Patent ID: 7262676

Claim:
An electroacoustic component, comprising: a first substrate; a layer system disposed at said first substrate to define a first interface therebetween, said layer system having: a piezo-electric layer; a first metal layer disposed on said piezo-electric layer, said first metal layer having electrode structures and contact surfaces, said electrode structures being disposed next to one another and forming a functional unit; a region of said piezo-electric layer disposed adjacent said functional unit forming an active region in which a guided bulk acoustic wave of a wavelength λ can propagate; and a dielectric planarizing layer; and a second substrate; said piezo-electric layer being disposed between said first substrate and said first metal layer; said first metal layer being disposed between said piezo-electric layer and said dielectric planarizing layer; and said dielectric planarizing layer being disposed between said first metal layer and said second substrate; said layer system and said second substrate defining a second interface therebetween; said piezo-electric layer and said first and second substrates being formed to have a smaller propagation velocity of said guided bulk acoustic wave in said piezo-electric layer than a propagation velocity of said guided bulk acoustic wave in said first and second substrates; and said layer system and said first and second interfaces being devoid of cavities; said first substrate has a first side; said second substrate has a second side; external contacts are disposed on at least one of said first side and said second side; through-contacts electrically conductively connect said contact surfaces with said external contacts through at least one of said first and second substrates; at least two of said through-contacts in a respective one of said first and second substrates: extend in a V-shaped cross-section perpendicular to a respective plane of one of said first and second substrates; cut through corresponding ones of said contact surfaces; and end above an interface of a respective other one of said first and second substrates facing said respective one of said first and second substrates; and said V-shaped through-contacts are trench-shaped and extend along a length thereof.