Antenna system

Details Antenna system Antenna system

1986-07-22

1988-05-03

Sikes, William L.

Communications: radio wave antennas

Antennas

Spiral or helical type

343840, H01Q 136

Patent

active

047423595

ABSTRACT:
A parabolic antenna for SHF band having a primary feeder and a reflector is improved by using a backfire helical antenna as a primary feeder, which is fed by using a coaxial cable. The backfire helical antenna has a matching disc coupled with an outer conductor of the coaxial cable feeder, and a coil, one end of which is coupled with an inner conductor of said coaxial cable. The other end of the coil is free standing. The coil is positioned so that the axis of the coil coincides with the axis of the reflector, and the feed end of the coil locates nearer to the reflector than the free standing end of the coil. The present antenna is useful in particular for a receiving antenna for a direct satellite broadcasting.

REFERENCES:
patent: 3184747 (1965-05-01), Kach

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