| 摘要 |
<p>Provided is a demultiplexer in which it is possible to form a sharp stopband in a passband of a highpass filter, with minimal increase in the number of components and the size of the filter. A demultiplexer (1), in which one end of a lowpass filter (2) and a one end of a highpass filter (3) are connected to an antenna terminal (4), and an elastic-wave trap filter (6) is connected to the highpass filter (3). The elastic-wave trap filter forms in a second passband, which is a passband of the highpass filter (3), a stopband having a narrower frequency width than the second passband.</p> |
