Analysis of an anisotropically loaded helix in the fast-wave regime for gyro-traveling-wave amplifiers
✍ Scribed by S. Ghosh; P. K. Jain; B. N. Basu
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 180 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
The dielectric-supported helix enclosed in an anisotropic metal en¨elope made of a metal cylindrical wa¨eguide pro¨ided with a large number of thin metal ¨anes projecting radially inward from its wall is field analyzed to study its characteristics in the fast-wa¨e regime. The tape-helix, instead of a simpler sheath-helix model, is used to consider the space-harmonic effects. Care is taken to account for the finite helix wirertape thickness by considering a free-space gap between the mean and the outer radii. The nonuniformity of the radial propagation constant o¨er the ¨arious cross-sectional regions of the structure is also taken into consideration in the analysis. The dispersion relation de¨eloped as a special case passes on to that obtained elsewhere for a ¨aneless, dielectric-absent structure as well as for a ¨aneless dielectric-present, structure. It is found that the parameters of the anisotropic en¨elope play a more dominant role in controlling the dispersion characteristics of the structure than the helix parameters. Furthermore, the effect of the controlling parameters is found to be less as the helix is brought closer to the wa¨eguide wall. The analysis presented can be used in the design of a helix-loaded cylindrical wa¨eguide interaction structure for a wideband fast-wa¨e, gyro-tra¨eling-wa¨e amplifier.