Schottky-biased, optically controlled coplanar waveguide phase-shifter

1989 ◽  
Vol 25 (19) ◽  
pp. 1301 ◽  
Author(s):  
P. Cheung ◽  
D.P. Neikirk ◽  
T. Itoh
Keyword(s):  
Phase Shifter ◽  
Coplanar Waveguide

An Application of a Low-Loss MOD-Made BST Film Developed Especially with PLD Initial Nucleation Layer to a 20 GHz Tunable Phase Shifter

2004 ◽  
Vol 833 ◽  
Author(s):  
Minoru Noda ◽  
Daniel Popovici ◽  
Masanori Okuyama ◽  
Yoshinobu Sasaki ◽  
Makio Komaru
Keyword(s):  
Thin Films ◽  
Phase Shift ◽  
Phase Shifter ◽  
Coplanar Waveguide ◽  
Final Thickness ◽  
Nucleation Layer ◽  
Differential Phase Shift ◽  
Bst Thin Films ◽  
Main Layer ◽  
Initial Layer

ABSTRACTBarium Strontium Titanate (BST) thin films have been deposited on (100)-oriented MgO substrate by combining preparation of initial layer by Pulsed Laser Deposition and main layer by Metal-Organic-Decomposition method. Films with an initial layer of 20, 30 and 40 nm thickness and final thickness of 400, 650 and 800 nm have been obtained. Physical and dielectric properties of the BST thin films have been characterized from the viewpoint of frequency-agile micro and millimeter wave circuit applications. The results reveal that Ba0.6Sr0.4TiO3 thin films have a good crystallinity with characteristic orientation that is affected by the deposition conditions of the initial layer. Interdigital capacitor with a gap of 10 μm has been characterized and the dielectric loss and tunability are as low as 0.002 to 0.004 and 12%, respectively, at frequency of 1 MHz for the applied voltage from -/+40V to +/-40V. At microwave frequencies, classical coplanar waveguide lines formed on BST/(100)MgO were investigated. A differential phase shift of 18 degree was obtained at 20 GHz with insertion loss of about −2 dB at 60 V for Au/Cr interconnection. Finally, a 3-stage LC-ladder-type phase shifter with variable capacitors of BST thin film has been fabricated considering the experimental results obtained for the coplanar waveguide lines and a maximum phase shift of 40 degrees is obtained at 20 GHz at 60 V.

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

Design & Modeling of 6-Bit Low Loss Ka Band Distributed MEMS Phase Shifter on GaAs

2011 ◽  
Vol 403-408 ◽  
pp. 4179-4183
Author(s):  
Anesh K. Sharma ◽  
Ashu K. Gautam ◽  
D.V.K. Sastry ◽  
S.G. Singh
Keyword(s):  
Phase Shift ◽  
Insertion Loss ◽  
Phase Shifter ◽  
Structural Parameters ◽  
Coplanar Waveguide ◽  
Actuation Voltage ◽  
Ka Band ◽  
Rf Systems ◽  
Total Phase ◽  
Digital Phase Shifter

This paper presents the design & modeling of distributed MEMS phase shifter for Ka band RF systems. The phase shift can be achieved by periodically placing the MEMS bridge variable capacitors as per Bragg frequency criteria on coplanar waveguide (CPW) using GaAs substrate. The EM & electromechanical simulation are carried out with various structural parameters to optimize the designs. The novelties like low insertion loss, low actuation voltage with distributed actuation pads & separate DC and RF are used to make the design unique. The EM simulations are carried out with HFSS and an insertion loss of -3.49 dB at 36GHz for a total Phase shift of 360 deg. was achieved with return loss of - 20.6 dB over a frequency band 34-38 GHz. The electromechanical simulations are carried to achieve the low actuation voltage of 10.3V. The significance of this study is the realization of the digital phase shifter through DMTL approach.

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