| 摘要 |
PROBLEM TO BE SOLVED: To provide a frequency multiplexer using an available resonance circuit to provide permissible performance. SOLUTION: This invention discloses the frequency multiplexer (200). The frequency multiplexer (200) includes: a lumped element transmission line (220) including a plurality of inductors (L) and capacitors (C); and a band pass filter (140) coupled to a node of the frequency multiplexer (200). The band pass filter (140) includes a branch port (148) coupled to the lumped element transmission line (220) for a pass band of the band pass filter (140) and shows a capacitive impedance for the block band of the band pass filter (140). The band pass filter (140) may include a series resonance circuit (142) and a parallel resonance circuit (144). An additional series resonance circuit (240) may be coupled to the lumped component transmission line (220). COPYRIGHT: (C)2004,JPO
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