| 摘要 |
PROBLEM TO BE SOLVED: To provide a high frequency switch module for multi-band having an excellent electric characteristics. SOLUTION: The switch module is constituted of a branching filter circuit for dividing plural transmission/reception systems of different pass bands to respective transmission/reception systems and switch circuits for switching each transmission/reception system to a transmission system and a reception system. The branching filter circuit comprises a low-pass filter circuit consisting of a distributed constant line, high-pass filter circuit comprising a capacitor, first series resonant circuit and second series resonant circuit. The low-pass filter is connected between a common terminal of the plural transmission/ reception systems and the switch circuit, at the latter step of the low-pass filter, the first resonant circuit is arranged between a terminal of the low-pass filter and a grounding point, the high pass-filter is connected between the common terminal and another switch circuit, at the latter step of the high-pass filter, the second resonant circuit is arranged between a terminal of the high- pass filter and the grounding point.
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