W-band phase shifter based on optimized optically controlled carbon nanotube layer

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Research units

  • Royal Institute of Technology


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.


Original languageEnglish
Title of host publication2017 IEEE MTT-S International Microwave Symposium, IMS 2017
Publication statusPublished - 4 Oct 2017
MoE publication typeA4 Article in a conference publication
EventIEEE MTT-S International Microwave Symposium - Honololu, United States
Duration: 4 Jun 20179 Jun 2017

Publication series

NameIEEE MTT-S International Microwave Symposium digest
ISSN (Print)0149-645X


ConferenceIEEE MTT-S International Microwave Symposium
Abbreviated titleIMS
CountryUnited States

    Research areas

  • Car-bon nanotubes, Dielectric rod waveguide, Millimeter waves, Optically controlled varactor, Phase shifter

ID: 16072504