RF Characterization of Magnetodielectric Material Using Cavity Perturbation Technique

Han, Kyu Seok; Swaminathan, Madhavan; Pulugurtha, Raj; Sharma, Himani; Tummala, Rao; Rawlings, Brandon; Nair, V.

doi:10.1109/tcpmt.2015.2465383

Cited by 24 publications

(13 citation statements)

References 21 publications

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“…The characteristic impedance (Z TE n0 II ) and the propagation constant (γ TE n0 z,II ) in the anisotropic material are given in Equations (22) and (23).…”

Section: Forward Problem: Reflection Coefficient Of a Pec Backed Anmentioning

confidence: 99%

“…Another difficulty related with these methods is adequate sample preparation which needs precise machining. 23 On the other hand, non-resonant methods have wider frequency range but at the expense of less accuracy and the sample preparation process is usually less sensitive. Non-resonant measurements are performed either in free space 24 or in a waveguide system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A reflection‐only method for characterizing PEC‐backed anisotropic materials using waveguide higher order modes

Nazeri

Baharian

Abdolali

et al. 2020

Int J RF Microw Comput Aided Eng

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This paper presents a new reflection‐only set‐up for characterizing the properties of an anisotropic PEC‐backed materials. Albeit, the reflection‐only methods are established long ago, they are not elaborated appropriately for retrieving industrial anisotropic materials. In spite of other researches, this method is capable to determine tensors of both permittivity and permeability of an anisotropic PEC‐backed material. In contrast to similar researches, this method is mathematically simple and easy to implement. Tensors of epsilon and mu of PEC‐backed sample are characterized by rotating sample and measuring reflection coefficient in various configuration. Not measuring the transmission, in order to provide enough equations, the higher order mode of the waveguide is employed. A three‐port probe is designed for this goal and optimized to excite the TE10 and TE20 modes simultaneously. Good agreement of retrieved parameters from experimental measurements with those of actual ones shows the reliability of this set‐up for characterization of PEC‐backed anisotropic composites.

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“…The characteristic impedance (Z TE n0 II ) and the propagation constant (γ TE n0 z,II ) in the anisotropic material are given in Equations (22) and (23).…”

Section: Forward Problem: Reflection Coefficient Of a Pec Backed Anmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A reflection‐only method for characterizing PEC‐backed anisotropic materials using waveguide higher order modes

Nazeri

Baharian

Abdolali

et al. 2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…Therefore, SIW cavity sensors primarily require the additional standard reference materials to estimate the shape factor at dominant/ lower order mode of the cavity [16,17]. Moreover, the conventional material perturbation approach using the conventionally feed SIW cavity necessitates the design of many sets of dedicated cavities to characterize the sample over more than one frequency point [20]. The problem becomes more severe when the test specimen is a magnetic composite as it requires the design of dedicated cavities for magnetic and dielectric testing [20].…”

Section: Introductionmentioning

confidence: 99%

Novel substrate integrated waveguide cavity-based unified multiband permittivity and permeability estimation approach

Tiwari

Singh

Akhtar

2020

Journal of Electromagnetic Waves and Applications

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A novel approach of multiband real permittivity and permeability estimation of the magnetic composites using a modified under coupled multimodal (TE10p) substrate integrated waveguide (SIW) cavity is presented. The proposed schemes allow the accurate wideband microwave characterization of the magneto-dielectric composites by using the higher-order modes of the designed SIW cavity. The analytical closed-form modified formulation is developed to calculate the permittivity and permeability over the wide frequency range, 10-20 GHz. Consequently, a unified empirical formulation is also developed, which can be used to generate the approximate prior values of multimodal permittivity and permeability for the synthesized magnetic composites, which is usually not known in advance. The proposed analytical and empirical approaches are validated numerically and experimentally, corresponding to various test samples. The estimated parameters using the proposed analytical approach are found to be in quite close agreement, error < 5%, with the corresponding reference values and empirically generated values.

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“…As for the resonance method, the samples are usually placed at the strongest electric field in the resonant system. Based on the changes of the parameters of the resonance system before and after putting the samples into the resonance system and the perturbation theory formula, the dielectric properties of the samples can be acquired [5]- [7]. Commonly, the former method is suitable…”

Section: Introductionmentioning

confidence: 99%

Evolution and Analysis of Dielectric Properties of Typical Materials Under Strong Microwave Field

Gao

Guo

et al. 2019

IEEE Access

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The complex dielectric constant is the intrinsic parameter of microwave material, and the accurate acquisition of its value is critical for its application. Generally, the dielectric properties of microwave materials are obtained under weak electromagnetic field. However, with the continuous development of high power microwave technology, the microwave field intensity around materials gradually increases, and the test results of the dielectric properties of materials under the weak electromagnetic field will not be able to characterize the test results under the high power environment. Therefore, a novel testing technology based on the resonator method is proposed, which provides an effective solution for the measurement and characterization of microwave dielectric properties of materials under strong microwave field. Based on the constructed system, the evolution rules of the microwave characteristics of four typical materials are obtained. In the experiment, the temperature of the samples is precisely monitored, and the evolution rules of the temperature characteristics of the dielectric properties of the samples under strong and weak microwave fields are compared. The comparison results demonstrate that the dielectric properties of materials under strong fields are related not only to the microwave heating effect but also to the mechanism of the nonthermal microwave effect.INDEX TERMS Dielectric property, measurement, microwave field, non-thermal microwave effect.

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RF Characterization of Magnetodielectric Material Using Cavity Perturbation Technique

Cited by 24 publications

References 21 publications

A reflection‐only method for characterizing PEC‐backed anisotropic materials using waveguide higher order modes

A reflection‐only method for characterizing PEC‐backed anisotropic materials using waveguide higher order modes

Novel substrate integrated waveguide cavity-based unified multiband permittivity and permeability estimation approach

Evolution and Analysis of Dielectric Properties of Typical Materials Under Strong Microwave Field

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