| 摘要 |
PURPOSE:To obtain a maximum attenuation in two traps by connecting a side of an LC tank circuit of a bridged T trap circuit opposite to the connecting point of a CR delta connection to ground via an LC series circuit. CONSTITUTION:A resistor 22 is used in common to reduce the insertion loss of the trap circuit and capacitors 23, 24, 25, 26 for the CR delta connection, resonance capacitors 27, 28, 29, 30 and variable coils 31, 32, 33, 34 are connected respectively in two trap circuits. Thus, in varying the inductance of the variable coils 31, 32, a maximum attenuation is obtained at a desired frequency f3 and in varying the variable coils 33, 34, a maximum attenuation is obtained at another desired frequency f4.
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