| 摘要 |
<p>There is provided a tapered elastic wave filter higher (11) in impedance than a conventional filter where one input-side IDT electrode and one output-side IDT electrode are disposed. Filter parts which are the same in the structure of an input-side IDT electrode (12) and in the structure of an output-side IDT electrode (13) are disposed, and when the first filter part (31) is disposed on a lower side and the second filter part (32) is disposed on an upper side of the first filter part so that the input-side IDT electrodes (12) are connected and the output-side IDT electrodes (13) are connected, in cascade (in series) between a signal port (21) and a ground port (23), an upper busbar (10) in each of the IDT electrodes of the first filter part (31) and a lower busbar (10) in each of the IDT electrodes of the second filter part (32) are electrically connected to each other.</p> |
