Practical expression for frequency deviation due to insertion hole in cylindrical cavity

Peñaranda‐Foix, Felipe L.; Catalá-Civera, J.M.; Canos-Marin, A.J.; García-Baños, Beatriz

doi:10.1049/el:20072226

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Under these assumptions and by taking into account (10) for a thin and very low-loss sample holder, the relative frequency and -factor shifts to be used in (3) and (4) are expressed, respectively, as (11) (12) where and are the resonance frequency and -factor of the cavity, respectively, with the empty sample holder and and with the sample holder containing the specimen. The insertion hole in the cylindrical cavity shifts the resonant frequency and lowers the -factor depending on the EM fields, geometry, and material properties (near or through the hole) [30]. In the microwave cavity shown in Fig.…”

Section: A Cpmmentioning

confidence: 99%

Dynamic Measurement of Dielectric Properties of Materials at High Temperature During Microwave Heating in a Dual Mode Cylindrical Cavity

Catalá-Civera

Canós

Plaza-Gonzalez

et al. 2015

IEEE Trans. Microwave Theory Techn.

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Abstract-A microwave cavity and heating system for microwave processing and in situ dynamic measurements of the complex permittivity of dielectric materials at high temperatures ( 1000 C) has been developed. The method is based on a dual-mode cylindrical cavity where heating and testing are performed by two different swept frequency microwave sources. A cross-coupling filter isolates the signals coming from both sources. By adjusting the frequency bandwidth of the heating source and the level of coupling to the cavity, an automatic procedure allows for the establishment of a desirable level of heating rate to the dielectric sample to reach high temperatures in short cycles. Dielectric properties of materials as a function of temperature are calculated by an improved cavity perturbation method during heating. Accuracy of complex permittivity results has been evaluated and an error lower than 5% with respect to a rigorous analysis of the cavity has been achieved. The functionality of the microwave dielectric measurement system has been demonstrated by heating and measuring glass and ceramic samples up to 1000 C. The correlation of the complex permittivity with the heating rate, temperature, absorbed power, and other processing parameters can help to better understand the interactions that take place during microwave heating of materials at high temperatures compared to conventional heating.

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Section: A Cpmmentioning

confidence: 99%

Dynamic Measurement of Dielectric Properties of Materials at High Temperature During Microwave Heating in a Dual Mode Cylindrical Cavity

Catalá-Civera

Canós

Plaza-Gonzalez

et al. 2015

IEEE Trans. Microwave Theory Techn.

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“…It appears at large permittivities and at large aspect rates. Then in 2007 Penaranda-Foix (Penaranda-Foix et al, 2007c) proposed an alternative exponential equation obtained from the exact value and (71):…”

Section: Parametersmentioning

confidence: 99%

Circuital Analysis of Cylindrical Structures Applied to the Electromagnetic Resolution of Resonant Cavities

Peñaranda‐Foix¹,

Catalá-Civera²

2010

Passive Microwave Components and Antennas

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Measurement of dielectric properties at high-temperatures in real-time with cylindrical cavity

Canos-Marin

Peñaranda‐Foix

Catalá-Civera

et al. 2010

2010 IEEE MTT-S International Microwave Symposium

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Practical expression for frequency deviation due to insertion hole in cylindrical cavity

Cited by 4 publications

References 8 publications

Dynamic Measurement of Dielectric Properties of Materials at High Temperature During Microwave Heating in a Dual Mode Cylindrical Cavity

Dynamic Measurement of Dielectric Properties of Materials at High Temperature During Microwave Heating in a Dual Mode Cylindrical Cavity

Circuital Analysis of Cylindrical Structures Applied to the Electromagnetic Resolution of Resonant Cavities

Measurement of dielectric properties at high-temperatures in real-time with cylindrical cavity

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