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Waveguide cavity perturbation method for measuring complex permittivity of water
Author(s) -
Mathew K. T.,
Raveendranath U.
Publication year - 1993
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.4650060206
Subject(s) - permittivity , waveguide , perturbation (astronomy) , materials science , capillary action , optics , resonant cavity , network analyzer (electrical) , frequency band , acoustics , optoelectronics , physics , electronic engineering , dielectric , engineering , telecommunications , bandwidth (computing) , composite material , laser , quantum mechanics
An accurate method of measuring the complex permittivity of high‐loss liquids like water by use of a waveguide perturbation technique is presented. The sample taken in a thin capillary tube of low‐loss material is inserted in the S‐band waveguide cavity. Resonance frequency and frequency shift are measured with a H. P. network analyzer and the complex permittivity is calculated. This method is particularly useful in the case of high‐loss liquids. Another advantage of this method is that only a very small quantity of liquid is needed for the study. © 1993 John Wiley & sons, Inc.