Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications

J. F. Li; H. Xu; D. P. Chu

doi:10.1109/EuMC.2016.7824526

Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications

J. F. Li
, H. Xu
, D. P. Chu

University of Cambridge

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

38 Citations (Scopus)

Abstract

A continuously tunable millimeter wave (mm-wave) phase shifter for 60-90 GHz applications was proposed using a coplanar waveguide (CPW) structure without the use of a floating electrode (FE). In contrast to conventional CPW-FE structures, the proposed FE-free CPW device can be modulated by the nematic liquid crystal (LC) materials confined in two symmetric feeding channels. The nearly true-TEM nature of this CPW design enables wideband and low-loss operations, particularly in high frequencies up to 90 GHz. In order to optimize between high tunability and low loss, the aspect ratio of the CPW structure was optimized to maximize the defined Figure-of-Merit (FoM). By taking into account different loss mechanisms in the designed structure and the effect of LC orientations, the driving-voltage dependent impedance matching was examined to minimize the return and insertion losses. As an example, the design of a phase shifter aimed to operate at 79 GHz with low bias voltages (0-10 V) is presented, showing a wide phase shift range of 0-408° and a low insertion loss from -6.15dB to -4.56dB. The corresponding FoM is 66.3°/dB, which make it possible to outperform over other LC-based phase shifters as reported within the targeted frequency range of 60-90 GHz.

Original language	English
Title of host publication	European Microwave Week 2016
Subtitle of host publication	"Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1047-1050
Number of pages	4
ISBN (Electronic)	9782874870439
DOIs	https://doi.org/10.1109/EuMC.2016.7824526
Publication status	Published - 2016
Externally published	Yes
Event	46th European Microwave Conference, EuMC 2016 - London, United Kingdom Duration: 4 Oct 2016 → 6 Oct 2016

Publication series

Name	European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016

Conference

Conference	46th European Microwave Conference, EuMC 2016
Country/Territory	United Kingdom
City	London
Period	4/10/16 → 6/10/16

Keywords

Liquid crystal
Millimeter wave
Tunable phase shifter

Access to Document

10.1109/EuMC.2016.7824526

Cite this

Li, J. F., Xu, H., & Chu, D. P. (2016). Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications. In European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016 (pp. 1047-1050). Article 7824526 (European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/EuMC.2016.7824526

Li, J. F. ; Xu, H. ; Chu, D. P. / Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications. European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016. Institute of Electrical and Electronics Engineers Inc., 2016. pp. 1047-1050 (European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016).

@inproceedings{2112cc2b4d8e40c397ef086344338e60,

title = "Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications",

abstract = "A continuously tunable millimeter wave (mm-wave) phase shifter for 60-90 GHz applications was proposed using a coplanar waveguide (CPW) structure without the use of a floating electrode (FE). In contrast to conventional CPW-FE structures, the proposed FE-free CPW device can be modulated by the nematic liquid crystal (LC) materials confined in two symmetric feeding channels. The nearly true-TEM nature of this CPW design enables wideband and low-loss operations, particularly in high frequencies up to 90 GHz. In order to optimize between high tunability and low loss, the aspect ratio of the CPW structure was optimized to maximize the defined Figure-of-Merit (FoM). By taking into account different loss mechanisms in the designed structure and the effect of LC orientations, the driving-voltage dependent impedance matching was examined to minimize the return and insertion losses. As an example, the design of a phase shifter aimed to operate at 79 GHz with low bias voltages (0-10 V) is presented, showing a wide phase shift range of 0-408° and a low insertion loss from -6.15dB to -4.56dB. The corresponding FoM is 66.3°/dB, which make it possible to outperform over other LC-based phase shifters as reported within the targeted frequency range of 60-90 GHz.",

keywords = "Liquid crystal, Millimeter wave, Tunable phase shifter",

author = "Li, \{J. F.\} and H. Xu and Chu, \{D. P.\}",

note = "Publisher Copyright: {\textcopyright} 2016 EuMA.; 46th European Microwave Conference, EuMC 2016 ; Conference date: 04-10-2016 Through 06-10-2016",

year = "2016",

doi = "10.1109/EuMC.2016.7824526",

language = "English",

series = "European Microwave Week 2016: {"}Microwaves Everywhere{"}, EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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booktitle = "European Microwave Week 2016",

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}

Li, JF, Xu, H & Chu, DP 2016, Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications. in European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016., 7824526, European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016, Institute of Electrical and Electronics Engineers Inc., pp. 1047-1050, 46th European Microwave Conference, EuMC 2016, London, United Kingdom, 4/10/16. https://doi.org/10.1109/EuMC.2016.7824526

Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications. / Li, J. F.; Xu, H.; Chu, D. P.
European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016. Institute of Electrical and Electronics Engineers Inc., 2016. p. 1047-1050 7824526 (European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications

AU - Li, J. F.

AU - Xu, H.

AU - Chu, D. P.

PY - 2016

Y1 - 2016

N2 - A continuously tunable millimeter wave (mm-wave) phase shifter for 60-90 GHz applications was proposed using a coplanar waveguide (CPW) structure without the use of a floating electrode (FE). In contrast to conventional CPW-FE structures, the proposed FE-free CPW device can be modulated by the nematic liquid crystal (LC) materials confined in two symmetric feeding channels. The nearly true-TEM nature of this CPW design enables wideband and low-loss operations, particularly in high frequencies up to 90 GHz. In order to optimize between high tunability and low loss, the aspect ratio of the CPW structure was optimized to maximize the defined Figure-of-Merit (FoM). By taking into account different loss mechanisms in the designed structure and the effect of LC orientations, the driving-voltage dependent impedance matching was examined to minimize the return and insertion losses. As an example, the design of a phase shifter aimed to operate at 79 GHz with low bias voltages (0-10 V) is presented, showing a wide phase shift range of 0-408° and a low insertion loss from -6.15dB to -4.56dB. The corresponding FoM is 66.3°/dB, which make it possible to outperform over other LC-based phase shifters as reported within the targeted frequency range of 60-90 GHz.

AB - A continuously tunable millimeter wave (mm-wave) phase shifter for 60-90 GHz applications was proposed using a coplanar waveguide (CPW) structure without the use of a floating electrode (FE). In contrast to conventional CPW-FE structures, the proposed FE-free CPW device can be modulated by the nematic liquid crystal (LC) materials confined in two symmetric feeding channels. The nearly true-TEM nature of this CPW design enables wideband and low-loss operations, particularly in high frequencies up to 90 GHz. In order to optimize between high tunability and low loss, the aspect ratio of the CPW structure was optimized to maximize the defined Figure-of-Merit (FoM). By taking into account different loss mechanisms in the designed structure and the effect of LC orientations, the driving-voltage dependent impedance matching was examined to minimize the return and insertion losses. As an example, the design of a phase shifter aimed to operate at 79 GHz with low bias voltages (0-10 V) is presented, showing a wide phase shift range of 0-408° and a low insertion loss from -6.15dB to -4.56dB. The corresponding FoM is 66.3°/dB, which make it possible to outperform over other LC-based phase shifters as reported within the targeted frequency range of 60-90 GHz.

KW - Liquid crystal

KW - Millimeter wave

KW - Tunable phase shifter

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U2 - 10.1109/EuMC.2016.7824526

DO - 10.1109/EuMC.2016.7824526

M3 - Conference contribution

AN - SCOPUS:85015236763

T3 - European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016

SP - 1047

EP - 1050

BT - European Microwave Week 2016

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 46th European Microwave Conference, EuMC 2016

Y2 - 4 October 2016 through 6 October 2016

ER -

Li JF, Xu H, Chu DP. Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications. In European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016. Institute of Electrical and Electronics Engineers Inc. 2016. p. 1047-1050. 7824526. (European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016). doi: 10.1109/EuMC.2016.7824526

Design of liquid crystal based coplanar waveguide tunable phase shifter with no floating electrodes for 60-90 GHz Applications

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