| 摘要 |
An elastic wave filter device (1) in which elastic wave filters (4 and 5) and parallel resonators (3A and 3B) are provided on a piezoelectric substrate (10) includes ground ports (GND1, GND2, and GND3). The elastic wave filters (4 and 5) include input-side resonators (4A, 4C, 4E, 5A, 5C, and 5E) and output-side resonators (4B, 4D, 5B, and 5D). The input-side resonators (4A, 4C, 4E, 5A, 5C, and 5E) are connected between a reception input port (IN) and the ground port (GND1). The output-side resonators (4B, 4D, 5B, and 5D) are connected between reception output ports (OUT1 and OUT2) and the ground port (GND1). The parallel resonators (3A and 3B) are connected in parallel to output lines and are connected to the ground ports (GND2 and 3). |
