Capacitor analysis for rf antennas

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Commercially available vacuum capacitors have been used in radio frequency (rf) antenna designs. The dimensional envelope of the capacitors has adapted favorably to antenna concepts. However, capacitors that are commercially available have not demonstrated acceptable performance characteristics for maximum design currents of 800 A rms at 80 MHz and 1300 A rms at 30 MHz or for voltages of 50 kV peak. The reason for capacitor failure was investigated. The investigation consisted of establishing existing mechanical design features, defining desired operating criteria of key capacitor components, determining component design limitations, and developing a modified concept for testing. The design criteria ... continued below

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Pages: 4

Creation Information

Power, W.H.; Baity, F.W. & Hoffman, D.J. January 1, 1987.

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Description

Commercially available vacuum capacitors have been used in radio frequency (rf) antenna designs. The dimensional envelope of the capacitors has adapted favorably to antenna concepts. However, capacitors that are commercially available have not demonstrated acceptable performance characteristics for maximum design currents of 800 A rms at 80 MHz and 1300 A rms at 30 MHz or for voltages of 50 kV peak. The reason for capacitor failure was investigated. The investigation consisted of establishing existing mechanical design features, defining desired operating criteria of key capacitor components, determining component design limitations, and developing a modified concept for testing. The design criteria included a variable capacitance range of 50 to 450 pF at the maximum current conditions. Effects of capacitor cooling by means of radiative transfer and forced convective transfer were considered. The resulting modified capacitor design concept uses as many components of the commercially available capacitors as possible. An apparatus for testing and evaluation was designed for the proposed capacitor concepts. Tests have demonstrated reliable operations at 750 A and 80 MHz cw on a similar design. 2 refs., 5 figs.

Physical Description

Pages: 4

Notes

NTIS, PC A02; 3.

Source

  • 12. symposium on fusion engineering, Monterey, CA, USA, 12 Oct 1987

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  • Other: DE88004178
  • Report No.: CONF-871007-82
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5576712
  • Archival Resource Key: ark:/67531/metadc1093806

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 1987

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • Feb. 20, 2018, 10:05 p.m.

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Power, W.H.; Baity, F.W. & Hoffman, D.J. Capacitor analysis for rf antennas, article, January 1, 1987; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1093806/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.