Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1995-05-12
1997-06-03
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Spiral or helical type
343860, H01Q 136, H01Q 138
Patent
active
056359454
ABSTRACT:
A quadrifilar helix antenna for use in satellite communications comprises four conductive elements arranged to define two separate helically twisted loops, one slightly differing in electrical length than the other, to define a cylinder of constant radius supported by itself or by a cylindrical non-conductive substrate. The two separate helically twisted loops are connected to each other in such a way as to constitute the impedance matching, electrical phasing, coupling and power distribution for the antenna. In place of a conventional balun, the antenna is fed at a tap point on one of the conductive elements determined by an impedance matching network which connects the antenna to a transmission line. The matching network can be built with distributed or lumped electrical elements and can be incorporated into the design of the antenna.
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Barta Gary S.
McConnell Richard J.
Nicoles James C.
Le Hoanganh T.
Magellan Corporation
Virga Philip T.
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