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Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications

Zuboraj, MD R
http://rave.ohiolink.edu/etdc/view?acc_num=osu1477947681829031

Abstract Details

2016, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
High power microwave devices especially Traveling Wave Tubes (TWTs) and Backward Wave Oscillators (BWOs) are largely dependent on Slow Wave Structures for efficient beam to RF coupling. In this work, a novel approach of analyzing SWSs is proposed and investigated. Speci cally, a rigorous study of helical geometries is carried out and a novel SWS "Half-Ring-Helix" is designed. This Half-Ring-Helix circuit achieves 27% miniaturization and delivers 10dB more gain than conventional helices. A generalization of the helix structures is also proposed in the form of Coupled Transmission Line (CTL). It is demonstrated that control of coupling among the CTLs leads to new propagation properties. With this in mind, a novel geometry referred to as "Curved Ring-Bar" is introduced. This geometry is shown to deliver 1MW power across a 33% bandwidth. Notably, this is the first demonstration of MW power TWT across large bandwidth. The CTL is further expanded to enable engineered propagation characteristics. This is done by introducing CTLs having non-identical transmission lines and CTLs with as many as four transmission lines in the same slow wave structure circuit. These non-identical CTLs are demonstrated to generate fourth order dispersion curves. Building on the property of CTLs, a `butterfly' slow wave structure is developed and demonstrated to provide degenerate band edge (DBE) mode. This mode are known to provide large eld enhancement that can be exploited to design high power backward wave oscillators.
John Volakis, Dr. (Advisor)
Niru Nahar, Dr. (Advisor)
124 p.
Electrical Engineering; Electromagnetics
Traveling Wave Tubes, Coupled Transmission Lines, Slow Waves, Slow Wave Structures, Degenerate Band Edge

Recommended Citations

Citations

  • Zuboraj, M. R. (2016). Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1477947681829031

    APA Style (7th edition)

  • Zuboraj, MD. Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications. 2016. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1477947681829031.

    MLA Style (8th edition)

  • Zuboraj, MD. "Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications." Doctoral dissertation, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1477947681829031

    Chicago Manual of Style (17th edition)

osu1477947681829031
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© 2016, some rights reserved.Creative Commons License Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications by MD R Zuboraj is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.