High frequency wave radiation system producing a rotating beam d

Details High frequency wave radiation system producing a rotating beam d High frequency wave radiation system producing a rotating beam d

1975-09-02

1976-09-28

Lieberman, Eli

Communications: radio wave antennas

Antennas

Including magnetic material

343106R, 343778, 343854, G01S 148

Patent

active

039835618

ABSTRACT:
An electromagnetic wave radiation system includes an array of stationary antenna elements, a multiplicity of phase modulator units coupled to the antenna elements, a source of high frequency energy supplying energy to the antenna array, and modulator driving means activating the same to cause phase displacement and rotation of the beam transmitted by the antenna elements. The antenna may be a discone assembly or an assembly of antenna elements in a circular configuration, and the modulator units may be passive ferrite members located in the aperture of the antenna. The modulator driving units may comprise electromagnets located below the ground plane of the antenna and alternatively or selectively energized by in-phase and phase shifted sine wave voltages. One group of modulator units may be closely grouped around the central source of high frequency energy to generate a cardioid pattern and another group of modulator units may be arranged in a circle around the periphery of the antenna to generate a multiple lobed pattern. Both groups of modulator units may be activated simultaneously at different frequencies to produce a combined cardioid and multiple-lobed pattern.

REFERENCES:
patent: 3087158 (1963-04-01), Fisch
patent: 3093828 (1963-06-01), Stutz
patent: 3246332 (1966-04-01), Waldman et al.
patent: 3560978 (1971-02-01), Himmel et al.

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