NDLI: Investigations on a microfabricated FWTWT oscillator

Content Provider	IEEE Xplore Digital Library
Author	Seong-Tae Han Jin-Kyu So Kyu-Ha Jang Young-Min Shin Jong-Hyun Kim Suk-Sang Chang Ryskin, N.M. Gun-Sik Park
Copyright Year	1963
Abstract	A vacuum tube oscillator fabricated by the deep etch X-ray lithography: lithographie, galvanoformung, abformung (LIGA) process was successfully developed for the first time. For the proof-of-concept experiment involving a delayed feedback oscillator, a folding-waveguide traveling-wave tube (FWTWT) was fabricated by computer numerical control milling in advance. With a 12.4-kV and 150-mA electron beam, a Ka-band FWTWT amplifier shows a linear gain of 25 dB and a bandwidth of 10%. Applying a delayed feedback scheme, the threshold feedback strengths for the onset of oscillation and for self-modulation were measured to be -30 dB and -16 dB, respectively. The optimum value of the feedback strength for the single-frequency oscillation at 32.5 GHz was about -18 dB with a net electronic efficiency of 6%. The LIGA-fabricated FWTWT circuit was constructed by a lithographic process using the synchrotron X-ray source at the Pohang Light Source. The resulting accuracy and average surface roughness were less than 10 and 1 /spl mu/m, respectively. The LIGA-fabricated Ka-band amplifier shows a linear gain of 15 dB and bandwidth of 1.7% with a 12.4-kV, 47-mA electron beam. The threshold for the onset of oscillation was about -11 dB and the optimum value of feedback strength for a single frequency oscillation at 35 GHz with a net electronic efficiency of 3.5% was about -8 dB.
Sponsorship	IEEE Electron Devices Society
Starting Page	702
Ending Page	708
Page Count	7
File Size	1918326
File Format	PDF
ISSN	00189383
Volume Number	52
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Traveling wave amplifiers Millimeter wave tubes Millimeter wave oscillators Traveling wave tubes Distributed feedback oscillators Waveguide components Etching X-ray lithography lithographie, galvanoformung, abformung (LIGA) Deep etch X-ray lithography delayed feedback oscillator folding–waveguide traveling-wave tube (FWTWT)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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