Patent ID: 8077656

Claim:
A front-end module for use with at least three radio frequency bands, the front-end module comprising: at least five signal paths; an antenna switch to electrically connect an antenna to one of the signal paths; wherein at least one of the signal paths comprises subpaths, a frequency separating network interfacing the at least one signal path to the subpaths; wherein the subpaths are for use in passing different radio frequency bands, the different radio frequency bands having frequency ranges that do not overlap; wherein the frequency separating network comprises a high-pass filter in a first subpath and a low-pass filter in a second subpath; wherein a center frequency of a first radio frequency band is lower, by approximately one octave or more, than a center frequency of a second radio frequency band; wherein the first subpath is a transmit path of the second radio frequency band; and wherein the second subpath is a transmit path of the first radio frequency band.