Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-08-31
1985-01-08
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 502
Patent
active
044929625
ABSTRACT:
A low-power adaptive array for transmitting a signal may be used by itself in low-power applications or in high-power applications in conjunction with a commercial radio transmitter to optimize the radiation field of the transmitter used. The adaptive system comprises a continuous-wave (C-W) signal source having a certain amount of power. A power divider hybrid circuit, whose input is connected to the output of the C-W generator, divides its output power into N+1 parts. N quadrature hybrid circuits, one in each of N channels, whose inputs are connected to the output of the power divider hybrid circuit, divide their input signals into two quadrature components. One channel, a reference channel, does not require a quadrature circuit. A plurality of attenuators, each having inputs from the power divider hybrid circuit and the quadrature hybrid circuits, attenuates the power received from the quadrature hybrid circuit. A summer, having two inputs which are connected to the two outputs of its respective attenuator, sums its input signals. A linear amplifier, whose input is connected to the output of the summer, amplifies its input signal. An impedance matching network receives the signal from the linear amplifier and matches it to the input to an antenna. A plurality of monitors, distributed at various strategic locations within the environment, receives and monitors the phase and amplitude of the transmitted signal at the several locations. An antenna current monitor collects the currents from all the monitors, and transmits them by telemetry to a monitoring circuit, which transmits them directly to a microprocessor. The microprocessor, whose input is connected to the receiver of the monitored signals and whose output is connected to the inputs of the attenuators, processes the monitored signals and sends signals to the attenuator, to cause the attenuator to be adapted, that is, adjusted, in a manner to optimize a desired parameter, for example maximum power in a given direction.
REFERENCES:
patent: 3390335 (1968-06-01), Miyagi
patent: 3518585 (1970-06-01), Wilcox
patent: 3631344 (1971-12-01), Greenwald
patent: 3879733 (1975-04-01), Hansen et al.
patent: 4041496 (1977-08-01), Norris
patent: 4117494 (1978-09-01), Frazita
patent: 4220954 (1980-09-01), Marchand
patent: 4316159 (1982-02-01), Ho
patent: 4348676 (1982-09-01), Tom
Beers Robert F.
Blum Theodore M.
Johnston Ervin F.
Rusche, Jr. Edmund W.
Steinberger Brian
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