Patent ID: 11909374
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An acoustic resonator device comprising:
a substrate;
a single-crystal piezoelectric plate attached directly or by one or more intermediate layers to the substrate and having a portion that forms a diaphragm spanning a cavity; and
a first conductor level at a surface of the piezoelectric plate, the first conductor level including:
first and second busbars;
a first set of elongated fingers extending from the first bus bar,
a second set of elongated fingers extending from the second bus bar, the second set of elongated fingers interleaved with the first set of elongated fingers,

wherein the first and second busbars are not on the diaphragm, and
wherein the first and second sets of elongated fingers extend from the respective busbars onto the diaphragm, and
wherein one of:
a first distance and a second distance are as small as allowed by expected manufacturing tolerances, or
nominal values of the first distance and the second distance are equal to a worst-case expected misregistration between the cavity and a photomask used to pattern the first conductor level.