Enhanced Full-Wave Circuit Analysis for Modeling of a Split Cylinder Resonator

Marques-Villarroya, David; Peñaranda‐Foix, Felipe L.; García-Baños, Beatriz; Catalá-Civera, J.M.; Gutiérrez-Cano, José D.

doi:10.1109/tmtt.2016.2637932

Cited by 13 publications

(13 citation statements)

References 27 publications

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“…The results are compared with a numerical method developed in [16], which consist of a full-wave circuit technique for the analysis of circular cavities. The relative differences between both methods are negligible (less than 0.5% in all the cases).…”

Section: Numerical Resultsmentioning

confidence: 99%

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Fast and Accurate Determination of the Complex Resonant Frequency of a Multilayer Circular Cavity Using Chebyshev's Root-Finder

Marques-Villarroya¹,

Peñaranda‐Foix²,

García-Baños³

et al. 2017

PIER M

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Abstract-In this paper, a general multilayer circular cavity with N slabs is analyzed analytically, obtaining characteristic equations for TE and TM modes to compute the complex resonant frequency efficiently using an algorithm based on Chebyshev's root finder. The accuracy of the solutions is compared with full-wave circuit method, and the computational speed to achieve the roots of the characteristic equations is also compared with Cauchy Integral Method, which is commonly used to obtain complex roots. Furthermore, the relationship between the amplitudes of the different regions is obtained, whereby the whole structure can be analyzed as a single one from now on.

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Section: Numerical Resultsmentioning

confidence: 99%

“…Note that for full-wave circuit method, is not possible the application of Chebyshev's root finder, since it solves an eigenvalue problem [16], which has implicit the absolute value function (| det(X)| = 0) that produces multiple discontinuities.…”

Section: Numerical Resultsmentioning

confidence: 99%

Fast and Accurate Determination of the Complex Resonant Frequency of a Multilayer Circular Cavity Using Chebyshev's Root-Finder

Marques-Villarroya¹,

Peñaranda‐Foix²,

García-Baños³

et al. 2017

PIER M

Self Cite

View full text Add to dashboard Cite

show abstract

“…The glasses are characterized following the classical methods, therefore for each cell, the properties of the glasses are known. Thus, the modal analysis method described [15][16][17] is used, where the structure is divided in canonical circuital elements and the only unknown is the dielectric properties of the LC material. The chosen working mode of the resonator is based on the field distribution.…”

Section: Methods Descriptionmentioning

confidence: 99%

Measurement of the Dielectric Properties of Liquid Crystal Material for Microwave Applications

Sánchez

Nova

Martín

et al. 2019

Proceedings 17th International Conference on Microwave and High Frequency Heating

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Liquid Crystal (LC) is an anisotropic liquid material which flows like a liquid, but at the same time its molecules have an orientational order like in the solid state [1]. Thus, LC is a promising dielectric material for designing reconfigurable devices at microwave frequencies. In order to optimize the design of reconfigurable microwave devices, accurate values of the dielectric permittivity and the loss tangent of LCs are needed. However, new LCs are not well characterized at these frequencies because of its recent use for microwave applications. Therefore, the characterization in this frequency range is required for its practical use within microwave components and devices [2]. In this work, the split-cylinder resonator method has been used for the characterization of LCs at two frequency points, i.e. 5 and 11 GHz. The method is based on the measurement of the resonance frequency and quality factor of the two states of the LC molecules for extracting the complex dielectric permittivity [3]. For achieving these two states, no electric or magnetic fields are needed, just the cell must be turned 90º inside the cavity. The dielectric properties (permittivity and loss tangent) of four different LC samples, GT3-23002 from Merck and QYPD193, QYPD142, and QYPD036 from Qingdao QY Liquid Crystal Co, have been obtained. The highest values of the dielectric anisotropy are presented for the samples QYPD036 and QYPD193, together with the highest values of the corresponding loss tangent parameters. Furthermore, it is observed for all the LCs that the loss tangent decreases and the dielectric anisotropy increases at higher frequencies, which must be taken into account in the development of reconfigurable microwave devices.

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“…Split-cylinder resonator: consists of a cylindrical cavity split into two sections. Laminar MUTs can be placed between the two sections to perform non-destructive materials characterization [7,35–37]. Microstrip resonator: a resonator is fabricated on a substrate and the MUT is placed on top of the resonator to ‘load’ it.…”

Section: Materials Characterizationmentioning

confidence: 99%

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Brinker

Dvorsky

Ghasr

et al. 2020

Phil. Trans. R. Soc. A.

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Microwave and millimetre-wave non-destructive testing and evaluation (NDT&E) has a long history dating back to the late 1950s (Bahr 1982 Microwave non-destructive testing methods ; Zoughi 2000 Microwave Non-destructive testing and evaluation principles ; Feinstein 1967 Surface crack detection by microwave methods ; Ash 1973 In 3rd European Microwave Conference ; Auld 1981 Phys. Technol. 12 , 149–154; Case 2017 Mater. Eval. 75 ). However, sustained activities in this field date back to the early 1980s (Zoughi 1995 Res. Nondestr. Eval. 7 , 71–74; Zoughi 2018 Mater. Eval. 76 , 1051–1057; Kharkovsky 2007 IEEE Instrumentation & Measurement Magazine 10 , 26–38). Owing to various limitations associated with using microwaves and millimetre waves for NDT&E, these techniques did not see much utility in the early days. However, with the advent and prevalence of composite materials and structures, in a wide range of applications, and technological advances in high-frequency component design and availability, these techniques are no longer considered as ‘emerging techniques’ (Zoughi 2018 Mater. Eval. 76 , 1051–1057; Schull 2002 Nondestructive evaluation: theory, techniques, and applications ). Currently, microwave and millimetre-wave NDT&E is a rapidly growing field and has been more widely acknowledged and accepted by practitioners over the last 25+ years (Case 2017 Mater. Eval. 75 ; Bakhtiari 1994 IEEE Trans. Microwave Theory Tech . 42 , 389–395; Bakhtiari 1993 Mater. Eval. 51 , 740–743; Bakhtiari 1993 IEEE Trans. Instrum. Meas. 42 , 19–24; Ganchev 1995 IEEE Trans. Instrum. Meas. 44 , 326–328; Bois 1999 IEEE Trans. Instrum. Meas. 48 , 1131–1140; Ghasr 2009 IEEE Trans. Instrum. Meas. 58 , 1505–1513). Microwave non-destructive testing was recently recognized and designated by the American Society for Nondestructive Testing (ASNT) as a ‘Method’ on its own (Case 2017 Mater. Eval. 75 ). These techniques are well suited for materials characterization; layered composite inspection for thickness, disbond, delamination and corrosion under coatings; surface-breaking crack detection and evaluation; and cure-state monitoring in concrete and resin-rich composites, to name a few. This work reviews recent advances in four major areas of microwave and millimetre-wave NDT&E, namely materials characterization, surface crack detection, imaging and sensors. The techniques, principles and some of the applications in each of these areas are discussed. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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Enhanced Full-Wave Circuit Analysis for Modeling of a Split Cylinder Resonator

Cited by 13 publications

References 27 publications

Fast and Accurate Determination of the Complex Resonant Frequency of a Multilayer Circular Cavity Using Chebyshev's Root-Finder

Fast and Accurate Determination of the Complex Resonant Frequency of a Multilayer Circular Cavity Using Chebyshev's Root-Finder

Measurement of the Dielectric Properties of Liquid Crystal Material for Microwave Applications

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

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