DIPLEXER, HIGH-FREQUENCY SWITCH USING THE SAME AND ANTENNA DUPLEXER

摘要

PURPOSE: A diplexer, a high-frequency switch using the same and an antenna duplexer are provided to widen the passband of a high-pass filter by providing two attenuation poles in a low-pass filter. CONSTITUTION: A diplexer passes signals of a high frequency band without being attenuated over a wide frequency band, and a high-frequency switch uses the diplexer. The diplexer includes a low-pass filter(82) having a parallel resonant circuit formed by the first capacitor (C1) and the first inductor (L1) and a serial resonant circuit formed by the second capacitor(C2) and the second inductor(L2). Two attenuation poles are provided in the low-pass filter(82). The passband of a high-pass filter(83) is widened.