NDLI: Evaluation of aluminum nitride based RF lossy dielectrics for use in high power microwave devices

Content Provider	IEEE Xplore Digital Library
Author	Kirshner, M.F. Turek, L. Pekrul, E.
Copyright Year	2002
Description	Author affiliation: Northrop Grumman Electron. Syst., San Carlos, CA, USA (Kirshner, M.F.; Turek, L.; Pekrul, E.)
Abstract	Summary form only given. For the past three years, new aluminum nitride (AlN) based ceramics have been under development to replace a hot-pressed ceramic composition made from beryllia (BeO) and silicon carbide (SiC). The BeO-SiC composite is currently the material-of-choice to provide RF loss and high thermal conductivity within the vacuum envelopes of microwave tubes. However, increasingly stringent BeO health and safety regulations and liability issues have caused qualified domestic manufacturers to cease production. Experimental evaluation of the new AlN materials in specific microwave tube configurations is being carried out. Loss buttons of the new materials are fabricated and diffusion bonded into S-band klystron cavities for cold testing. The loaded cavity Q's and frequencies are compared to those obtained with buttons made from the standard BeO-SiC composition. Materials that exhibit RF behavior similar to BeO-SiC are then selected for high-power testing at X-band to determine their suitability for use in the severe environmental conditions existing inside a high power microwave tube.
Sponsorship	IEEE Electron Devices Soc
Starting Page	36
Ending Page	37
File Size	116005
Page Count	2
File Format	PDF
ISBN	0780372565
DOI	10.1109/IVELEC.2002.999247
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-04-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectric losses Aluminum nitride Radio frequency Dielectric devices Microwave devices Ceramics Silicon carbide Thermal conductivity Conducting materials Materials testing
Content Type	Text
Resource Type	Article

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