Circular Corrugated Miter Bend and Gap Losses for Broadband Frequency Applications
| Autor: | A. Zolfaghari, E. J. Doyle, G. Wang, G. R. Hanson, W. A. Peebles, Cornwall Lau, M. C. Kaufman |
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| Rok vydání: | 2019 |
| Předmět: |
Radiation
Materials science business.industry Physics::Optics Bragg's law 020206 networking & telecommunications 02 engineering and technology Condensed Matter Physics law.invention Miter joint Electric power transmission Optics law Transmission line Broadband 0202 electrical engineering electronic engineering information engineering Direct coupling Electrical and Electronic Engineering Reflectometry business Waveguide |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 67:38-49 |
| ISSN: | 1557-9670 0018-9480 |
| Popis: | Circular corrugated waveguides are often used in fusion applications at single, multiple, or broadband millimeter frequencies due to their low ohmic loss, expected large frequency bandwidth, and direct coupling to free-space Gaussian modes. For single-frequency corrugated waveguide systems, transmission line components can be optimized to the desired frequency. For broadband or multiple-frequency applications, this is not possible. The goal of this paper is to demonstrate that the frequency bandwidth of circular corrugated waveguides can be compromised by diffraction losses to miter bends and gaps. It is shown that if the corrugation depth differs significantly from $\lambda $ /4, a theory can substantially underpredict the gap and miter bend losses. The simulations are also shown to compare favorably to experimental measurements. To improve the transmission line performance in large frequency bandwidth systems, such as 33–165 GHz reflectometry, reducing the number of miter bends may, therefore, be necessary. For the improvement of performance in narrower frequency bandwidth or multiple-frequency systems, especially high-powered systems, wavelength-dependent techniques may be applicable. One such application is shown for a Bragg reflection technique to reduce the thermal load to insulating ceramic rings in a dc break component for multiple-frequency ITER electron cyclotron heating transmission lines. |
| Databáze: | OpenAIRE |
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