Approximate formulas for step discontinuities in circular waveguides

Sabatier, C.; Béhé, Roger; Brachat, P.

doi:10.1049/el:19900117

Cited by 4 publications

(7 citation statements)

References 1 publication

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“…The convergence of the results is obtained using 10 modes in waveguides and 6 modes for the association of the S matrices. Our results are in good agreement with the reference [10]. Once the analysis algorithm is validated, we apply a genetic algorithm-based optimization process for optimizing the studied structures.…”

Section: Numerical Results and Discussionsupporting

confidence: 80%

“…8 (corresponding to the two and foursection transformer respectively) show the variation of the voltage standing waves ratio VSWR as a function of frequency (curves in dashed line; before optimization by GA) for the dominant TE 11 mode in the useful band. The dimensions of the transformers are taken from reference [10]. Both transformers are quarter-wave, i.e., the length of sections are quarter-wave at design frequency f 0 = 9.5 GHz.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Among the employed techniques, the modematching method [7][8][9][10] is appropriate for mode step discontinuities.…”

Section: Introductionmentioning

confidence: 99%

“…The resulting algorithm is fast and accurate and has been used for modeling inhomogeneous quarter-wave transformers [11] and a good agreement is obtained with reference structures [10].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rigorous Design and Efficient Optimizattion of Quarter-Wave Transformers in Metallic Circular Waveguides Using the Mode-Matching Method and the Genetic Algorithm

Riabi¹,

Thabet²,

Belmeguenai³

2007

PIER

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Abstract-This paper presents an approach for the design and optimization of pseudo-gradual transitions in circular waveguides using the genetic algorithm (GA). The characterization of these transitions is carried out by the mode-matching method. This method, associated with the generalized scattering matrix technique, leads to determine the reflection coefficient on the useful band of the studied structures and to observe their frequential behavior. The GA is employed to optimize the choice of geometrical parameters by minimizing a cost function, corresponding to the maximum magnitude of the reflection coefficient in the band. The selection of the most relevant parameters allowed an improvement of the performances for the optimized components. Results of optimization are given for both two and four-section transformers.

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Section: Numerical Results and Discussionsupporting

confidence: 80%

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Among the employed techniques, the modematching method [7][8][9][10] is appropriate for mode step discontinuities.…”

Section: Introductionmentioning

confidence: 99%

“…The resulting algorithm is fast and accurate and has been used for modeling inhomogeneous quarter-wave transformers [11] and a good agreement is obtained with reference structures [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rigorous Design and Efficient Optimizattion of Quarter-Wave Transformers in Metallic Circular Waveguides Using the Mode-Matching Method and the Genetic Algorithm

Riabi¹,

Thabet²,

Belmeguenai³

2007

PIER

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show abstract

“…From (3), the first equation is projected on the basis g 12 p ; the second one on the basis f 1 mn , and the third one on the basis f 2 mn . The system (3) can be written with the matrixes formulation (12).…”

Section: Electric Equivalent Circuitmentioning

confidence: 99%

New and efficient modeling for telecommunication devices

Vuong¹,

Raveu²,

Baudrand³

et al. 2002

Int J RF and Microwave Comp Aid Eng

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Multiple waveguide discontinuity modelling with restricted mode interaction

Gesell

Ciric

1994

IEEE Trans. Microwave Theory Techn.

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A general modal analysis solution is presented for the scattering from multiple discontinuities in waveguides. As in a previous formulation, a recurrence procedure is used to derive the global scattering matrices from the coupled sets of truncated linear equations, which are obtained by expanding the corresponding fields in modal form and imposing the boundary conditions at each junction. In the present analysis, the higher order modes are included in the truncations at each discontinuity plane, but only those modes that effectively interact between the discontinuities are retained. Numerical results are given for a thick iris and multiple-step transformers in circular waveguides.

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Approximate formulas for step discontinuities in circular waveguides

Cited by 4 publications

References 1 publication

Rigorous Design and Efficient Optimizattion of Quarter-Wave Transformers in Metallic Circular Waveguides Using the Mode-Matching Method and the Genetic Algorithm

Rigorous Design and Efficient Optimizattion of Quarter-Wave Transformers in Metallic Circular Waveguides Using the Mode-Matching Method and the Genetic Algorithm

New and efficient modeling for telecommunication devices

Multiple waveguide discontinuity modelling with restricted mode interaction

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