Patent ID: 7253702
Filing Date: 2007-08-07
Classification: H03H,H04B,H05K,Y02P

Abstract:
1. A high-frequency switch module, comprising: a laminate comprising a plurality of dielectric layers each having an electrode pattern, said high-frequency switch module comprising a high-frequency switch circuit for switching a transmitting circuit and a receiving circuit of transmitting/receiving systems; and a filter circuit connected to a receiving side of said high-frequency switch circuit, wherein said filter circuit is a surface acoustic wave filter, and a phase shift circuit including at least one selected from the group consisting of an inductor and a capacitor is arranged between said switch circuit and said surface acoustic wave filter, thereby obtaining high isolation between the transmitting circuit and the receiving circuit at a high transmitting frequency, said surface acoustic wave filter and switching elements of said high frequency switch are mounted on said laminate and connected to the electrode patterns formed therewithin through via-holes, as well as a lower surface of a lowermost layer of said laminate having terminal electrodes and a ground electrode as a plurality of external terminals to be connected to said electrode patterns through via-holes, and a part of said ground electrode is formed on the lower surface of the lowermost layer of said laminate in an isolated state from other electrodes.