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Low-pass RC filter modified by liquid crystal exhibiting one Debye relaxation - theoretical approach

Paweł J. Perkowski
Opto-Electronics Review | 2022 | 30 | 3 | e141949 | DOI: 10.24425/opelre.2022.141949
Keywords liquid crystal impedance analysis low-frequency filter dielectric relaxation permittivity
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Abstract

The solid dielectrics used in the capacitors exhibit rather high-frequency relaxations. This means that in the radio-frequency range, the capacitors exhibit a constant capacity. When a liquid crystal is put into the capacitors, it is observed that in the radio-frequency range the capacity changes (decreases with frequency). This is due to the fact that liquid crystals exhibit relaxation in the radio-frequency range. In this paper, the formulas for the electric response of a low-frequency RC filter with liquid crystal characterized by complex electric permittivity are derived. One Debye-type relaxation is assumed in the calculations. The influence of strengths and relaxation time (frequency) of relaxation mode in liquid crystal on the electric response of low-frequency filters is discussed.
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Authors and Affiliations

Paweł J. Perkowski
1
ORCID: ORCID
  1. Institute of Applied Physics, Military University of Technology, 2 gen. Kaliskiego St., 00-908 Warsaw, Poland

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