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Ridge Gap Waveguide Based Liquid Crystal Phase Shifter

Nickel, Matthias ; Jimenez-Saez, Alejandro ; Agrawal, Prannoy ; Gadallah, Ahmed ; Malignaggi, Andrea ; Schuster, Christian ; Reese, Roland ; Tesmer, Henning ; Polat, Ersin ; Wang, Dongwei ; Schumacher, Peter ; Jakoby, Rolf ; Kissinger, Dietmar ; Maune, Holger (2021):
Ridge Gap Waveguide Based Liquid Crystal Phase Shifter. (Publisher's Version)
In: IEEE Access, 8, pp. 77833-77842. ISSN 2169-3536,
DOI: 10.26083/tuprints-00017844,

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Ridge Gap Waveguide Based Liquid Crystal Phase Shifter
Language: English

In this paper, the gap waveguide technology is examined for packaging liquid crystal (LC) in tunable microwave devices. For this purpose, a line based passive phase shifter is designed and implemented in a ridge gap waveguide (RGW) topology and filled with LC serving as functional material. The inherent direct current (DC) decoupling property of gap waveguides is used to utilize the waveguide surroundings as biasing electrodes for tuning the LC. The bed of nails structure of the RGW exhibits an E-field suppression of 76 dB in simulation, forming a completely shielded device. The phase shifter shows a maximum figure of merit (FoM) of 70 °/dB from 20 GHz to 30 GHz with a differential phase shift of 387° at 25 GHz. The insertion loss ranges from 3.5 dB to 5.5 dB depending on the applied biasing voltage of 0 V to 60 V.

Journal or Publication Title: IEEE Access
Volume of the journal: 8
Place of Publication: Darmstadt
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP)
Date Deposited: 23 Mar 2021 08:03
Last Modified: 25 Nov 2022 11:45
DOI: 10.26083/tuprints-00017844
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-178447
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/17844
PPN: 482001453
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