Trap circuit with two variable inductors

Details Trap circuit with two variable inductors Trap circuit with two variable inductors

1986-04-17

1989-01-03

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333170, H03H 700

Patent

active

047959908

ABSTRACT:
In a bridge T type trap circuit having CR delta connection circuit and a variable LC tank circuit, the CR delta connection circuit is connected to the LC tank circuit via a variable inductor (19; 31, 33; 40). In one embodiment, a capacitor (18) is coupled with the variable inductor (19; 31, 33) to form another LC tank circuit. In another embodiment, a variable inductor (39) used in the first-mentioned LC tank circuit has a tap which is grounded. Impedance values of the first-mentioned LC tank circuit and the variable inductor (40) are adjusted so that absolute values of real and imaginary parts thereof have a given relationship. A resistor (22) of the CR delta connection circuit is used in common in a double-trap structure having two CR delta connection circuits and two series circuits each having two LC tank circuits.

REFERENCES:
patent: 3024421 (1962-03-01), Clark
patent: 3562411 (1971-02-01), Poppa
patent: 3562417 (1971-02-01), Poppa
patent: 3947629 (1976-03-01), Tanaka et al.
patent: 4263619 (1981-04-01), Theriault
patent: 4272743 (1981-06-01), Evans
patent: 4376953 (1983-03-01), Naimpally

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