BYPASS FILTER, MULTI−BAND ANTENNA SWITCH CIRCUIT, AND LAYERED MODULE COMPOSITE PART AND COMMUNICATION DEVICE USING THEM

摘要

A multi−band antenna switch circuit including a diplexer connected to an antenna terminal for demultiplexing signals of different passing bands,a first and a second switch circuit for switching a high frequency signal and a low frequency signal demultiplexed by the diplexer to a plurality of transmission/reception terminals,a first and a second low pass filter connected to a transmission path between the diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal,and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit.The multi−band antenna switch circuit includes a high pass filter having an input terminal and an output terminal and provided at least between the diplexer and the antenna terminal and including a first inductor connected between the input terminal and the ground,a first capacitor connected between the input terminal and the output terminal,a second inductor connected to the output terminal,and a second capacitor connected between the second inductor and the ground.