Communications: radio wave antennas – Antennas – With aircraft
Patent
1979-12-26
1981-09-08
Lieberman, Eli
Communications: radio wave antennas
Antennas
With aircraft
343742, 343744, 343842, H01Q 128, H01Q 704
Patent
active
042887941
ABSTRACT:
A VOR/ILS antenna system for rotor aircraft eliminates rotor modulation of signals without varying rotor speed. The system comprises one or more loop antennas each having one or more closed loop windings mounted on the aircraft in a generally horizontal plane and having a conductive shield covering the windings and dielectrically separated therefrom and having a small gap breaking the continuity thereof. A dual loop VOR/ILS system for helicopters is particularly disclosed wherein the pair of loop antennas are mounted in a horizontal plane on opposite sides of the central vertical helicopter mast extending upwardly between a pair of cowling members in which the antennas are disposed. Each antenna has a gap in the shield facing inboard and a connection point for the windings opposite the gap and outboard. The connection point provides a lobe in the individual radiation pattern of the respective loop antenna which is outboard relative to the mast and which compensates an otherwise null point in the composite radiation pattern of the pair of loop antennas whereby to provide an omnidirectional composite radiation pattern. The helicopter itself further compensates the otherwise null point to provide in combination with the dual loop antenna system a substantially circular radiation pattern. Antenna construction is also disclosed.
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Osborne Gregory W.
Ripley William C.
Wilson Robert E.
Lieberman Eli
Textron Inc.
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