A resonator includes a resonant electrode on a substrate having piezoelectricity. The resonant electrode includes a first comb-shaped electrode including a first busbar electrode and first electrode fingers, and a second comb-shaped electrode including a second busbar electrode and second electrode fingers. The substrate includes first and second overlap regions. The first region includes of pairs of first and second electrode fingers arranged alternately at a first pitch. The second region includes pairs of first and second electrode fingers arranged alternately at a second pitch different from the first pitch. An electrostatic capacitance of the first comb-shaped electrode and the second comb-shaped electrode in the first region is about 0.9 times or more and about 1.1 times or less an electrostatic capacitance of the first comb-shaped electrode and the second comb-shaped electrode in the second region.

A resonator includes a resonant electrode on a substrate having piezoelectricity. The resonant electrode includes a first comb-shaped electrode including a first busbar electrode and first electrode fingers, and a second comb-shaped electrode including a second busbar electrode and second electrode fingers. The substrate includes first and second overlap regions. The first region includes of pairs of first and second electrode fingers arranged alternately at a first pitch. The second region includes pairs of first and second electrode fingers arranged alternately at a second pitch different from the first pitch. An electrostatic capacitance of the first comb-shaped electrode and the second comb-shaped electrode in the first region is about 0.9 times or more and about 1.1 times or less an electrostatic capacitance of the first comb-shaped electrode and the second comb-shaped electrode in the second region.

Two or more ME resonators are connected in series and in parallel generating a high sensitive, energy efficient and broadband miniature antenna and other conductor devices.

Two or more ME resonators are connected in series and in parallel generating a high sensitive, energy efficient and broadband miniature antenna and other conductor devices.

An acoustic wave device includes first and second piezoelectric layers including lithium niobate or lithium tantalate, a pair of first and second electrodes on a first principal surface of the first piezoelectric layer, and a pair of third and fourth electrodes on a first principal surface of the second piezoelectric layer, wherein the first piezoelectric layer and the first and second electrodes define a first acoustic wave resonator, the second piezoelectric layer and the third and fourth electrodes define a second acoustic wave resonator, and an angle between a crystal orientation of the first piezoelectric layer and a direction perpendicular or substantially perpendicular to a lengthwise direction of the pair of the first and second electrodes is different from an angle between a crystal orientation of the second piezoelectric layer and a direction perpendicular or substantially perpendicular to a lengthwise direction of the pair of the third and fourth electrodes.

An acoustic wave device includes first and second piezoelectric layers including lithium niobate or lithium tantalate, a pair of first and second electrodes on a first principal surface of the first piezoelectric layer, and a pair of third and fourth electrodes on a first principal surface of the second piezoelectric layer, wherein the first piezoelectric layer and the first and second electrodes define a first acoustic wave resonator, the second piezoelectric layer and the third and fourth electrodes define a second acoustic wave resonator, and an angle between a crystal orientation of the first piezoelectric layer and a direction perpendicular or substantially perpendicular to a lengthwise direction of the pair of the first and second electrodes is different from an angle between a crystal orientation of the second piezoelectric layer and a direction perpendicular or substantially perpendicular to a lengthwise direction of the pair of the third and fourth electrodes.