Antenna tuning circuit

Details Antenna tuning circuit Antenna tuning circuit

1997-10-22

1999-11-02

Loomis, Paul

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551933, 4551912, 4551804, 333174, H04B 118

Patent

active

059786639

ABSTRACT:
An antenna tuning circuit of a tuner with a band switching device, which can eliminate an image disturbance and a disturbance due to a UHF band frequency at reception of a high band and further eliminate a disturbance at a frequency higher than the image frequency at reception of a low band. At the reception of a high band, a coil 32 is provided to be connected between an input terminal 2 and a first high-band coil 9, and a first trap circuit 34 including a first capacitor 14 and the coil 32 is established between the input terminal 2 and an output terminal 4, and further a second trap circuit 35 including a second capacitor 15 and a second high-band coil 11 is formed therebetween.

REFERENCES:
patent: 3866138 (1975-02-01), Putzer
patent: 4048598 (1977-09-01), Knight
patent: 4418428 (1983-11-01), Evans
patent: 5202656 (1993-04-01), Clark et al.
patent: 5291159 (1994-03-01), Vale
patent: 5412310 (1995-05-01), Wolk et al.
patent: 5541558 (1996-07-01), Weber et al.

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