Composite antenna for receiving signals transmitted simultaneous

Details Composite antenna for receiving signals transmitted simultaneous Composite antenna for receiving signals transmitted simultaneous

1992-06-26

1994-05-31

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Plural separate diverse type

343790, 343895, H01Q 136

Patent

active

053173279

ABSTRACT:
An antenna comprises a quarter-wavelength skirt antenna adapted to be disposed over an artificial ground and comprising a vertical cylindrical tube closed at the upper end and a coaxial feed inside the tube. The radiation pattern of the skirt antenna is essentially omnidirectional with a low elevation angle. The skirt antenna is combined with a helical antenna disposed vertically above the skirt antenna and coaxially therewith. The surface closing the upper part of the tube of the skirt antenna constitutes a reflective plane for the helical antenna favoring a hybrid radiation mode specific to the latter, partially axial and partially radial, by lowering the receive lobe of the radiation pattern towards an elevation angle suitable for receiving signals transmitted via satellite. A coupling device combines the signals received by each of the two antennas and feeds them to a common coaxial line.

REFERENCES:
patent: 2531476 (1950-11-01), Schriefer
patent: 2781514 (1957-02-01), Sichak et al.
patent: 3184747 (1965-05-01), Kach
patent: 3523251 (1970-08-01), Halstead
patent: 4282528 (1981-08-01), Aspinwall
patent: 4442438 (1984-04-01), Siwiak et al.
patent: 4494122 (1985-01-01), Garay et al.
patent: 4730195 (1988-03-01), Phillips et al.

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