Non-destructive measurement of complex permittivity of dielectric slabs

Cheng Guoxin; Yuan Chengwei; Liu Lie

doi:10.3788/HPLPB20132508.2045

Volume 25 Issue 08

Nov. 2013

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(08): 2045-2049

He Minbo, Jiang Houman. Scaling law in thermal deformation of high reflecting mirror under laser irradiation[J]. High Power Laser and Particle Beams, 2012, 24: 2043-2046. doi: 10.3788/HPLPB20122409.2043

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Cheng Guoxin, Yuan Chengwei, Liu Lie. Non-destructive measurement of complex permittivity of dielectric slabs[J]. High Power Laser and Particle Beams, 2013, 25: 2045-2049. doi: 10.3788/HPLPB20132508.2045

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Non-destructive measurement of complex permittivity of dielectric slabs

doi: 10.3788/HPLPB20132508.2045

1.
College of Opto-electric Science and Engineering,National University of Defense Technology,Changsha 410073,China

Received Date: 2012-12-14
Rev Recd Date: 2013-03-18
Publish Date: 2013-06-19

Abstract

Abstract

Based on the traditional TE01n cylindrical cavity, a new resonator is proposed for non-destructive measurements of the complex permittivity of dielectric slabs. It consists of a large planar metal plate, a dielectric slab, and a cylindrical waveguide armed with a flange at one end and a tunable piston at another end. The dielectric slab is sandwiched between the metal plate and the flange. The rigorous mode matching method is employed for analyzing the electric fields in the cavity. Expressions relating the complex permittivity with the cavitys physical dimensions and the measured S21 parameter are developed. Thereafter, several dielectric slabs are tested to demonstrate the usefulness of this proposed method. It is found that by using this cavity, the measurement uncertainty for the relative permittivity is within 1%, while the measurement uncertainty for the dielectric loss could not exceed 10%. This cavity has the advantage of measuring the complex permittivity at multiple resonant modes. Therefore, it could be used as a robust approach for characterizing the frequency dependence of the complex permittivity of dielectric slabs.
- dielectric material,
- non-destructive measurement,
- complex permittivity,
- resonator,
- quality factor

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