31Bibliographically approved

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