A frequency-varying method for simultaneous measurement of complex permittivity and permeability with an open-ended coaxial probe

Wang, Shoujun; Maode, Niu; Xu, Deming

doi:10.1109/22.739296

Cited by 50 publications

(12 citation statements)

References 11 publications

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“…It is for this reason that the dual waveguide probe more accurately measures permeability than permittivity. Similar errors in permittivity measurements, for like measurement geometries, are noted by Wang et al [1998], Chen et al [2005], Stewart and Havrilla [2006], Maode et al [1999], Tantot et al [1997], Li and Chen [1995], and Courtney and Motil [1999]. Several of the researchers state the difficulty of obtaining accurate dielectric loss values (even physically realizable results) for low dielec- Figure 6.…”

Section: àJkrsupporting

confidence: 61%

“…Since these measurements are independent over all wavelengths and are observed simultaneously, no underdetermined optimization routines or additional measurements are required to extract permittivity and permeability [Baker-Jarvis et al, 1994;Chen et al, 2005;Maode et al, 1999;Stewart and Havrilla, 2006;Tantot et al, 1997;Wang et al, 1998]. The work presented in this paper also significantly extends that presented by Stewart and Havrilla [2007] by incorporating higher-order modes and probe alignment uncertainty.…”

Section: Resultsmentioning

confidence: 82%

“…While this scenario is well suited for determining complex permittivity of an unknown material, it presents challenges when one also wants to find the complex permeability of a magnetic material. Several authors have developed techniques to fill this shortfall: two thickness method, frequency varying method, and sample added method; however, these techniques are not always applicable [Baker-Jarvis et al, 1994;Chen et al, 2005;Maode et al, 1999;Stewart and Havrilla, 2006;Tantot et al, 1997;Wang et al, 1998]. A more suitable alternative would be a waveguide probe system which allows the simultaneous collection of reflection and transmission coefficients since such measurements are independent over all wavelengths (thereby avoiding the necessity of using an underdetermined reflection-only optimization algorithm) and are thus the most efficient means of determining both permittivity and permeability.…”

Section: Introductionmentioning

confidence: 99%

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Nondestructive electromagnetic material characterization using a dual waveguide probe: A full wave solution

et al. 2009

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[1] A nondestructive technique for determining the complex permittivity and permeability of a perfect electric conductor backed magnetic shielding material using a dual waveguide probe is presented. The dual waveguide probe allows for the simultaneous collection of reflection and transmission coefficients which distinguishes it from single probe methods common in the literature. Theoretical development of these coefficients, which is accomplished through a coupled magnetic field integral equations formulation using Love's equivalence principle and solved via the method of moments (MOM), is discussed. Evaluation of the resulting MOM impedance matrix elements is performed using complex plane integration leading to enhanced computational efficiency and physical insight. Comparison of the theoretical and measured reflection and transmission coefficients using a root finding algorithm leads to the desired permittivity and permeability. Measurement results of a magnetic shielding material are presented and compared to traditional methods for the purpose of validating the new technique. The probe's sensitivity to aperture alignment, sample thickness, and flange thickness is also investigated.

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Section: àJkrsupporting

confidence: 61%

Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Nondestructive electromagnetic material characterization using a dual waveguide probe: A full wave solution

et al. 2009

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“…The restrictions for diminishing of sample preparation, the openness property of the probe structure and ability of handling of high power are the main reasons. Moreover, the reflection property of the probe (Γ) is sensitive to more than one variable, which allows to measure different parameters of test material such as electromagnetic parameters (ε r , µ r ) and its thickness as well [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…These techniques can be performed via changing thickness of the test material (d), or changing the measurement frequency (f), or changing part of the tested material. They are respectively called Thickness-Varying Method (TVM) [11], Frequency-Varying Method (FVM) [12] and Sample-Varying Method (SVM) [11]. Both TVM method and FVM method are performed using single-layer (test material only) while SVM method is performed using two layers of known material followed by test material.…”

Section: Introductionmentioning

confidence: 99%

Multilayer Structure Technique for Improving Determination of Electromagnetic Properties of Radar Absorbers Based on Two-Layer Method and Flanged Rectangular Waveguide Probe

Hassan

Saadie

2020

IJEEI

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This paper presents further development of utilization of a two-layer method to perform nondestructive electromagnetic properties determination of planar radar absorbers using flanged open-ended rectangular waveguide probe. A multilayer structure of three layers was proposed to improve the measured results of these parameters obtained using two-layer method. These layers were arranged such that the test material is sandwiched between two known low loss materials to provide the two needed independent reflection coefficients necessary to extract them at different conditions of testing. The proposed structure was aimed to decrease the effect of direct backing of test material by metal plate, which influences measurement accuracy if two-layer method is used. The structure permits a suitable electric field interrogation in test material and decreases the influences of both radial and surface waves. FDTD method was adapted for modeling the problem geometry to calculate the reflection coefficients since a probe with finite flange size is used. Measurements were carried out using the proposed technique to determine complex permittivity and complex permeability of several radar absorbers over X-band applications of microwaves. In comparison with both single-layer and two-layer methods results, the measured results of these parameters agreed well with the published data by companies and literatures.

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EM-properties measurement of concave-surface coating materials using a modified open-ended coaxial probe

Hassan

Maode

et al. 2000

Microw. Opt. Technol. Lett.

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In this work, a new aspect of the utilization and development of the open‐ended coaxial probe technique for EM‐properties measurement of coating materials with a concave surface is studied. It is found from the results of an analysis performed using FDTD modeling that the reflection coefficient is strongly affected, even for large sample radii. In order to satisfy concave‐surface materials measurement, we propose a technique to modify the standard open‐ended coaxial probe to improve measurement accuracy. It is based on adding a ring patch at the end of the extended length of the inner conductor throughout the air gap between the probe and the material under test. The proposed technique is analyzed and verified by experiments. Results of the measured ε* and μ* of the several microwave‐absorbing materials coated on prototype boxes with different radii for shielding are in relative agreement with the published data. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 278–281, 2000.

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A frequency-varying method for simultaneous measurement of complex permittivity and permeability with an open-ended coaxial probe

Cited by 50 publications

References 11 publications

Nondestructive electromagnetic material characterization using a dual waveguide probe: A full wave solution

Nondestructive electromagnetic material characterization using a dual waveguide probe: A full wave solution

Multilayer Structure Technique for Improving Determination of Electromagnetic Properties of Radar Absorbers Based on Two-Layer Method and Flanged Rectangular Waveguide Probe

EM-properties measurement of concave-surface coating materials using a modified open-ended coaxial probe

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