Submillimeter backward wave oscillators
- 49 Downloads
NASA Lewis Research Center is engaged in a program to develop a series of backward wave oscillators (BWO's) for the frequency range 500 to 2000 GHz. Generically BWO's are electron beam traveling wave tubes operating in a dispersive regime in which the group velocity and the phase velocity of the induced electromagnetic wave are in opposite directions. The oscillation frequency of a BWO is controlled by the electron beam velocity (anode voltage).
Such tubes because of their frequency tunability, phase locking capability, and large bandwidth are ideal local oscillators for heterdyne receiver/spectrometers.
The design of the BWO's will be discussed with emphasis on the etched slow wave structure, zero compression electron beam, long life cathode, and moderate operating voltages.
KeywordsElectron Beam Slow Wave Wave Structure Operating Voltage Frequency Tunability
Unable to display preview. Download preview PDF.
- G. Kantorowicz, and P. Palluel, InInfrared and Millimeter Waves, edited by K.J. Button, Academic Press, New York, 1979), Vol. 1, Chapter 4, pp. 185–212.Google Scholar
- L. Teyssier and B. Epsztein, “Advances in Submillimeter Carcinotrons,”Eighth International Conference on Infrared and Millimeter Waves, (IEEE, Piscataway, NJ, 1983), Paper W2.2.Google Scholar
- M.B., Golant, Z.T. Alekseenko, Z.S. Korotkova, L.A. Lunkina, A.A. Negirev, O.P. Petrova, T.B. Rebrova, V.S. Savel'ev, “Wide-Range Oscillators for the Submillimeter Wavelengths,” Instrum. Exp. Tech. Engl. Transl., 801–802, (1969).Google Scholar
- A. Karp, “Backward-Wave Oscillator Experiments at 100 to 200 Kilomegacycles, Proc. IRE, 45, 496–503 (1957).Google Scholar
- L.D. Cohen, “Backward-Wave Oscillators for the 50- to 300-GHz Frequency Range,” IEEE Trans. Electron Devices, EE-15, 403–404 (1968)Google Scholar
- R.W. Grow, and D.R. Gunderson, “Starting Conditions for Backward Wave Oscillators With Large Loss and Large Space Charge,” IEEE Trans. Electron Devices, ED-17, 1032–1039 (1970).Google Scholar
- K. Ishibori, J. Takezawa, and I. Takasaki, “Millimeter-Wave Backward-Wave Oscillators,” Rev. Electr. Commun. Lab., 23, 960–967 (1975).Google Scholar
- J.W. Gewartowski, and H.A. Watson,Principles of Electron Tubes, (Van Nostrand, Princeton, 1965).Google Scholar
- G. Hermann, “Optical Theory of Thermal Velocity Effects in Cylindrical Electron Beams,” J. Appl. Phys., 29, 127–136 (1958).Google Scholar
- L.R. Barnett, J.W. Baird, R.W. Grow, and S.G. Holmes, In1985 International Electron Devices Meeting Technical Digest, (IEEE, Piscataway, NJ, 1985) pp. 13.7–13.8.Google Scholar
- N.N. Efremow, M.W., Geis, D.C. Flanders, G.A. Lincoln, and N.P. Economou, “Ion-Beam-Assisted Etching of Diamond,” J. Vac. Sci. Technol. B., 3, 416–418 (1985).Google Scholar