High-frequency device, high-frequency module and communications device comprising them

A high-frequency module comprising a switch circuit module part comprising at least one switch circuit for switching connection to an antenna side circuit and a predetermined transmitting system circuit or receiving system circuit and a high-frequency amplifying circuit connected to said switch circuit module part so as to be used between a plurality of transmitting/receiving systems having different passbands and an antenna,

• wherein a switching element of said switch circuit module part and a semiconductor element used for said high-frequency amplifying circuit are mounted onto a laminate having electrode patterns formed on dielectric layers constituting said laminate, at least part of said switch circuit module part and/or said high-frequency amplifying circuit being constituted by said electrode patterns formed in said laminate,
• wherein a phase relation between said switch circuit module part and said high-frequency amplifying circuit is in a state corresponding to a conjugate matching in a fundamental frequency band, while it is in a state corresponding to a nonconjugate matching in n-th frequency bands, wherein n is an Integer of 2 or more, and
• wherein a phase adjustment is carried out so that a phase of an impedance Z2 in said n-th frequency bands of said switch circuit when viewed from a connection reference plane between said switch circuit and said high-frequency amplifying circuit is within θ0+120°, wherein θ0 (θ1±180°:
• a position symmetrical with respect to a center on a Smith chart) is a phase opposite to a phase θ1 by 180°, and θ1 (−θ) is conjugate to a phase θ of an impedance Z1 in said n-th frequency bands of said high-frequency amplifier when viewed from said connection reference plane.