Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator

2021 ◽  
Vol 22 (9) ◽  
pp. 1270-1276
Author(s):  
Xingye Fan ◽  
Ruozhou Li ◽  
Jing Yan ◽  
Yuming Fang ◽  
Ying Yu
Keyword(s):  
Liquid Crystal ◽  
Coplanar Waveguide ◽  
Stepped Impedance Resonator

A multi-layered tunable stepped-impedance resonator for liquid crystal characterization

2012 ◽  
Author(s):  
Pouria Yaghmaee ◽  
Ali K. Horestani ◽  
Bevan Bates ◽  
Christophe Fumeaux
Keyword(s):  
Liquid Crystal ◽  
Stepped Impedance Resonator ◽  
Crystal Characterization

scholarly journals Liquid Crystal-Based Enclosed Coplanar Waveguide Phase Shifter for 54–66 GHz Applications

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 650 ◽  
Author(s):  
Jinfeng Li ◽  
Daping Chu
Keyword(s):  
Liquid Crystal ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Time Domain Reflectometry ◽  
Device Fabrication ◽  
Metallic Surface ◽  
Volume Distribution ◽  
60 Ghz ◽  
Phase Tuning ◽  
Tunable Dielectrics

A 0–10 V bias voltage-driven liquid crystal (LC) based 0°–180° continuously variable phase shifter was designed, fabricated, and measured with insertion loss less than −4 dB across the spectrum from 54 GHz to 66 GHz. The phase shifter was structured in an enclosed coplanar waveguide (ECPW) with LC as tunable dielectrics encapsulated by a unified ground plate in the design, which significantly reduced the instability due to floating effects and losses due to stray modes. By competing for spatial volume distribution of the millimeter-wave signal occupying lossy tunable dielectrics versus low-loss but non-tunable dielectrics, the ECPW’s geometry and materials are optimized to minimize the total of dielectric volumetric loss and metallic surface loss for a fixed phase-tuning range. The optimized LC-based ECPW was impedance matched with 1.85 mm connectors by the time domain reflectometry (TDR) method. Device fabrication featured the use of rolled annealed copper foil of lowest surface roughness with nickel-free gold-plating of optimal thickness. Measured from 54 GHz to 66 GHz, the phase shifter prototype presented a tangible improvement in phase shift effectiveness and signal-to-noise ratio, while exhibiting lower insertion and return losses, more ease of control, and high linearity as well as lower-cost fabrication as compared with up-to-date documentations targeting 60 GHz applications.

Design of filtering tunable liquid crystal phase shifter based on coplanar waveguide and split-ring resonators

2019 ◽  
Vol 46 (15) ◽  
pp. 2127-2133
Author(s):  
Chang Ding ◽  
Fan-Yi Meng ◽  
Hui-Lin Mu ◽  
Jian-Qiao Han ◽  
Chuan-Hong Zhao ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Ring Resonators ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Split Ring ◽  
Split Ring Resonators

Liquid-Crystal-Based Floating-Electrode-Free Coplanar Waveguide Phase Shifter with an Additional Liquid-Crystal Layer for 28-GHz Applications

2021 ◽  
Author(s):  
Junseok Ma ◽  
Jin Young Choi ◽  
Seung-Won Oh ◽  
Wook-Sung Kim
Keyword(s):  
Liquid Crystal ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Characteristic Impedance ◽  
Thickness Variation ◽  
Driving Voltage ◽  
Electrode Thickness ◽  
Electric Flux ◽  
First Time ◽  
Floating Electrode

Abstract A liquid-crystal (LC)-based floating electrode-free (FE-free) coplanar waveguide (CPW) phase shifter with an additional LC layer is demonstrated for the first time. An LC layer is overlain on the electrodes of the original model; this change increases the amount of electric flux that the proposed structure can confine in the tunable region, and thereby greatly increases the figure-of-merit (FoM) while maintaining the benefits of the simple coplanar structure. We simulated the variations in the phase shifter’s FoM, characteristic impedance, and driving voltage while sweeping the additional LC layer thickness up to 300 μm with each electrode condition at 28 GHz. In the case of electrode thickness variation, the FoM increased as electrode thickness increased, regardless of the presence of the additional LC layer. However, in the case of the signal electrode width variation, we obtained an opposite FoM tendency depending on the presence of the additional LC layer. This work shows the possibility of an efficient LC-based FE-free CPW phase shifter design for a given LC layer and electrode conditions.

Improvement of Phase-Shifting Properties in Coplanar Waveguide-Type Liquid Crystal Millimeter-Wave Phase Shifter by Introducing a Resonant Phenomenon

2008 ◽  
Vol 47 (11) ◽  
pp. 8483-8486 ◽  
Author(s):  
Toshiaki Nose ◽  
Susumu Yanagihara ◽  
Yukiko Sato ◽  
Ryota Ito ◽  
Michinori Honma
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Phase Shifting ◽  
Resonant Phenomenon ◽  
Wave Phase ◽  
Waveguide Type

Improvement of decay time in nematic-liquid-crystal-loaded coplanar-waveguide-type microwave phase shifter by polymer stabilizing method

2013 ◽  
Vol 53 (1S) ◽  
pp. 01AE08 ◽  
Author(s):  
Thanh Nguyen ◽  
Shuhei Umeno ◽  
Hiroki Higuchi ◽  
Hirotsugu Kikuchi ◽  
Hiroshi Moritake
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Decay Time ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Microwave Phase Shifter ◽  
Waveguide Type

scholarly journals Effective dielectric constant of top grounded coplanar waveguide on liquid crystal superstrate

2013 ◽  
Vol 55 (6) ◽  
pp. 1416-1418 ◽  
Author(s):  
Senad Bulja ◽  
Dariush Mirshekar‐Syahkal ◽  
Richard James ◽  
Sally E. Day ◽  
F.Aníbal Fernández
Keyword(s):  
Dielectric Constant ◽  
Liquid Crystal ◽  
Coplanar Waveguide ◽  
Effective Dielectric Constant
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