Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-07-03
1982-06-08
Lieberman, Eli
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343854, 455276, H01Q 326, H01Q 2126
Patent
active
043342302
ABSTRACT:
A variable tuning unit, including voltage variable-reactance circuits and a reactance element for adjusting the impedance, is electrically connected to the feed side of an antenna element which is formed of transmission lines in a zigzag configuration and having a distributed inductance, thereby constituting an antenna circuit. A plurality of reference dipole antennas forming such antenna circuits are provided to form an antenna configuration of the phased array type or Yagi type. Voltage variable-capacitors are interconnected within the voltage variable-reactance circuits and the feed terminal of the antenna configuration is connected to the input terminal of a remote radio receiver through a coaxial cable, so that RF signals received by the antenna are supplied to the receiver. A D.C. tuning control voltage, generated by the radio receiver, is fed to a voltage variable-capacitor within the voltage variable-reactance circuit by way of the coaxial cable.
A slightly different D.C. tuning control voltage is fed to each reference dipole antenna constituting the antenna configuration, so that the resonance of each reference dipole antenna is delayed to generate phase differences between the reference dipole antennas, resulting in the control of the directivity of the antenna configuration. The slight voltage differences of the D.C. tuning control voltages are controlled by a detected signal from the remote radio receiver. Hence, the controlled directivity antenna system forms a closed loop functioning to control the directivity of the antenna configuration on a basis of a received radio wave signal.
REFERENCES:
patent: 3056961 (1962-10-01), Mitchell
patent: 4123759 (1978-10-01), Hines et al.
patent: 4193077 (1980-03-01), Greenberg et al.
patent: 4213133 (1980-07-01), Hidaka
Lieberman Eli
Matsushita Electric - Industrial Co., Ltd.
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