Frequency separator for use in dual-band mobile phone terminals

摘要

A frequency separator used for a dual-band mobile phone terminal using two bands of f1 and f2 has a first notch circuit comprising a capacitor component (C1) and an inductance component (L1) passing a signal of the band f1 and a second notch circuit comprising a capacitor component (C2) and an inductance component (L2) passing a signal of the band f2. The first notch circuit is interposed between an antenna (T1) of the dual-band mobile phone and a communication circuit (T2) handling the signal of the band f1, the second notch circuit is interposed between an antenna (T1) of the dual-band mobile phone and a communication circuit (T3) handling the signal of the band f2. An end portion is formed by interconnecting the first notch and notch circuits is connected to the antenna side of the dual-band mobile phone for subjecting the signal input to branching to each of the communication circuit sides handling the respective signals of bands f1 and f2, thereby making it possible to select one band of the two bands of f1 and f2 and talk over the dual-band mobile phone.