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Proceedings Paper

Photonic band gap structures for millimeter-wave traveling wave tubes
Author(s): Aimee G. Bailey; Evgenya I. Smirnova; Lawrence M. Earley; Bruce E. Carlsten; James L. Maxwell
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Paper Abstract

We propose to use photonic band gap (PBG) structures for constructing traveling wave tubes (TWTs) at 100 GHz, a completely novel approach. Using a PBG fiber allows us to create an all-dielectric slow-wave structure with very large band width and low losses in the mm-wave regime, compared to TWTs made out of metals. Additional capabilities such as mode selectivity are also achievable. We designed two 100 GHz pencil beam PBG TWTs using Ansoft's HFSS, 3D electromagnetic simulation software for high frequency applications. The first design is a periodic array of vacuum rods in a dielectric matrix, with a smaller vacuum rod forming the line defect. A fiber drawing procedure is being utilized to construct this design out of fused silica. The second structure is a periodic array of dielectric rods in a vacuum matrix, surrounding a thick hollow dielectric tube that accommodates the electron beam. This model is being fabricated out of silicon by means of high-pressure laser chemical vapor deposition (HP-LCVD), a versatile approach to synthesize fibers from the vapor phase. Additionally, a scaled 10 GHz cold test made from alumina rods is being produced for design confirmation purposes, and a 100 GHz sheet beam PBG TWT is being investigated for even greater power generation.

Paper Details

Date Published: 7 March 2006
PDF: 8 pages
Proc. SPIE 6120, Terahertz and Gigahertz Electronics and Photonics V, 612004 (7 March 2006); doi: 10.1117/12.649396
Show Author Affiliations
Aimee G. Bailey, Los Alamos National Lab. (United States)
Univ. of Pennsylvania (United States)
Evgenya I. Smirnova, Los Alamos National Lab. (United States)
Lawrence M. Earley, Los Alamos National Lab. (United States)
Bruce E. Carlsten, Los Alamos National Lab. (United States)
James L. Maxwell, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 6120:
Terahertz and Gigahertz Electronics and Photonics V
R. Jennifer Hwu; Kurt J. Linden, Editor(s)

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