Patent ID: 7948333

Claim:
A component working with guided acoustic waves, the component comprising: a layer system configured to guide waves in a lateral plane, the layer system comprising: a piezoelectric layer; electrodes on the piezoelectric layer for exciting the waves, a dielectric layer with an acoustic impedance; and an adjustment layer with an acoustic impedance, wherein: a ratio of the acoustic impedance of the adjustment layer to the acoustic impedance of the dielectric layer is greater than 1.5; an acoustic impedance of the adjustment layer is greater than the acoustic impedance of each of the other layers included in the layer system, the adjustment layer is configured to substantially influence an acoustic reflection of the waves and the adjustment layer is spaced apart from the piezoelectric layer in at least one spacing area; the electrodes comprise a first electrode layer with an acoustic impedance between the piezoelectric layer and the adjustment layer, wherein a ratio of the acoustic impedance of the first electrode layer to the acoustic impedance of the dielectric layer is between 0.5 and 2; and a height of the first electrode layer is configured such that the component has a temperature coefficient of a maximum of 25 ppb/K.