Electronic-tuning type radio-frequency tuning circuit

Details Electronic-tuning type radio-frequency tuning circuit Electronic-tuning type radio-frequency tuning circuit

1997-01-03

1999-01-26

Ham, Seungsook

Tuners

Mutual inductance variable means

333174, 333177, H03J 300, H03H 709

Patent

active

058642676

ABSTRACT:
A radio-frequency tuning circuit includes an input tuning transformer, and an output tuning transformer. The input tuning transformer comprises a primary coil adapted to serve as input coil, and a secondary coil to which a pair of variable-capacitance diodes having cathodes thereof connected together are connected in parallel therewith to form a first tuning circuit. The output tuning transformer comprises a primary coil to which a variable-capacitance element is connected to form a second tuning circuit, and a secondary coil adapted to serve as output coil. The input and output tuning transformers are connected in such a manner as to form a double-tuning circuit. Q-factor of the output tuning transformer is made to be twice as high as that of the input tuning transformer, and resonant impedance of the first tuning circuit and that of the second tuning circuit are made to be substantially equal to each other.

REFERENCES:
patent: 1944119 (1934-01-01), Braden
patent: 2104792 (1938-01-01), Crossley et al.
patent: 2194566 (1940-03-01), Mountjoy
patent: 2234461 (1941-03-01), Tubbs
patent: 2238763 (1941-04-01), Winkler

Affiliated with

Also associated with

Rating

Electronic-tuning type radio-frequency tuning circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic-tuning type radio-frequency tuning circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic-tuning type radio-frequency tuning circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1453102