Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-06-27
1979-11-27
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343117A, 325369, H04B 700
Patent
active
041763564
ABSTRACT:
A directional antenna system is disclosed which selectively couples two radiating antenna elements to a transceiver through a selective phase, magnitude and matching network which is controlled by the output of a logic circuit. The network provides for equal magnitude current coupling between the transceiver and the two antennas while simultaneously selectively producing either positive or negative approximately 90.degree. phase shifts between the two antennas to produce either of two discrete directive cardioid radiation patterns directed in substantially opposite directions. The logic circuit, in conjunction with a manual step switch, provides for a manually selecting either of the two cardioid radiation patterns, as well as producing a figure eight or an omnidirectional radiation pattern. For generating a transceiver omnidirectional pattern, one antenna is used and the other is connected to a standard broadcast band receiver. Matching networks are simultaneously selectively connected between the two antennas and the transceiver such that maximum power transfer and impedance matching is maintained for different radiation patterns. An automatic scanning switch is coupled to the logic circuit and provides for automatically selecting one of the cardioid radiation patterns as an optimum pattern in which the signal from the remote site is most strongly received by the transceiver. Indicating lights are provided to indicate which one of the radiation patterns is generated for the transceiver.
REFERENCES:
patent: 2786133 (1957-03-01), Dyke
patent: 3453623 (1969-07-01), Blackband et al.
patent: 3568197 (1971-03-01), Cubley
Foster L. Curtis
Lindholm Carl E.
Blum Theodore M.
Gillman James W.
Melamed Phillip H.
Motorola Inc.
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