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Optimization of micromachined relex klystrons for operation at terahertz frequencies

Garcia-Garcia, J., Martin, F. and Miles, R.E. (2004) Optimization of micromachined relex klystrons for operation at terahertz frequencies. IEEE Transactions on Microwave Theory and Techniques, 52 (10). pp. 2366-2370. ISSN 0018-9480

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New micromachining techniques now provide us with the technology to fabricate reflex klystron oscillators with dimensions suitable for operation in the terahertz region of the electromagnetic spectrum. For the success of these devices, accurate designs are required since the optimization of certain parameters is critical to obtaining useful amounts of ac power. Classical models for device design have long been in existence, but these are no longer valid at terahertz frequencies. For this reason, we have developed a simulation tool, specifically aimed at the design of terahertz frequency reflex klystrons. The tool, based on the Monte Carlo algorithm, includes loss mechanisms and takes into account the main peculiarities expected for device operation at terahertz frequencies. In this study, the tool is used to study the influence of the electron beam aperture angle and cavity dimensions (particularly the grid spacing) on ac power generation. The results demonstrate that aperture angles of less than 10 are necessary for the optimization of output power. It is also found that the power output is highly sensitive to the distance between the grids.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: micromachining, Monte Carlo (MC) simulation, reflex klystrons, terahertz sources
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 10 Oct 2005
Last Modified: 10 Jun 2014 01:21
Published Version: http://dx.doi.org/10.1109/TMTT.2004.835975
Status: Published
Refereed: Yes
Identification Number: 10.1109/TMTT.2004.835975
URI: http://eprints.whiterose.ac.uk/id/eprint/721

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