Abstract:
The construction comprises a substrate (1), a barrier layer (2), a resistance layer (3), a dielectric layer (4) with a dielectric constant (K) (7), an electrode (5), a second dielectric layer (6) and a second electrode (7). This sandwich assembly is enclosed by terminals (8) to form a suppression filter. A track (9) passes through the dielectric layers, connecting the resistance layer and the top dielectric layer
Abstract:
The invention relates to an array of ultrasound transducers which each comprise a membrane that is comprised of diamond or diamond-like carbon, a barrier structure, a piezoelectric layer, a first electrode and a second electrode. The barrier structure ensures strong adhesion of the piezoelectric layer to the barrier structure and thus to the device and that the piezoelectric layer only comprises a single phase. In addition, the barrier structure protects the membrane against oxidation/decomposition during the manufacturing process of piezoelectric layer. The invention further relates to an ultrasound transducer.
Abstract:
The invention relates to an array of ultrasound transducers which each comprise a membrane that is comprised of diamond or diamond-like carbon, a barrier structure, a piezoelectric layer, a first electrode and a second electrode. The barrier structure ensures strong adhesion of the piezoelectric layer to the barrier structure and thus to the device and that the piezoelectric layer only comprises a single phase. In addition, the barrier structure protects the membrane against oxidation/decomposition during the manufacturing process of piezoelectric layer. The invention further relates to an ultrasound transducer.
Abstract:
A bulk acoustic wave resonator comprising a substrate (5), a Bragg reflector (4), a top (1) and a bottom (3) electrode and a piezoelectric layer (2) with means for suppression of the pass-band ripples in a bulk acoustic wave filter. The means for absorbing or scattering the spurious modes are a roughened rear side of the substrate (6), an absorbing layer (5) disposed on the rear side of the substrate (6) and/or an absorbing layer (5) disposed on the front side of the substrate.
Abstract:
In the method of preparation of the Pb-Zr-Ti-containing solutions the lead is added to the Zr- and Ti-containing solution in powdery form. This has the advantage that it takes less time, and that nevertheless a stable solution is obtained. Preferably use is made of Zr- and Ti-butoxides and of lead acetate tri-hydrate. A very suitable solvent is 1-methoxy-2-propanol. The solution can be used for the manufacture of layers on a substrate with a high dielectric constant.