Design of a microwave variable delay line using liquid crystal, and a study of its insertion loss

2002 ◽  
Vol 85 (2) ◽  
pp. 36-42 ◽  
Author(s):  
Takao Kuki ◽  
Hideo Fujikake ◽  
Toshihiro Nomoto ◽  
Yozo Utsumi
Keyword(s):  
Liquid Crystal ◽  
Insertion Loss ◽  
Delay Line ◽  
Variable Delay

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.

Variable Delay Line

1973 ◽  
Author(s):  
F.Y. Cho ◽  
B.J. Hunsinger
Keyword(s):  
Delay Line ◽  
Variable Delay

A tapped electronically variable delay line suitable for integrated circuits

1966 ◽  
Vol 54 (8) ◽  
pp. 1118-1119 ◽  
Author(s):  
B.D. Anderson ◽  
D.M. Brady ◽  
W. New ◽  
R. Newcomb
Keyword(s):  
Integrated Circuits ◽  
Delay Line ◽  
Variable Delay

Variable delay line for phased-array antenna based on a chirped fiber grating

2000 ◽  
Vol 48 (8) ◽  
pp. 1352-1360 ◽  
Author(s):  
B. Ortega ◽  
J.L. Cruz ◽  
J. Capmany ◽  
M.V. Andres ◽  
D. Pastor
Keyword(s):  
Phased Array ◽  
Delay Line ◽  
Array Antenna ◽  
Fiber Grating ◽  
Variable Delay ◽  
Phased Array Antenna ◽  
Chirped Fiber Grating

Discontinuous Low-frequency Delay Line with Continuously Variable Delay

Nature ◽  
1952 ◽  
Vol 169 (4291) ◽  
pp. 148-149 ◽  
Author(s):  
J. M. L. JANSSEN
Keyword(s):  
Delay Line ◽  
Low Frequency ◽  
Variable Delay

Development of a Hermetically Sealed Enclosure for MEMS in Chip-on-Flex Modules Using Liquid Crystalline Polymer (LCP)

2005 ◽  
Author(s):  
Morgan Chen ◽  
Nicole Evers ◽  
Chris Kapusta ◽  
Joe Iannotti ◽  
Anh-Vu Pham ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Low Temperature ◽  
Insertion Loss ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Microelectromechanical System ◽  
Mems Switch ◽  
Crystal Polymer ◽  
X Band

We present the development of a hermetic shield packaging enclosure for RF microelectromechanical system switches (MEMS) using Liquid Crystal Polymer (LCP). A cavity formed in LCP has been laminated, at low temperature, onto a Si MEMS switch to create a hermetically sealed package. The hermetically sealed enclosure is a stack-up layer of the multi-layer organic chip-on-flex system-on-a-package (SOP). The entire SOP hermetically sealed package has a total insertion loss of ∼0.5 dB at X-band. E595 outgas tests demonstrate that the LCP package is reliable and hermetically protects the MEMS switch.

Two−port cavity resonator low−insertion−loss delay line

1975 ◽  
Vol 26 (7) ◽  
pp. 364-365 ◽  
Author(s):  
T. R. Joseph ◽  
K. M. Lakin
Keyword(s):  
Insertion Loss ◽  
Delay Line ◽  
Cavity Resonator ◽  
Low Insertion Loss
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