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Coupled Transmission Line Based Slow...

Zuboraj, Md. Rashedul Alam.

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

Record Type:	Electronic resources : Monograph/item
Title/Author:	Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications./
Author:	Zuboraj, Md. Rashedul Alam.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	124 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
Contained By:	Dissertation Abstracts International78-07B(E).
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10403782
ISBN:	9781369597264

Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications.
Zuboraj, Md. Rashedul Alam.

Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 124 p.

Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.

Thesis (Ph.D.)--The Ohio State University, 2016.

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. Specifically, 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 feld enhancement that can be exploited to design high power backward wave oscillators.

ISBN: 9781369597264Subjects--Topical Terms:

649834
Electrical engineering.

Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications.
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245 1 0 $a Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications.
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300 $a 124 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
500 $a Advisers: John Volakis; Niru Nahar.
502 $a Thesis (Ph.D.)--The Ohio State University, 2016.
520 $a 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. Specifically, 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 feld enhancement that can be exploited to design high power backward wave oscillators.
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650 4 $a Electromagnetics. $3 3173223
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