| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size and the number of components of a high frequency filter capable of switching a pass band or block band. SOLUTION: In a bandwidth variable filter, first to third capacitors C1 to C3 are serially connected between an input terminal 1 and an output terminal 2; a first inductor L1 and a fourth capacitor C4 are serially connected between contact points of the first and the second capacitors C1 and C2 and the ground; and a first diode D1 is connected between the fourth capacitor C4 and the first inductor L1. A second inductor L2 and a fifth capacitor C5 are serially connected between the second and the third capacitors C2 and C3 and the ground. A third inductor L3 is connected between one ends of the first and the second inductors L1 and L2 and the ground, and an eighth capacitor C8 and a third diode D3 are connected in parallel to a third inductor L3. COPYRIGHT: (C)2008,JPO&INPIT
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