Liquid Crystal Microstrip Prototipe S-Parameter Measurements

Citation Author(s):
Pablo
Mateos-Ruiz
Telecommunication Research Institute (TELMA), Universidad de Málaga
Submitted by:
Pablo Mateos-Ruiz
Last updated:
Fri, 12/01/2023 - 07:03
DOI:
10.21227/7axm-6b05
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Abstract 

This paper presents a method for effectively characterizing the dielectric permittivity of nematic liquid crystals across a broad frequency range. These materials show significant potential for reconfigurable devices operating in microwave and millimeter-wave frequencies. To achieve this goal, an additive manufacturing technique is used to create a microstrip line that can be filled with liquid that acts as its substrate. The liquid crystal is then biased to modulate its permittivity. After manufacturing, a time-gating approach is used to extract the permittivity, eliminating the need for TRL calibration. Finally, the approach is validated through simulations and experimental results, which closely align with those reported using other methods in the bibliography.

Instructions: 

The zip file contains s2p files from the measurements of the prototype in the different pool scenarios:

  • 'MSLC_Air.s2p' contains the S-parameter measurements for the case where the pool is not filled with liquid cristal yet.
  • Folder '20 Vpp Bias' contains .s2p files with the S-parameters measured when the pool is filled with liquid crystal and is being polarized with a 20Vpp AC signal. The filenames indicate the time passed since the ON/OFF states started.
  • Folder '100 Vpp Bias' is the same as the previous one, but using a 100Vpp AC signal.
Funding Agency: 
Spanish Ministerio de Universidades
Grant Number: 
RTI2018-097098-J-I00