| 摘要 |
Provided is a filter device that allows a control circuit to be removed and enables reductions in cost, size, and power consumption. A filter device (9) includes a band pass filter (3) connected between a first signal terminal (5) and a second signal terminal (6) and an LC circuit (8) connected in parallel with the band pass filter (3). The LC circuit (8) is configured to have anti-resonant characteristics that make the LC circuit (8) be open at a pass band of the band pass filter (3), and configured to make attenuation in a specified frequency band outside of the pass band of the band pass filter (3) higher than in a case in which the LC circuit (8) is not connected, as a result of the LC circuit (8) being connected. |
