Patent ID: 6876273
Filing Date: 2005-04-05
Classification: H03H,H04B,H05K

Abstract:
1. A front end module comprising: an antenna switch for selectively connecting an antenna to a transmitter circuit or a receiver circuit; a low pass filter for removing harmonics from a transmit signal output from a transmitter circuit; an unbalanced-output surface acoustic wave filter for filtering a signal received via said antenna switch of said antenna; and a balun for converting an unbalanced signal that has passed through said surface acoustic wave filter, wherein said antenna switch, said low pass filter, said surface acoustic wave filter and said balun are arranged as a module integrated by a multilayer substrate and components incorporated in or mounted on said multilayer substrate and wherein said antenna switch, said surface acoustic wave, and said balun are connected in this order along a flow of received signal, and said surface acoustic wave and said balun are directly connected.