scholarly journals Broad-band characterization of the complex permittivity and permeability of materials

10.2172/86964 ◽  
1994 ◽  
Author(s):  
C.A. Avalle
Keyword(s):  
Complex Permittivity ◽  
Broad Band ◽  
Permittivity And Permeability

A One-Port Waveguide Method and its Application in Characterization of Radar Absorbing Materials

2014 ◽  
Vol 496-500 ◽  
pp. 26-29
Author(s):  
Fei Zhao ◽  
Chang Tao Sha ◽  
Gang Zhao ◽  
Ke Wang ◽  
Jin Song Kan
Keyword(s):  
Error Analysis ◽  
Complex Permittivity ◽  
Reflection Coefficients ◽  
Phase Information ◽  
High Loss ◽  
Absorbing Materials ◽  
Permittivity And Permeability ◽  
Before And After ◽  
Waveguide Method

A one-port waveguide method and related apparatus based on the multi-state techniques is descried in this paper. This method measures only the magnitude and phase information for the reflection coefficients of four-state before and after the samples under test being loaded. On the basis of such data, the complex permittivity and permeability of the samples can be simultaneous calculated by software programmed according to the related theories discussed herein. In addition, the error analysis is also discussed in this paper. The proposed method is applicable to measure magnetic and/or medium-to high-loss materials, hence it is suitable to characterize the properties of radar absorbing materials.

scholarly journals Complex Permittivity Characterization of Liquid Samples Based on a Split Ring Resonator (SRR)

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3385
Author(s):  
Jialu Ma ◽  
Jingchao Tang ◽  
Kaicheng Wang ◽  
Lianghao Guo ◽  
Yubin Gong ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Complex Permittivity ◽  
Ring Resonator ◽  
High Sensitivity ◽  
Split Ring Resonator ◽  
Debye Model ◽  
Split Ring ◽  
Liquid Samples ◽  
Microwave Sensor

A complex permittivity characterization method for liquid samples has been proposed. The measurement is carried out based on a self-designed microwave sensor with a split ring resonator (SRR), the unload resonant frequency of which is 5.05 GHz. The liquid samples in capillary are placed in the resonant zone of the fabricated senor for high sensitivity measurement. The frequency shift of 58.7 MHz is achieved when the capillary is filled with ethanol, corresponding a sensitivity of 97.46 MHz/μL. The complex permittivity of methanol, ethanol, isopropanol (IPA) and deionized water at the resonant frequency are measured and calibrated by the first order Debye model. Then, the complex permittivity of different concentrations of aqueous solutions of these materials are measured by using the calibrated sensor system. The results show that the proposed sensor has high sensitivity and accuracy in measuring the complex permittivity of liquid samples with volumes as small as 0.13 μL. It provides a useful reference for the complex permittivity characterization of small amount of liquid chemical samples. In addition, the characterization of an important biological sample (inositol) is carried out by using the proposed sensor.

Sign in / Sign up

Export Citation Format

Share Document