Design of Cylindrical Dielectric Resonators in Inhomogeneous Media

Bonetti, R.R.; Atia, A.E.

doi:10.1109/tmtt.1981.1130351

Cited by 30 publications

(5 citation statements)

References 8 publications

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“…The structure is analyzed using the proposed technique and the resonant frequencies are evaluated. Table III gives the accuracy comparison of the proposed technique with the conventional FEMFD approach, and with the results reported in [17]. The results match accurately.…”

Section: Computational Resultsmentioning

confidence: 65%

“…Example 2: This example consists of an inhomogeneous dielectric resonator shown in Figure 3. It is chosen [17] for the purpose of demonstrating the accuracy and computational efficiency of the proposed model-reduction technique. The configuration consists of a cylindrical high-dielectric constant material (region 3) positioned between three layers of different dielectrics.…”

Section: Computational Resultsmentioning

confidence: 99%

“…The transfer function of the system is then found by matching a Pade approximation to the moments of the system in (17). The reduced-order model which is obtained in terms of approximate dominant poles p i and residues k i of the system can be represented as…”

Section: A Finite Element Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Reduced‐order method for dielectric resonators using FEM and CFH

Kolbehdari

Nakhla

1999

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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This paper describes an efficient reduced-order method for the analysis of cylindrical dielectric resonators with an inhomogeneous dielectric medium. The field equations are formulated using the Laplace-domain finite element method and are reduced to lower-order models using the complex frequency hopping (CFH) technique. CFH is a moment matching technique which has been used successfully in the circuit simulation area for the solution of a large set of ordinary differential equations. The proposed technique is faster than the conventional approach by one to three orders of magnitude. The results are compared with those of other numerical methods available in the literature.

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Section: Computational Resultsmentioning

confidence: 65%

Section: Computational Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Reduced‐order method for dielectric resonators using FEM and CFH

Kolbehdari

Nakhla

1999

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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show abstract

“…It is a typical structure for microwave integrated circuit (MIC) application, where the DR is mounted on a dielectric substrate, and the resonant frequency can be either an increasing or a decreasing function of the tuning disk position (d). The resonant frequency calculation for the TEol8 mode as a function of the distance d comes from the equations based on boundary conditions in the interfaces DR-substrate and DR-air layer [13][14]. The resonant frequency variation with temperature is commonly represented by the temperature coefficient (re).…”

Section: Methodsmentioning

confidence: 99%

Barium nanotitanate microwave ceramics obtained by a chemical method

Castro

Zanetti

2013

2013 SBMO/IEEE MTT-S International Microwave &Amp; Optoelectronics Conference (IMOC)

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Dielectric resonators with high dielectric constant, low dielectric losses and high frequency stability have been widely used in microwave circuits for telecommunications as filters, oscillators, antennas. Among the compounds of the BaO Ti02 system, Ba2 Ti9020 has met these requirements. However, such materials are difficult to obtain by conventional mechanical powder mixture due to the preferential formation of secondary phases and high sintering temperatures around 1300°C. In this investigation a new approach for obtaining B20radded Ba2 Ti9020 is considered through a chemical method involving a co-precipitation process aiming to reduce the sintering temperature and to promote a high microstructural homogeneity of the compound. Therefore, cylindrical ceramics were sintered at 1000-1150°C presenting values of electric permittivity from 34.8 to 41.4, quality factor due to dielectric losses from 2945 to 3525, temperature coefficient from 6.2 to 10.2 ppm/DC and an overall tunable frequency range of 5.00-7.00 GHz, which yields promising properties for use as dielectric resonators.

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“…Putting the dielectric resonator inside a closed metal cavity can completely eliminate the effect of field radiation. Several different theoretical and experimental analyses have been reported in the literatures [16][17][18][19]. Accurate prediction of resonant frequency was given in their papers; however the field expressions are usually quite complicated and imperfect.…”

Section: Introductionmentioning

confidence: 99%

A Modified Formula for Microwave Measurement of Dielectric Loss Using a Closed Cylindrical Cavity Dielectric Resonator

Cao¹,

Cao²

2014

PIER Letters

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Abstract-This paper provides a modified formula for calculating dielectric loss of dielectric resonator of working in TE 01δ mode in closed cavity. The measurement system is divided into six regions. Based on analyzing the formula of loss tangent published in literatures, a quality factor of a substrate is created, and a modified formula is proposed. Validating the modified formula, with three substrates as supports, the frequencies and unloaded quality factors of dielectric resonators made of two sorts of dielectric materials with permittivity 38 and 75 respectively are measured using a closed cavity method. The measured results are compared with those obtained by other well-known formulas and show a good agreement with the result given by the parallel plate method.

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Design of Cylindrical Dielectric Resonators in Inhomogeneous Media

Cited by 30 publications

References 8 publications

Reduced‐order method for dielectric resonators using FEM and CFH

Reduced‐order method for dielectric resonators using FEM and CFH

Barium nanotitanate microwave ceramics obtained by a chemical method

A Modified Formula for Microwave Measurement of Dielectric Loss Using a Closed Cylindrical Cavity Dielectric Resonator

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