Fundamental interaction impedance of a helix surrounded by a dielectric and a metal shield

McMurtry, B. J.

doi:10.1109/t-ed.1962.14972

Cited by 25 publications

(9 citation statements)

References 1 publication

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“…In order to add a more practical relevance to the above expression forK, one should replace £,(0) in (9) or (10) by the electric field amplitude averaged over the electron beam cross-section ( 4).…”

Section: Inhomogeneous Loadingmentioning

confidence: 99%

Analytical Approaches to the Study of Helical Slow-Wave Structures for Broadband TWTs

Jain¹,

Basu²,

Sinha³

1993

IETE Technical Review

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Section: Inhomogeneous Loadingmentioning

confidence: 99%

Analytical Approaches to the Study of Helical Slow-Wave Structures for Broadband TWTs

Jain¹,

Basu²,

Sinha³

1993

IETE Technical Review

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“…4 Without Dielectric Gap/Pitch = 42 .77 viii EVALUATION A significant cost associated with the design and development of helical traveling wave tubes has been incurred by "cut and try" techniques. Various analytic methods have been developed to attempt to adequately model a slow wave structurehowever, these at best have been first order approximations.…”

Section: List Of Illustrations (Cont'd)mentioning

confidence: 99%

Variational Analysis of Helical Slow Wave Structures.

Fontana¹,

MacGregor²

1980

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UNCLASSIFIEDIn order to verify the technique, two trial field regions have been used in successfully analyzing the sheath helix and the case of a homogeneous dielectric support. A composite metal-ceramic helix has also been analyzed. Simulation for the composite helix shows a reasonable dispersion for some combinations of harmonics over a wide frequency range when results are compared to experiment. However, the impedance computation is not yet satisfactory.In future developments, major modifications will be made to the trial fields in order to satisfy all boundary conditions simultaneously and improve the predicted impedance. In addition, the technique will be applied to other devices including wedge and rod supports.

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“…Tien [10] and McMurtry [11] have analysed the effects of a supporting dielectric layer surrounded by a metal tube based on a tape-current distribution used by Sensiper [4] and Watkins [6]. The same observation may be made about the work of Uhm [12] on guided electromagnetic wave propagation using the anisotropically conducting model of a dielectric-loaded tape helix.…”

Section: Introductionmentioning

confidence: 98%

“…Almost all of the existing literature on the propagation of electromagnetic waves guided by a dielectric-loaded tape helix are based either on an ad hoc assumption about the tape-current distribution [9][10][11][12][13][14][15] or an a'priori assumption about the behavior of the tape-current distribution near the tape edges [17]. Tien [10] and McMurtry [11] have analysed the effects of a supporting dielectric layer surrounded by a metal tube based on a tape-current distribution used by Sensiper [4] and Watkins [6].…”

Section: Introductionmentioning

confidence: 99%

Propagation of Electromagnetic Waves Guided by the Anisotropically Conducting Model of a Tape Helix Supported by Dielectric Rods

Kalyanasundaram¹,

Babu²

2013

PIER B

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Abstract-The practically important case of a dielectric-loaded tape helix enclosed in a coaxial perfectly conducting cylindrical shell is analysed in this paper. The dielectric-loaded tape helix for guided electromagnetic wave propagation considered here has infinitesimal tape thickness and infinite tape-material conductivity. The homogeneous boundary value problem is solved taking into account the exact boundary conditions similar to the case of anisotropically conducting open tape helix model [1,2]. The boundary value problem is solved to yield the dispersion equation which takes the form of the solvability condition for an infinite system of linear homogeneous algebraic equations viz., the determinant of the infiniteorder coefficient matrix is zero. For the numerical computation of the approximate dispersion characteristic, all the entries of the symmetrically truncated version of the coefficient matrix are estimated by summing an adequate number of the rapidly converging series for them. The tape-current distribution is estimated from the null-space vector of the truncated coefficient matrix corresponding to a specified root of the dispersion equation.

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Fundamental interaction impedance of a helix surrounded by a dielectric and a metal shield

Cited by 25 publications

References 1 publication

Analytical Approaches to the Study of Helical Slow-Wave Structures for Broadband TWTs

Analytical Approaches to the Study of Helical Slow-Wave Structures for Broadband TWTs

Variational Analysis of Helical Slow Wave Structures.

Propagation of Electromagnetic Waves Guided by the Anisotropically Conducting Model of a Tape Helix Supported by Dielectric Rods

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