Patent ID: 11962289
Assignee: TAIYO YUDEN CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The filter according to claim 1, wherein the filter circuit includes:
a first element having a first end connected to a ground, the first element being selected from a group consisting of an acoustic wave resonator, an inductor, and a capacitor,
a second element connected between the first signal terminal and the second signal terminal, the second element being selected from an inductor and a capacitor when the first element is an acoustic wave resonator, the second element being an acoustic wave resonator when the first element is an inductor or a capacitor,
a third element that is connected in parallel to the second element between the first signal terminal and the second signal terminal and is selected from an inductor and a capacitor, a type of the third element being different from a type of the first element when an inductor or a capacitor is selected as the first element, the type of the third element being different from a type of the second element when an inductor or a capacitor is selected as the second element, and
a fourth element that is connected in series with the third element and is connected in parallel to the second element between the first signal terminal and the second signal terminal, a second end of the first element being connected between the fourth element and the third element, a type of the fourth element being identical to the type of the third element.