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Title: Transmitting adaptive array antenna

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.more » 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 adjusted in a manner to optimize a desired parameter.« less

Inventors:
Publication Date:
OSTI Identifier:
5674510
Patent Number(s):
US 4492962
Assignee:
EDB-85-104992
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 31 Aug 1981; Other Information: PAT-APPL-297598
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ANTENNAS; DATA TRANSMISSION; RADIO EQUIPMENT; AMPLIFIERS; COMMUNICATIONS; MICROPROCESSORS; OPERATION; OPTIMIZATION; PERFORMANCE; RADIO EQUIPMENT POWER SUPPLIES; SIGNALS; TELEMETRY; COMPUTERS; ELECTRICAL EQUIPMENT; ELECTRONIC CIRCUITS; ELECTRONIC EQUIPMENT; EQUIPMENT; MICROELECTRONIC CIRCUITS; POWER SUPPLIES; 420800* - Engineering- Electronic Circuits & Devices- (-1989)

Citation Formats

Hansen, P M. Transmitting adaptive array antenna. United States: N. p., 1985. Web.
Hansen, P M. Transmitting adaptive array antenna. United States.
Hansen, P M. Tue . "Transmitting adaptive array antenna". United States.
@article{osti_5674510,
title = {Transmitting adaptive array antenna},
author = {Hansen, P M},
abstractNote = {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 adjusted in a manner to optimize a desired parameter.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}