Around-the-mast rotary annular antenna feed coupler

Details Around-the-mast rotary annular antenna feed coupler Around-the-mast rotary annular antenna feed coupler

1979-12-07

1981-03-24

Moore, David K.

Communications: radio wave antennas

Antennas

With means for moving directive antenna for scanning,...

333261, H01Q 300

Patent

active

042583659

ABSTRACT:
An annular rotary antenna feed coupler especially for around-the-mast use, as on shipboard. A housing in the general shape of a cylinder with a central axial opening essentially concentric with the axial center line of the housing contains a circumferential distribution of a number of fixed axially elongated, conductive loops each with a feed port. Radially spaced therefrom, a second, group of elongated conductive loops circumferentially distributed about a circle of different radius as compared to the aforementioned fixed loops is rotatably mounted. A corresponding plurality of ports, one for each rotating loop, is also provided, and input and output combiner/divider devices, one for the fixed and another for the rotating sub-assemblies serve to combine all ports into a single fixed and a single rotating port. Mechanically, the rotating combiner/divider rotates with the antenna array with which it operates.

REFERENCES:
patent: 2426226 (1947-08-01), Labin et al.
patent: 3066291 (1962-11-01), Alford
patent: 3123782 (1964-03-01), Parisi

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