Patent ID: 7420438

Claim:
A front end module for processing transmission signals and reception signals in each of a first frequency band and a second frequency band and for processing reception signals in a third frequency band, the front end module comprising: a first separating means connected to an antenna and separating the first to third frequency bands from one another; a second separating means connected to the first separating means, including two acoustic wave elements each of which functions as a filter, and separating the transmission signals and the reception signals in the first frequency band from each other; a third separating means connected to the first separating means, including two acoustic wave elements each of which functions as a filter, and separating the transmission signals and the reception signals in the second frequency band from each other; and a single multilayer substrate for integrating the first to third separating means, wherein: the first separating means is made up of conductor layers located inside or on a surface of the multilayer substrate; the first separating means includes a filter; the second or third separating means includes a delay line that is provided between the first separating means and the acoustic wave elements and that adjusts an impedance; the two acoustic wave elements that the second separating means includes and the two acoustic wave elements that the third separating means includes are mounted on a top surface of the multilayer substrate; and the multilayer substrate includes as the conductor layers located inside the substrate: a ground layer; a conductor layer disposed between the ground layer and the top surface of the multilayer substrate and making up the delay line; and a conductor layer disposed between the ground layer and a bottom surface of the multilayer substrate and making up the filter that the first separating means includes, the front end module further comprising a terminal disposed on the bottom surface of the multilayer substrate and connected to the conductor layer making up the filter that the first separating means includes.