scholarly journals Wideband Reconfigurable Millimeter-Wave Linear Array Antenna Using Liquid Crystal for 5G Networks

2021 ◽  
Vol 12 (01) ◽  
pp. 1-14
Author(s):  
Ali El Hajj Hassan ◽  
Najib Fadlallah ◽  
Mohammad Rammal ◽  
Georges Zakka El Nashef ◽  
Elias Rachid
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Linear Array ◽  
Array Antenna ◽  
5G Networks

LTCC Partially-Filled Post-Wall Rectangular-Waveguide Slot Array Antenna in the Millimeter-Wave Band

2012 ◽  
Vol E95.C (10) ◽  
pp. 1635-1642 ◽  
Author(s):  
Yuanfeng SHE ◽  
Jiro HIROKAWA ◽  
Makoto ANDO ◽  
Daisuke HANATANI ◽  
Masahiro FUJIMOTO
Keyword(s):  
Millimeter Wave ◽  
Rectangular Waveguide ◽  
Array Antenna ◽  
Wave Band ◽  
Waveguide Slot ◽  
Millimeter Wave Band

Planar Dual-Polarization Bidirectional Multibeam Array Antenna for Millimeter-Wave Applications

2021 ◽  
pp. 1-1
Author(s):  
Qiang Sun ◽  
Yong-Ling Ban ◽  
Ji-Wei Lian ◽  
Yong Yang ◽  
Gang Wu ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Array Antenna ◽  
Dual Polarization

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.

Millimeter-wave beam former using liquid crystal

2005 ◽  
Vol 88 (8) ◽  
pp. 10-18 ◽  
Author(s):  
Hirokazu Kamoda ◽  
Takao Kuki ◽  
Hideo Fujikake ◽  
Toshihiro Nomoto
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Wave Beam

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
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