摘要:
A duplexer device of this invention includes two surface acoustic wave filters having different band center frequencies and a phase matching circuit for matching phases of the two surface acoustic wave filters. The phase matching circuit is composed of one or more. line patterns, and at least one of the line patterns is formed as divided among a plurality of internal layers of a multi-layer package, and at least the line patterns formed on the internal layers adjacent to each other have pattern shapes different from each other. According to the invention, a duplexer device having a small size and stable filter characteristics can be provided.
摘要:
This invention is a duplexer device comprising two surface acoustic wave filters having band center frequencies different from each other and a line pattern for matching phases of the two surface acoustic Wave filters, wherein provided are: a wire bonding pad layer having a plurality of pads including. pads. for connecting the line pattern with terminals on the surface acoustic wave filters and pads for connecting a common terminal connected to. an external antenna with the line pattern; and a first pad connecting one of the surface acoustic wave filters and a first end of the line pattern and a second pad connecting the common terminal and a second end of the line pattern being arranged at positions that are the most distant from each other inside the wire bonding pad layer.