Patent ID: 7996984
Filing Date: 2011-08-16
Classification: H03H,Y10T

Abstract:
1. A manufacturing method of a duplexer for a mobile communication device comprising the steps of: a) forming a plurality of recesses on a substrate; b) forming an insulation layer on the substrate; c) forming a plurality of filling-up layers for filling the recesses; d) forming a membrane on the filling-up layers and the substrate; e) forming a transmitting band pass filter including at least two film bulk acoustic resonators (FBARs) and at least one first inductor electrically connected to each other on an upper portion of the membrane; f) forming a receiving band pass filter including at least two other FBARs and at least one second inductor electrically connected to each other on other upper portion of the membrane; g) forming a circuit including at least one third inductor and a capacitor electrically connected with the transmitting and receiving band pass filters, the circuit being between the transmitting and receiving band pass filters on the membrane; and h) removing the filling-up layers.