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W-band phase shifter based on optimized optically controlled carbon nanotube layer
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0003-3339-9137
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2017 (English)In: 2017 IEEE MTT-S International Microwave Symposium (IMS), Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 1188-1191, article id 8058815Conference paper, Published paper (Refereed)
Abstract [en]

Phase shifting in a dielectric rod waveguide (DRW), loaded with carbon nanotube (CNT) layers of different thickness, was studied experimentally under light illumination in the frequency range of 75-110 GHz. The dependence of efficiency of the phase shifting, in terms of phase shift per light intensity and millimeter wave attenuation, on the optical transparency of the CNT-layer is investigated in this paper. The best result, a phase shifter of 0-15° with less than 0.1 dB additional signal loss in the W-band was achieved for a 95% transparent CNT layer at 23 mW/mm2 light intensity of a tungsten halogen lamp (main radiation spectrum is 550-680 nm). The overall insertion loss of the phase shifter including two DRW tapering sections serving as transitions to rectangular waveguides are 3 to 5 dB in the W-band, about 2 dB is attributed to the CNT DRW section. This comprises, for the first time, an optically-controlled CNT-based DRW phase shifter with phase shift and insertion loss levels suitable for practical applications.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017. p. 1188-1191, article id 8058815
Series
IEEE MTT-S International Microwave Symposium Digest, ISSN 0149-645X
Keywords [en]
Car-bon nanotubes, Dielectric rod waveguide, Millimeter waves, Optically controlled varactor, Phase shifter
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-217564DOI: 10.1109/MWSYM.2017.8058815ISI: 000425241500318Scopus ID: 2-s2.0-85032496992ISBN: 9781509063604 OAI: oai:DiVA.org:kth-217564DiVA, id: diva2:1158009
Conference
2017 IEEE MTT-S International Microwave Symposium, IMS 2017, Honololu, United States, 4 June 2017 through 9 June 2017
Funder
EU, Horizon 2020, 675683
Note

QC 20171117

Available from: 2017-11-17 Created: 2017-11-17 Last updated: 2018-03-23Bibliographically approved

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Oberhammer, Joachim

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