Antenna duplexer, and rf module and communication apparatus using the same

Abstract

One of plurality of transmission terminals connected to a transmission filter and a receiving terminal connected to a receiving filter is a balanced type terminal, and another is an unbalanced type terminal. The transmission filter and the receiving filter includes surface acoustic wave resonators or film bulk acoustic resonators. The balanced type terminal is connected to a longitudinal mode coupled surface acoustic wave filter.

1 - 9 . (canceled) 
     
     
         10 . An antenna duplexer, comprising:
 an antenna terminal;   a transmission terminal, being an unbalanced-type terminal;   a receiving terminal, being a balanced-type terminal;   a transmission filter, connected between the antenna terminal and the transmission terminal, and only including a ladder-type filter that adopts a film bulk acoustic resonator; and   a receiving filter, connected between the antenna terminal and the receiving terminal, and including both a ladder-type filter that adopts a film bulk acoustic resonator serially connected to the antenna terminal and a longitudinal-mode-coupled surface acoustic wave filter serially connected to the antenna terminal and connected to the balanced-type terminal, transmission filter and the receiving filter having different thicknesses, being provided on a single mounting substrate and molded by a resin an upper surface of which is substantially flat.   
     
     
         11 . The antenna duplexer according to  claim 10 , wherein the resonator in the receiving filter closest to the antenna terminal is a film bulk acoustic resonator. 
     
     
         12 . The antenna duplexer according to  claim 10 , further comprising a phase shifter connected between the receiving filter and the antenna terminal, and serially connected to the at least one film bulk acoustic resonator serially connected to the antenna terminal. 
     
     
         13 . The antenna duplexer according to  claim 12 , wherein the phase shifter and the at least one film bulk acoustic resonator serially connected to the phase shifter are formed on a single substrate. 
     
     
         14 . The antenna duplexer according to  claim 12 , wherein the phase shifter is built in the mounting substrate. 
     
     
         15 . The antenna duplexer according to  claim 12 , wherein the phase shifter includes a strip line or a lumped constant device.