Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1986-12-01
1989-02-07
Sikes, William L.
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343715, 343723, 343861, 343901, H01Q 110, H01Q 322
Patent
active
048034932
ABSTRACT:
A mobile antenna circuit for resonant transmitting from an RF signal source may comprise: an antenna having a base and at least first and second conductive sections one of which is extendable and retractable to lengthen and shorten the antenna; a motor operatively connected to one of the conductive sections for extending and retracting the antenna in response to control signals thereto; an impedance matching circuit coupling the RF signal source to the base of the antenna for matching impedance thereof at a specified frequency; and control components connected to the motor to produce control signals for extending and retracting the antenna section so as to resonantly tune the antenna at a specified frequency. The circuit may include a phase angle detector connected between the RF signal source and the impedance matching circuit for developing a voltage differential being fed to the control components for producing the control signals for extending and retracting the antenna section.
REFERENCES:
patent: 2719920 (1955-10-01), Ellis
patent: 2855599 (1958-10-01), Kandoian
patent: 3381222 (1968-04-01), Gray
patent: 3671932 (1972-06-01), Spilsbury et al.
patent: 3909830 (1975-09-01), Campbell
patent: 4506266 (1985-03-01), Mizuno et al.
Berryhill Bill B.
Johnson Doris J.
Sikes William L.
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