Radar system and components therefore for transmitting an electr

Communications: radio wave antennas – Antennas – Spiral or helical type

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343788, 343876, 343705, H01Q 1108, H01Q 100

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active

056336497

ABSTRACT:
An antenna for transmitting electromagnetic signals having a frequency less than 500 Hz includes a beam of dielectric material and a conductive sheet wound in a helical pattern around the beam of dielectric material. The antenna further includes a core fabricated from a silicon and iron alloy, the cote disposed between the beam of dielectric material and the conductive sheet. With such an arrangement, a magnetic dipole antenna is provided capable of providing a magnetic moment of approximately 10.sup.6 to 10.sup.7 Am.sup.2.

REFERENCES:
patent: 3972044 (1976-07-01), Alford
patent: 4323900 (1982-04-01), Krall et al.
patent: 4712112 (1987-12-01), Carr
patent: 4760362 (1988-07-01), Maki
patent: 4845506 (1989-07-01), Shibata et al.
patent: 5081468 (1992-01-01), Williams
patent: 5220338 (1993-06-01), Matsushita
patent: 5268703 (1993-12-01), Wingard
"Air/Undersea Communication at Ultra-Low-Frequencies Using Airborne Loop Antennas," A. C. Fraser-Smith et al., Stanford Electronics Laboratories, Jun. 1977, Technical Report No. 4207-6, pp. iii-vii-1-75.

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