Complex Permittivity and Permeability Measurement Method of Multiple Free-Space Incident for Structured Absorbing Materials

2017 ◽  
Author(s):  
Li Liangtao ◽  
Liu Jun ◽  
Qu Liyong ◽  
Ma Yao
Keyword(s):  
Complex Permittivity ◽  
Free Space ◽  
Measurement Method ◽  
Permeability Measurement ◽  
Absorbing Materials ◽  
Permittivity And Permeability

Electromagnetic Characteristics of Iron-Based Microwave Absorbing Materials

2011 ◽  
Vol 479 ◽  
pp. 106-111
Author(s):  
R.B. Yang ◽  
K.Y. Juan ◽  
Chien Yie Tsay ◽  
W.F. Liang ◽  
Chung Kwei Lin
Keyword(s):  
Complex Permittivity ◽  
Resonant Cavity ◽  
Electromagnetic Properties ◽  
Frequency Range ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Permittivity And Permeability ◽  
Electromagnetic Characteristics ◽  
Iron Based ◽  
Microwave Absorbing

Nowadays human are exposed to an environment filling with electromagnetic waves over a wide frequency range. The electromagnetic properties of microwave absorbing materials plays an important role in the performance of civilian electromagnetic interference (EMI) shielding at low frequency range and military stealth technology at high frequency one. The electromagnetic properties include complex permittivity and permeability and its combination determines the electromagnetic wave absorption ability of a material. Complex permittivity and permeability can be measured by three different methods, i.e., free-space method, coaxial/waveguide method, and resonant cavity perturbation method. The first one requires a large space, expensive equipment, and not suitable for academic usage. In the present study, using coaxial/waveguide and resonant cavity perturbation methods, electromagnetic characteristics of iron-based microwave absorbing materials will be obtained and its microwave absorption performance will be investigated. In addition, a comparison between the measurements by these two methods will be addressed.

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.

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