Dielectric characterisation of small samples using broadband coaxial cavity

Yu, Chengyong; Li, En; Guo, Gaofeng

doi:10.1049/el.2017.2492

Cited by 14 publications

(5 citation statements)

References 6 publications

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“…In this paper, the dielectric properties of four typical materials are investigated, whose permeabilities are assumed to be µ r = 1. Therefore, the dielectric properties of materials can be acquired by the following cavity perturbation equations [26]- [30]:…”

Section: B Cavity Perturbation Methodsmentioning

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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Section: B Cavity Perturbation Methodsmentioning

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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“…And the surface current distribution of the TEM 00q mode on the plane mirror is distributed along the diameter direction, while the surface current distribution of the non-TEM 00q is not satisfied. Considering that the slits on the resonator can cut off the surface current distribution [3,4], the current path of some parasitic modes can be cut off by slitting along the diameter direction in the plane mirror, to achieve the purpose of suppressing the parasitic mode, as shown in Figure 3. And the comparison of the suppression effect is shown in Figure 4 around 113.7GHz.…”

Section: Design Of the Systemmentioning

confidence: 99%

A quasi‐optical resonator with new coupling method and parasitic‐mode‐suppressing in 110–170 GHz

Long

Zhang

Cheng

et al. 2023

Electronics Letters

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In this paper, a quasi-optical resonator with new coupling method and parasitic-mode-suppressing in 110-170 GHz is proposed. The coupling of terahertz (THz) quasi-optical resonator in this paper is realized by PCB substrate processing and pressurized flange. At the same time, the parasitic mode is effectively suppressed by slitting the plane mirror to reduce the influence on the main mode during the test. And the fused quartz sample was tested to verify the feasibility of the system for complex dielectric testing of materials in 110-170 GHz.

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“…Considering this situation, the concentric ring gaps made in the shorting plate, shown in Figure , is a simple way to solve the problem, inspired by Ref. . In this way, the current paths of the unwanted modes were cut off while keeping the dominant mode almost unaffected.…”

Section: Analysis and Simulationmentioning

confidence: 99%

A modified dielectric rod resonator with a purer mode distribution based on multi‐gap on the substrate

Long

Guo

2019

Micro & Optical Tech Letters

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In this article, a modified dielectric rod resonator with a purer mode distribution has been proposed for the measurement of the dielectric properties of dielectric materials. The resonator is short circuited at both flat ends by two hard copper‐clad dielectric substrates, which replace the commonly used metal conducting plates. Concentric ring gaps are etched out on one side the dielectric substrates as shorting plates to reduce the degenerate TM0np modes while not affecting the dominant TE0np modes as much as possible. Experimental results show that the modified dielectric rod resonator has a better mode distribution in the high frequency band than the conventional resonator, which is very useful for the accurate and broadband measurement of dielectric materials.

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Dielectric characterisation of small samples using broadband coaxial cavity

Cited by 14 publications

References 6 publications

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

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

A quasi‐optical resonator with new coupling method and parasitic‐mode‐suppressing in 110–170 GHz

A modified dielectric rod resonator with a purer mode distribution based on multi‐gap on the substrate

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