Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

Peñaranda‐Foix, Felipe L.; Janezic, Michael D.; Catalá-Civera, J.M.; Canós, Antoni J.

doi:10.1109/tmtt.2012.2206048

Cited by 33 publications

(35 citation statements)

References 58 publications

(63 reference statements)

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“…To verify the accuracy of the dielectric calculations, a number of different samples in a wide range of dielectric constant and losses were machined in rods of 15-mm height and 9.8-mm diameter and measured inside quartz vials at room temperature by the CPM described above. The results were compared with measurements of the same samples, without the container, in a closed cylindrical cavity (diameter mm and height mm) solved by a rigorous mode-matching method [13]. The measured complex permittivities are tabulated in Table I.…”

Section: B Accuracy Of the Cpmmentioning

confidence: 99%

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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: B Accuracy Of the Cpmmentioning

confidence: 99%

“…The accuracy of dielectric measurements has been evaluated by comparing the results given by the CPM with a rigorous solution of the cylindrical cavity [13]. Experimental results of complex permittivity of ceramic and glass samples are given in Section V for temperatures varying from room temperature to 1000 C.…”

mentioning

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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“…The microwave dielectric values were measured, before sintering and once the samples were sintered, in a TM 0np cavity with the circuit analysis method as described in [25].…”

Section: Microwave Setupmentioning

confidence: 99%

High thermal stability of microwave sintered low-εr β-eucryptite materials

Benavente

Salvador

Peñaranda‐Foix

et al. 2015

Ceramics International

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Low-temperature sinterable microwave LiAlSiO 4 -based solid-state material was investigated with regard to microwave dielectric properties as functions of the sintering temperature. β-eucryptite materials and alumina-reinforced β-eucryptite composites were sintered by microwave technology at 1100 ºC and 1200 °C. The combination of fast heating and the dramatic reduction in cycle time, along with the non-conventional heating source, opens the way to produce materials with desired multifunctional properties. 2The microstructure and crystalline composition of the materials were characterised, and the mechanical, thermal and microwave dielectric behaviours were analyzed. X-ray diffraction showed good chemical stability in materials without between-phase reactions during the microwave sintering process. The excellent mechanical (~8 GPa of hardness and ~100 GPa of Young's modulus), thermal (-0.23·10 -6 K -1 ) and microwave dielectric properties (ε r = 4.10; Q = 1494) were obtained from the LAS/Al 2 O 3 composites sintered at a very low temperature (1100 ºC). The results achieved show the possibility of designing ceramic nanocomposites at low sintering temperatures using microwave technology with near-zero thermal expansion coefficients, high mechanical and chemical stability and low dielectric properties.

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“…network analyzer, a microwave amplifier, an infrared pyrometer and a computer were employed to carry out the measurement. The cylindrical rod shape sample was placed inside a quartz tube containers and microwave are applied for heating and measuring simultaneously inside a microwave cavity [10]. Typical uncertainty of these measurements is around 2% in real part and 5% in imaginary part.…”

Section: Characterizationmentioning

confidence: 99%

Microwave Preparation of SiO2-B2O3-Na2O-K2O-CaO-Fe2O3-TiO2 Glass System

Mandal¹,

Sinha²,

Sen³

et al. 2014

JCCE

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This study reports preparation of glass composition (54.50 wt.%) SiO 2 , (10.80 wt.%) B 2 O 3 , (14.20 wt.%) Na 2 O, (1.20 wt.%) K 2 O, (6.00 wt.%) CaO, (4.00 wt.%) Fe 2 O 3 and (9.30 wt.%) TiO 2 by melt quenching method using direct microwave heating and conventional resistive heating. Study of dielectric loss factor of the glass as function of temperature illustrated increasing loss factor above 370 o C, 550 o C, 650 o C and 900 o C, indicating enhanced microwave absorption by the glass at above these temperatures.Chemical analysis results of both the glasses depicted more volatilization loss of volatile ingredients in conventional heating. The study of chemical durability was performed from leachate analysis describing less leaching of Na 2 O, K 2 O and other constituents from glass melted in microwave furnace. Glass transition temperatures (T g ) were found to be 576.3 o C and 569.5 o C for glass melted in conventional and microwave heating route, respectively. Laboratory experiment of glass melting utilizing microwave energy as an alternate heating source demonstrated 70%-75% electrical power saving.

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Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

Cited by 33 publications

References 58 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

High thermal stability of microwave sintered low-εr β-eucryptite materials

Microwave Preparation of SiO2-B2O3-Na2O-K2O-CaO-Fe2O3-TiO2 Glass System

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