Proceedings ArticleDOI
Empirical evaluation of loss mechanisms in high frequency helix circuits
J.R. Legarra,A. Jacquez +1 more
- pp 481-484
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TLDR
In this paper, the intrinsic rf losses in each of a series of experimental helix circuits were measured to evaluate loss mechanisms in the helix tape and dielectric support rods, and the effects of helix material, helix surface finish, and rod material were measured over the frequency range of 10 GHz to 20 GHz in a test vehicle similar in design to circuits used in I-J band TWTs.Abstract:
The intrinsic rf losses in each of a series of experimental helix circuits were measured to evaluate loss mechanisms in the helix tape and dielectric support rods. The effects of helix material, helix surface finish, and rod material were measured over the frequency range of 10 GHz to 20 GHz in a test vehicle similar in design to circuits used in I-J band TWTs. The nonresonant perturbation measurement technique permitted separation of conductor losses from dielectric losses while avoiding errors common to other measurement methods. A by-product of the measurement technique was the circuit wavelength used to normalize the loss data.read more
Citations
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Journal ArticleDOI
A Simple and Accurate Analysis of Conductivity Loss in Millimeter-Wave Helical Slow-Wave Structures
TL;DR: In this article, a closed form expression was derived for the inductance per unit length of the transmission-line equivalent circuit of the structure, taking into account the actual helix tape dimensions and surface current on the helix over the actual metallic area of the tape.
Proceedings ArticleDOI
Estimation of conductivity losses in a helix slow-wave structure using eigen-mode solutions
P. S. Rao,Subrata Kumar Datta +1 more
TL;DR: In this article, a simple method of estimating the attenuation constant due to conductivity losses and surface finish in a helix slow-wave structure, using the quality factor and dispersion characteristics obtainable from the eigenmode solutions through 3D HFSS modeling, is presented.
Journal ArticleDOI
Three-Dimensional Electromagnetic Analysis of Attenuator-Coated Helix Support Rods of a Traveling-Wave Tube
V.B. Naidu,Subrata Kumar Datta,Pravin Rao,Amit Agrawal,Simhadri Uma Maheswara Reddy,Lalit Kumar,Biswajit Basu +6 more
TL;DR: In this article, the attenuation constants of a helical slow-wave structure with three helix support rods inside a metal envelope were modeled by considering them to be made up of lossy dielectric material having equivalent bulk conductivity varied along the length following the loss of the coating.
Journal ArticleDOI
A Simple Equivalent Circuit Analysis of the Dielectric Loss in a Helical Slow-Wave Structure of a Traveling-Wave Tube
TL;DR: In this paper, the electromagnetic field analysis of a helical slow-wave structure was carried out based on a tape-helix model incorporating the effects of space-harmonic propagating modes and the surface current on the helix over the actual metallic area of the tape.
Journal ArticleDOI
Analysis of Dielectric Loss in a Helix Slow-wave Structure
TL;DR: In this article, equivalent circuit analysis of a helix slow-wave structure was carried out and closed form expressions were derived for the shunt capacitance and shunt conductance per unit length of the transmission-line equivalent circuit of the structure.
References
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Journal ArticleDOI
Theoretical and experimental TWT helix loss determination
TL;DR: In this paper, the effect on loss of the dielectric support rods for the helix is taken into account and an accurate theoretical analysis of the loss of a helix structure is presented.
Proceedings ArticleDOI
Measurement of microwave characteristics of helix traveling wave circuits
TL;DR: In this article, an Automatic Network Analyzer is used to control a perturbation measurement sequence which generates amplitude and phase information on the microwave signals in the circuits in order to accurately and rapidly measure phase velocity, loss profile, and Pierce impedance in helix traveling wave circuits.