Patent ID: 6998710

Claim:
A high-frequency device comprising: a semiconductor substrate; a high-frequency circuit layer formed at a surface of said semiconductor substrate and including a circuit element and a multilayer wiring layer; a plurality of electrically conductive pads formed on said high-frequency circuit layer and connected to an input and an output of high-frequency circuit and to a power source; a plurality of rewiring layers formed on said high-frequency circuit layer via a first electrically insulating layer and respectively connected to said plurality of electrically conductive pads; an electrically insulating sealing layer which is formed on said first electrically insulating layer and said rewiring layer and has a thickness larger than that of said multilayer wiring layer; a plurality of mounting connection terminals which are provided on said electrically insulating sealing layer and correspond to said plurality of electrically conductive pads; and a plurality of electrically conductive posts provided inside said electrically insulating sealing layer and between said rewiring layer and mounting connection terminals, wherein the high-frequency circuit of said high-frequency circuit layer comprises an input amplifier for amplifying a high-frequency reception signal inputted from the electrically conductive post corresponding to said input and a power output amplifier for amplifying a high-frequency transmission signal and outputting the same from the electrically conductive post corresponding to said output; and wherein a first electrically conductive post corresponding to said power source has a first diameter; a second electrically conductive post corresponding to the input of said input amplifier has a second diameter which is less than said first diameter; and a third electrically conductive post corresponding to the output of said power output amplifier has a third diameter which is larger than said second diameter.