摘要:
In a bridge T type trap circuit having CR delta :onnection circuit and a varible LC tank circuit, the CR delta connection circuit is connected to the LC ank circuit via a variable inductor (19; 31, 33; 40). In one embodiment, a capacitor (18) is coupled with he variable inductor (19; 31, 33) to form another LC ank 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 nductor (40) are ajdusted so that absolute values of eal and imaginary parts thereof have given relationship. A resistor (22)of the CR delta connection circuit s used in common in a double-trap structure having wo CR delta conection circuits and two series cir- :uits each having two tank circuits.
摘要:
In a bridge T type trap circuit having CR delta :onnection circuit and a varible LC tank circuit, the CR delta connection circuit is connected to the LC ank circuit via a variable inductor (19; 31, 33; 40). In one embodiment, a capacitor (18) is coupled with he variable inductor (19; 31, 33) to form another LC ank 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 nductor (40) are ajdusted so that absolute values of eal and imaginary parts thereof have given relationship. A resistor (22)of the CR delta connection circuit s used in common in a double-trap structure having wo CR delta conection circuits and two series cir- :uits each having two tank circuits.
摘要:
A band-pass filter comprising a shielded housing (13) having two chambers in which two quarter-wave resonators (9a, 9b) are disposed respectively for coupling with input energy and for delivering output energy. Also mounted in these chambers are two parallel-circuit resonators (9c, 9d) for coupling with the quarter-wave resonators respectively. Each of the resonators (9a, 9b, 9c, 9d) comprises a multilayered coil structure on a finned bobbin (11a, 11b, 11c, 11d) juxtaposed on a common insulative substrate (12) so that its coil portions (11a', 11b', 11c', 11d') are separately wound on adjacent fins (10) of the bobbin. Each of the quarter-wave resonators (9a, 9b) has one end being short-circuited and the other end being open-circuited. Each of the parallel-circuit resonators includes a capacitor (21a, 21b) to form a parallel resonance circuit and has one end coupled to one end of the other parallel-circuit resonator at a point outside of the housing. Two auxiliary coils (22c, 22d) are inductively coupled respectively with the parallel-circuit resonators, one end of each auxiliary coil being connected to the housing and the other ends being coupled together to an external circuit.