Vacuum-barrier window for wide-bandwidth high-power microwave transmission
Abstract
A vacuum output window comprises a planar dielectric material with identical systems of parallel ridges and valleys formed in opposite surfaces. The valleys in each surface neck together along parallel lines in the bulk of the dielectric. Liquid-coolant conduits are disposed linearly along such lines of necking and have water or even liquid nitrogen pumped through to remove heat. The dielectric material can be alumina, or its crystalline form, sapphire. The electric-field of a broadband incident megawatt millimeter-wave radio frequency energy is oriented perpendicular to the system of ridges and valleys. The ridges, about one wavelength tall and with a period of about one wavelength, focus the incident energy through in ribbons that squeeze between the liquid-coolant conduits without significant losses over very broad bands of the radio spectrum. In an alternative embodiment, the liquid-coolant conduits are encased in metal within the bulk of the dielectric.
- Inventors:
-
- Fremont, CA
- Tracy, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 870576
- Patent Number(s):
- 5548257
- Assignee:
- Regents of University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01P - WAVEGUIDES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- vacuum-barrier; window; wide-bandwidth; high-power; microwave; transmission; vacuum; output; comprises; planar; dielectric; material; identical; systems; parallel; ridges; valleys; formed; opposite; surfaces; surface; neck; lines; bulk; liquid-coolant; conduits; disposed; linearly; necking; water; liquid; nitrogen; pumped; remove; heat; alumina; crystalline; form; sapphire; electric-field; broadband; incident; megawatt; millimeter-wave; radio; frequency; energy; oriented; perpendicular; wavelength; tall; period; focus; ribbons; squeeze; significant; losses; broad; bands; spectrum; alternative; embodiment; encased; metal; opposite surfaces; high-power microwave; incident energy; remove heat; radio frequency; alternative embodiment; dielectric material; opposite surface; broad band; liquid nitrogen; power microwave; frequency energy; window comprises; oriented perpendicular; output window; parallel lines; millimeter-wave radio; crystalline form; significant loss; wave radio; site surface; /333/29/
Citation Formats
Caplan, Malcolm, and Shang, Clifford C. Vacuum-barrier window for wide-bandwidth high-power microwave transmission. United States: N. p., 1996.
Web.
Caplan, Malcolm, & Shang, Clifford C. Vacuum-barrier window for wide-bandwidth high-power microwave transmission. United States.
Caplan, Malcolm, and Shang, Clifford C. Mon .
"Vacuum-barrier window for wide-bandwidth high-power microwave transmission". United States. https://www.osti.gov/servlets/purl/870576.
@article{osti_870576,
title = {Vacuum-barrier window for wide-bandwidth high-power microwave transmission},
author = {Caplan, Malcolm and Shang, Clifford C},
abstractNote = {A vacuum output window comprises a planar dielectric material with identical systems of parallel ridges and valleys formed in opposite surfaces. The valleys in each surface neck together along parallel lines in the bulk of the dielectric. Liquid-coolant conduits are disposed linearly along such lines of necking and have water or even liquid nitrogen pumped through to remove heat. The dielectric material can be alumina, or its crystalline form, sapphire. The electric-field of a broadband incident megawatt millimeter-wave radio frequency energy is oriented perpendicular to the system of ridges and valleys. The ridges, about one wavelength tall and with a period of about one wavelength, focus the incident energy through in ribbons that squeeze between the liquid-coolant conduits without significant losses over very broad bands of the radio spectrum. In an alternative embodiment, the liquid-coolant conduits are encased in metal within the bulk of the dielectric.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1996},
month = {Mon Jan 01 00:00:00 EST 1996}
}
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
Night Moth Eye Window for the Millimetre and Sub-millimetre Wave Region
journal, December 1983
- Ma, J. Y. L.; Robinson, L. C.
- Optica Acta: International Journal of Optics, Vol. 30, Issue 12
Electromagnetic and thermal analysis of distributed cooled high power millimeter wave windows
conference, January 1996
- Nelson, Scott D.; Reitter, Thomas; Caplan, Malcolm
- The 11th topical conference on radio frequency power in plasmas, AIP Conference Proceedings
Surface corrugation for broadband matching of windows in powerful microwave generators
journal, November 1991
- Petelin, M. I.; Kasparek, W.
- International Journal of Electronics, Vol. 71, Issue 5
Electrical analysis of wideband and distributed windows using time-dependent field codes
conference, November 2017
- Shang, C. C.
- 18th International Conference on Infrared and Millimeter Waves