Patent ID: 7688159
Filing Date: 2010-03-30
Classification: H01F,H03H

Abstract:
1. A SAW duplexer comprising: a first SAW filter having a ladder-shaped circuit configuration including at least one serial arm resonator and at least one parallel arm resonator, and having a passband with a relatively low frequency; a second SAW filter having a ladder-shaped circuit configuration including at least one serial arm resonator and at least one parallel arm resonator, and having a passband with a relatively high frequency; and a bridging inductor connected in parallel to the at least one serial arm resonator in the second SAW filter; wherein the first SAW filter and the second SAW filter are defined by SAW filter chips; the SAW duplexer further includes a multilayer package substrate on which the SAW filter chips are mounted; and the bridging inductor includes: a coil return wire portion including at least the first and third via-hole conductors is disposed inside a coiled portion including the first wire, the second wire, and the third wire.