Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-12-20
1980-09-02
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343120, G01S 502
Patent
active
042209544
ABSTRACT:
In an adaptive antenna system, the output of the discriminator of an FM receiver is synchronously rectified, in synchronism with commutation of the input thereof between a pair of antennas, to provide an output signal. When the inputs of the receiver are coupled directly to the antennas, the system may be employed in a homing mode. The output of the rectifier may alternatively be employed to control amplitude and/or phase controls connected between a pair of antennas and the input circuits of the receiver, for the use of the receiver in an adaptive system. For control of amplitude, a quadrature hybrid may be connected between the antennas and the input circuit of the receiver, in order to balance the amplitude of the received signals. In a further arrangement, the inputs to the receiver may be coupled to a sum-difference hybrid coupled to the antennas by way of phase and amplitude control devices, the inputs to the receiver being controlled on a time sharing basis to enable use of the same receiver for controlling the adaptation of the antennas and for receiving intelligent signals. The control functions of this system may be effected in accordance with a programmed control circuit.
REFERENCES:
patent: 3466654 (1969-09-01), Abronson
patent: 3872477 (1975-03-01), King
patent: 3964065 (1976-06-01), Roberts et al.
patent: 4107692 (1978-08-01), Hutcheon et al.
Blum Theodore M.
Marchand Electronic Laboratories, Incorporated
Miller Alfred E.
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