scholarly journals Extended cavity perturbation technique to determine the complex permittivity of dielectric materials

1995 ◽  
Vol 43 (11) ◽  
pp. 2633-2636 ◽  
Author(s):  
Binshen Meng ◽  
J. Booske ◽  
R. Cooper
Keyword(s):  
Complex Permittivity ◽  
Perturbation Technique ◽  
Dielectric Materials ◽  
Cavity Perturbation ◽  
Extended Cavity

Measurement of Complex Permittivity of Materials Using a Double-Ridge Waveguide Resonator

2016 ◽  
Vol 723 ◽  
pp. 154-159
Author(s):  
En Li ◽  
Shu Ke Hao ◽  
Yun Peng Zhang ◽  
Yong Gao
Keyword(s):  
Complex Permittivity ◽  
Dielectric Material ◽  
Perturbation Technique ◽  
Dielectric Materials ◽  
Test System ◽  
Ridge Waveguide ◽  
Simulation Software ◽  
Experimental Result ◽  
Waveguide Resonator ◽  
Double Ridge

A double-ridge waveguide resonator loaded with rod like dielectric material was analyzed based on the electromagnetic simulation software HFSS and microwave resonant cavity perturbation technique in this paper. The perturbation method is used to calculate the complex permittivity of the material due to the change of the resonator's tiny change. The calculation expression of complex permittivity was deduced and proper test system was built for the validation at several specific frequencies, the resonant parameters of the cavity were measured by the external Agilent vector network analyzer, according to the calibration of standard quartz sample, the complex permittivity of the quartz, sapphire and PTFE samples were calculated. Experimental result showed that the method has a good performance for measuring the complex permittivity of low dielectric loss dielectric materials.

scholarly journals Nondestructive, Microwave Testing of Compression Strength and Moisture Content of Green Molding Sands

2021 ◽  
Vol 40 (4) ◽  
Author(s):  
Beata Gal ◽  
Daniel Nowak
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Water Content ◽  
Compression Strength ◽  
Complex Permittivity ◽  
Perturbation Technique ◽  
Testing Method ◽  
Cavity Perturbation ◽  
Permittivity Measurements

AbstractA nondestructive microwave testing method to control the green compression strength and moisture content was proposed and demonstrated. There are various green moulding sands, both qualitative (bentonite type) and quantitative (bentonite and water content), prepared. The permittivity measurements were performed by cavity perturbation technique (CPT) at 2.45 GHz. Relative complex permittivity of the bentonite bonded moulding sands is proportional to the bentonite and moisture content and is inversely proportional to green compressive strength. It was shown that the obtained permittivity value of the molding sands be used to investigate the green compression strength and moisture content.

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