Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1978-09-25
1980-06-24
Lieberman, Eli
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343890, H01Q 134, H01Q 303
Patent
active
042097894
ABSTRACT:
Slip-ring electrical contacts are avoided in a rotatable aerial or antenna of the type which is housed in a rotatable cage or basket having a supporting platform at the top of a mast, by constructing the electrical transmitting/receiving apparatus and the drive and control units for the rotating aerial at some region below the supporting platform for the rotating cage or basket, e.g., below deck in the case of a ship, and by transmitting the signal to or from the aerial by means of a wave guide concentrically arranged below and surrounding the axis of rotation of the cage, including a quarter wave joint surrounding the wave guide (with a clearance) on the platform, and connecting the wave guide to the aerial with the aid of a probe extending into the wave guide, two motor devices operating through differential gearing, all included in the region below the platform enabling the azimuth and elevation of the aerial to be determined.
REFERENCES:
patent: 3495261 (1970-02-01), Lastinger et al.
patent: 3624656 (1971-11-01), Kaschak
patent: 3707721 (1972-12-01), McCartney
BBC Brown Boveri & Company Limited
Durr Frank L.
Greene Orville N.
Lieberman Eli
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