Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1988-11-22
1991-07-02
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333175, 334 15, H03H 712
Patent
active
050288946
ABSTRACT:
A bandpass filter circuit arrangement in which a pair of parallel-resonant circuits (1, 2) are reactively intercoupled has a pair of signal input terminals (16, 17) connected to one of the resonant circuits (1) and a pair of output terminals (18, 19) connected to the other resonant circuit (2). Tuning of the filter is accomplished by varying the capacitive component of each circuit by varying the output of a tuning voltage source (20). In order to compensate for the deviation from the optimum intercoupling which would otherwise occur with change of tuning frequency the capacitive component of each resonant circuit is formed by two pairs (5, 7 and 6,8, or 9,11 and 10, 12) of capacitors in series, each series-connected pair effectively forming a varaible capacitive voltage divider to the tap on which the reactive intercoupling means (15) is connected. One capacitor (5, 6, 9 or 10) of each pair is variable, and all these are adjusted at the same rate. The other capacitor (7, 8, 11 or 12) is fixed, and the ratio between the capacitances of the fixed capacitors of each capacitive component are chosen so that the required degree of compensation is obtained. As an alternative the fixed capacitors may be replaced by short circuits and the variable capacitors of each capacitive component may be varied at different rates.
REFERENCES:
patent: 2997672 (1961-08-01), Reinsmith
patent: 3624514 (1971-11-01), Putzer
patent: 3646449 (1972-02-01), Hellbarth et al.
patent: 3903487 (1975-09-01), Maier
patent: 4316108 (1982-02-01), Rogers, Jr.
patent: 4586007 (1986-04-01), Ciszek
patent: 4839617 (1989-06-01), Speake
LaRoche Eugene R.
Lee Benny
Slobod Jack D.
U.S. Philips Corp.
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