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

scholarly journals Temperature Characterization of Liquid Crystal Dielectric Image Line Phase Shifter for Millimeter-Wave Applications

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 63
Author(s):  
Henning Tesmer ◽  
Rani Razzouk ◽  
Ersin Polat ◽  
Dongwei Wang ◽  
Rolf Jakoby ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Insertion Loss ◽  
Phase Shifter ◽  
Ground Plane ◽  
Temperature Dependent ◽  
Differential Phase ◽  
Dependent Behavior ◽  
The Impact ◽  
Temperature Dependent Behavior

In this paper we investigate the temperature dependent behavior of a liquid crystal (LC) loaded tunable dielectric image guide (DIG) phase shifter at millimeter-wave frequencies from 80 GHz to 110 GHz for future high data rate communications. The adhesive, necessary for precise fabrication, is analyzed before temperature dependent behavior of the component is shown, using the nematic LC-mixture GT7-29001. The temperature characterization is conducted by changing the temperature of the LC DIG’s ground plane between −10∘C and 80 ∘C. The orientation of the LC molecules, and therefore the effective macroscopic relative permittivity of the DIG, is changed by inserting the temperature setup in a fixture with rotatable magnets. Temperature independent matching can be observed, while the insertion loss gradually increases with temperature for both highest and lowest permittivity of the LC. At 80 ∘C the insertion loss is up to 1.3dB higher and at −10∘C it is 0.6dB lower than the insertion loss present at 20 ∘C. In addition, the achievable differential phase is reduced with increasing temperature. The impact of molecule alignment to this reduction is shown for the phase shifter and an estimated 85% of the anisotropy is still usable with an LC DIG phase shifter when increasing the temperature from 20 ∘C to 80 ∘C. Higher reduction of differential phase is present at higher frequencies as the electrical length of the phase shifter increases. A maximum difference in differential phase of 72∘ is present at 110 GHz, when increasing the temperature from 20 ∘C to 80 ∘C. Nevertheless, a well predictable, quasi-linear behavior can be observed at the covered temperature range, highlighting the potential of LC-based dielectric components at millimeter wave frequencies.

Liquid crystal millimeter wave electronic phase shifter

1993 ◽  
Vol 62 (10) ◽  
pp. 1065-1067 ◽  
Author(s):  
K. C. Lim ◽  
J. D. Margerum ◽  
A. M. Lackner
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Phase Shifter ◽  
Electronic Phase

Millimeter-wave phase shifter based on waveguide-mounted RF-MEMS

2013 ◽  
Vol 55 (3) ◽  
pp. 465-468 ◽  
Author(s):  
Dimitra Psychogiou ◽  
Yunjia Li ◽  
Jan Hesselbarth ◽  
Stephane Kühne ◽  
Dimitrios Peroulis ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Phase Shifter ◽  
Rf Mems ◽  
Wave Phase
Sign in / Sign up

Export Citation Format

Share Document