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[天线]Hybrid Antenna-Sources for Radiating High-Power Impulsive Fields

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0楼发表于: 2009-03-16 23:46:39

C. Jerald Buchenauer and J. Raley Marek
Phillips Lab I WSR
Kirtland AFB, NM 87117
ABSTRACT
The transmission of impulsive signals through baluns and feed lines, between high-power, fast-risetime pulse
generators and impulse-radiating antennas, leads to degraded system performance and increased pulse risetime due
to transit-time dispersion, skin and dielectric losses, and electrical breakdown effects. These loss mechanisms are
greatly reduced in system designs that eliminate feed lines and baluns by combining the antenna and generator in
a single hybrid device that is compact, simple, and robust. This paper describes generators in which the antenna
itself is pulse charged to hundreds of kV and subsequently shorted at the feed point by an oil spark switch. These
Hertzian generators maintain conical symmetry to within a few millimeters of the feed-point switch, thus providing
conditions for launching near-ideal spherical ThM step waves for driving impulse-radiating, focused-aperture
antennas. Careful attention to symmetry, optical principles, and precise methods of measurement has yielded
subnanosecond pulse risetimes that are more than ten times faster than predictions from spark-switch scaling laws.
Keywords: electromagnetic pulse (EMP) generators, microwave generators, o ..

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