Patent ID: 7289008

Claim:
A high-frequency module comprising: a transmitting filter and a receiving filter connected with an antenna terminal directly or via a multiplexer circuit; a matching circuit inserted in an input side of the receiving filter; and a high-frequency power amplifier circuit connected with the transmitting filter for amplifying a transmission signal in a predetermined transmission pass band, the filters, the matching circuit and the high-frequency power amplifier circuit provided on a multilayered substrate, wherein the transmitting filter and the receiving filter is a surface acoustic wave (hereinafter, referred to as “SAW”) filter, wherein the transmitting SAW filter and the receiving SAW filter constitute a single bare chip formed on a single piezoelectric substrate, wherein a main surface of the bare chip is formed with IDT electrodes, input/output electrodes of the IDT electrodes, and a ground electrode surrounding the IDT electrodes, wherein the ground electrode and the input/output electrodes are bonded with electrodes formed on the surface of the multilayered substrate in a face-to-face relation, wherein a sealed space is formed at a SAW propagation portion of the IDT electrodes.