| 摘要 |
PURPOSE: A double-band SAW(Surface Acoustic Wave) filter is provided to miniaturize a size of an SAW filter by connecting each input/output port of a plurality of band pass filters with one another in a row. CONSTITUTION: A plurality of band pass filters(11,12) have two input ports and two output ports, operate in a specific central frequency, and filter an input signal. A series connection input port(21) connects each input port of the plurality of band pass filter(11,12) with one another in parallel. A parallel connection output port(22) connects each output port of the plurality of band pass filter(11,12) with one another in a row. A plurality of impedance matching circuit units(23a,23b) break an interference inter band pass filter(11,12). |
