Epcos Ag

Qualcomm Incorporated

Wolfgang Sauer

Markus Mayer

Edgar Schmidhammer

Christoph Eggs

Michael Jakob

Karl-Christian Wagner

Werner Ruile

Anton Leidl

Markus Hauser

Ulrike Rösler

Ingo Bleyl

Thomas Ebner

Stefan Berek

Thomas Bauer

Andreas Bergmann

Andreas Link

Habbo Heinze

Ulrich Knauer

Ansgar Schäufele

Stefan Seitz

Thomas Kauschke

Franz Kubat

The aim according to the invention is to suppress a disturbing SH mode in a ladder-type filter. This aim is achieved in that the resonance frequency of the series resonator responsible therefor is moved and, at the same time, the pole zero distance of the series resonator is reduced by parallel connection with a capacitor. The antiresonance of the series resonator and therefore also the passband thus remain unchanged.

Saw filter having suppressed shear mode

An electroacoustic component is specified in which the disturbing contributions of undesired wave modes are reduced. For this purpose, a component includes a piezo layer, an electrode layer and a separating layer. A main mode and a secondary mode are capable of propagation in the component. The separating layer has an opposite thickness dependence for the frequencies of the main mode and of the secondary mode.

Electroacoustic component and method for the production thereof

An electroacoustic transducer has reduced loss due to acoustic waves emitted in the transverse direction. For this purpose, a transducer comprises a central excitation area, inner edge areas flanking the central excitation area, outer edge areas flanking the inner edge areas, and areas of the busbar flanking the outer edge areas. The longitudinal speed of the areas can be set so that the excitation profile of a piston mode is obtained.

Electroacoustic transducer having reduced losses due to transverse emission and improved performance due to suppression of transverse modes

A component is designed to work with acoustic waves. Embodiments have an improved temperature gradient of the frequency range and have increased performance strength. To this end, the component includes a stack of layers having a lower bonding layer, an electrode layer, an upper bonding layer, a compensation layer, and a trimming layer.

Component working with acoustic waves having reduced temperature coefficient of frequencies and method for producing same

A component () is proposed wherein the suspension of the component () is effected in a stress-reduced manner. The component () can rest on a membrane () or be held by a spring element (). The membrane () or the spring element () is situated above a depression () or an opening () partially spanned by the membrane (). Preferably, the membrane () has a modulus of elasticity that is less than or equal to the modulus of elasticity of the component () or of the substrate (). The component () can be covered with metal electrodes () wholly or partially over the area on two sides.

Component having stress-reduced mounting

A capacitor includes a multi layer structure on a ceramic or crystalline substrate. The multilayer structure includes a lower electrode, an upper electrode, and a dielectric that is tunable by a voltage applied to the electrodes. The multilayer structure is configured such that resonant oscillation modes of bulk acoustic waves can be propagated in the multilayer structure and such that the resonant frequencies of the oscillation modes are outside a first band range of between 810 and 1000 MHz, second band range of between 1700 and 2205 MHz and third band range of between 2400 and 2483.5 MHz.

Adjustable capacitor and circuit provided therewith

A resonator operating with bulk acoustic waves includes a resonator stack. The resonator stack includes a resonator area configured to allow propagation of an acoustic main mode and an acoustic secondary mode. The resonator stack also includes an acoustic mirror that includes a first partial mirror for locking in the acoustic main mode in the resonator area and a second partial mirror for locking in the secondary mode in a resonator space.

Resonator functioning with acoustic volume waves

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Taufkirchen, Germany

Wolfgang Sauer