Composite high frequency component and mobile communication apparatus incorporating the same

A composite high frequency component comprising:

• a diplexer which accepts transmitted signals from a plurality of signal paths at a time of transmission, and delivers received signals to the plurality of signal paths at a time of reception;
• a plurality of high frequency switches dividing the plurality of signal paths, respectively, into transmission sections and reception sections;
• a high frequency filter connected in at least one of the signal paths;
• a surface acoustic wave filter connected to a respective one of the reception sections at the rear of the corresponding high frequency switch;
• and
• a multi-layer substrate comprising a plurality of laminated sheet layers in which the diplexer, the high frequency switches, the high frequency filter, and the surface acoustic wave filter are interconnected, the multi-layer substrate having a top surface and a bottom surface;
• wherein the multi-layer substrate includes a ground electrode formed on one of said sheet layers adjacent to the bottom surface of the multi-layer substrate;
• and
• the surface acoustic wave filters are mounted on the top surface of the multi-layer substrate.