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.

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.

Usage and Experimental Tests of the Modified Waveguide Method for Measurement of the Complex Permittivity and Permeability of Materials

2019 ◽  
Vol 27 (4) ◽  
pp. 299-306 ◽  
Author(s):  
M. P. Parkhomenko ◽  
D. S. Kalenov ◽  
I. S. Eremin ◽  
N. A. Fedoseev ◽  
V. M. Kolesnikova ◽  
...  
Keyword(s):  
Complex Permittivity ◽  
Experimental Tests ◽  
Permittivity And Permeability ◽  
Waveguide Method

scholarly journals Anisotropy Characterization of Metallic Lens Structures

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1114
Author(s):  
Yosef T. Aladadi ◽  
Majeed A. S. Alkanhal
Keyword(s):  
Impedance Matching ◽  
Wave Impedance ◽  
Reflection Coefficients ◽  
Lens Design ◽  
Anisotropic Behavior ◽  
Cell Parameters ◽  
Transmission And Reflection Coefficients ◽  
Permittivity And Permeability ◽  
Transmission And Reflection

This paper presents a full electromagnetic (EM) characterization of metallic lenses. The method is based on the utilization of free-space transmission and reflection coefficients to accurately obtain lenses’ tensorial EM parameters. The applied method reveals a clear anisotropic behavior with a full tensorial directional permittivity and permeability and noticeably dispersive permeability and wave impedance. This method yields accurate values for the effective refractive index, wave impedance, permittivity, and permeability, unlike those obtained by simple methods such as the eigenmode method. These correct cell parameters affect their lens performance, as manifested in a clear level of anisotropy, impedance matching, and losses. The effect of anisotropy caused by oblique incidence on the performance and operation of lens designs is illustrated in a lens design case.

A Position-Independent Reflection-Only Method for Complex Permittivity and Permeability Determination with One Sample

Frequenz ◽  
2020 ◽  
Vol 74 (3-4) ◽  
pp. 163-167
Author(s):  
Chuang Yang
Keyword(s):  
Magnetic Material ◽  
Complex Permittivity ◽  
Acrylonitrile Butadiene Styrene ◽  
Reflection Coefficients ◽  
Network Analyzer ◽  
Independent Reflection ◽  
X Band ◽  
Permittivity And Permeability ◽  
Good Agreement ◽  
Butadiene Styrene

AbstractThis paper presents a position-independent reflection-only method for determining complex permittivity and permeability of a sample. In this method, both the short and match calibration kits are used to measure the reflection coefficients. Only one sample positioned arbitrarily is measured using a one-port vector network analyzer (VNA), while the complex permittivity and permeability of the sample are determined simultaneously. Experimental results in X-band for the Acrylonitrile Butadiene Styrene plastic (ABS) are included to exhibit the validity of the proposed method. The results show that the complex permittivity and permeability determined by the proposed method have a good agreement with the parameters determined by the well-known Nicolson–Ross–Weir (NRW) method. In addition, a magnetic material is simulated to further validate the proposed method.

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