| 摘要 |
Disclosed is an elastic wave filter device (1) comprising a piezoelectric substrate (10) and elastic wave filters (4, 5) and parallel resonators (3A, 3B) provided on the piezoelectric substrate (10). The elastic wave filter device (1) comprises ground ports (GND1, GND2, GND3). The elastic wave filters (4, 5) comprise input-side resonators (4A, 4C, 4E, 5A, 5C, 5E) and output-side resonators (4B, 4D, 5B, 5D). The input-side resonators (4A, 4C, 4E, 5A, 5C, 5E) are connected between a receiving input port (IN) and a ground port (GND1). The output-side resonators (4B, 4D, 5B, 5D) are connected between receiving output ports (OUT1, OUT2) and a ground port (GND1). The parallel resonators (3A, 3B) are connected parallel to an output line and, at the same time, are connected respectively to the ground ports (GND2, GND3). |
