Patent ID: 11949405
Assignee: WISOL CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A double mode SAW (DMS) filter comprising:
a plurality of interdigital transducers (IDTs), each having a plurality of Type 1 electrode fingers and a plurality of Type 2 electrode fingers formed on a piezoelectric substrate,
wherein in each of the plurality of IDTs, one Type 2 electrode finger among the plurality of Type 2 electrode fingers is disposed between two adjacent Type 1 electrode fingers among the plurality of Type 1 electrode fingers, and
wherein in a first IDT and a second IDT included in the plurality of IDTs to be adjacent to each other, one Type 1 electrode finger of the second IDT is disposed between two Type 1 electrode fingers of the first IDT to control capacitances between input and output terminals of the DMS filter,
wherein the capacitances formed between the input and output terminals are controlled by increasing or decreasing a number of pairs of the Type 1 electrode fingers each pair being composed of one Type 1 electrode finger of the first IDT and one Type 1 electrode finger of the second IDT, with a predetermined capacitance generated between each pair.