Bandpass filter circuit arrangement

Details Bandpass filter circuit arrangement Bandpass filter circuit arrangement

1988-11-22

1989-06-13

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333167, 333175, H03H 701

Patent

active

048396176

ABSTRACT:
A bandpass filter comprises a reactively intercoupled pair of parallel-resonant circuits (1, 2) to one of which a pair of signal input terminals (15, 16) are connected and to the other of which a pair of output terminals (17, 18) are connected. Tuning of the filter is accomplished by varying the capacitive component of each circuit by means of a tuning voltage applied to a further input (19). 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 comprises at least three capacitors (5, 6, 7 and 8, 9, 10) in series, each set of three capacitors effectively forming a variable capacitive voltage divider. The two junction points of the three capacitors of each set are each connected to the corresponding junction point in the other set by means of a respective bidirectional reactive coupling (13 and 14 respectively).

REFERENCES:
patent: 3624514 (1971-11-01), Putzer
patent: 3646449 (1972-02-01), Hellbarth et al.
patent: 4316108 (1982-02-01), Rogers, Jr.

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