Epcos Ag

Rf360 Singapore Pte. Ltd.

Qualcomm Incorporated

Snaptrack Incorporated

Thomas Ebner

Markus Mayer

Werner Ruile

Ulrike Rösler

Edgar Schmidhammer

Markus Hauser

Christoph Eggs

Ingo Bleyl

Wolfgang Sauer

Manuel Sabbagh

Michael Jakob

Stefan Ammann

Philipp Geselbracht

Karl-Christian Wagner

Stefan Berek

Andreas Bergmann

Gholamreza Dadgar Javid

Jiman Yoon

Aspects of the disclosure relate to an electroacoustic device that includes a piezoelectric material and an electrode structure that includes a first busbar and a second busbar along with electrode fingers arranged in an interdigitated manner and including a first plurality of fingers connected to the first busbar and a second plurality of fingers connected to the second busbar. The electrode structure further includes a first conductive structure disposed between each of the first plurality of fingers and disposed between the first busbar and the second plurality of fingers. The electrode structure further includes a second conductive structure disposed between each of the second plurality of fingers and disposed between the second busbar and the first plurality of fingers. The first conductive structure and the second conductive structure each have a height that is less than a height of the second plurality of fingers.

Surface acoustic wave electroacoustic device for reduced transversal modes

Aspects of the disclosure relate to an electroacoustic device that includes a piezoelectric material and an electrode structure. The electrode structure includes a first busbar and a second busbar. The electrode structure further includes a first conductive structure connected to the first busbar and a second conductive structure connected to the second busbar. The first conductive structure and the second conductive structure is disposed between the first busbar and the second busbar. The first conductive structure and the second conductive structure each include a plurality of conductive segments separated from each other and extending towards one of the first busbar or the second busbar. The electrode structure further includes electrode fingers arranged in an interdigitated manner and each connected to either the first conductive structure or the second conductive structure. The electrode fingers have a pitch that is different than a pitch of the plurality of conductive segments.

Surface acoustic wave electroacoustic device using gap grating for reduced transversal modes

An improved electroacoustic transducer with an improved mode profile is provided. The transducer comprises a velocity profile with a periodic structure and an edge structure flanking the periodic structure. The velocity profile also allows to suppress the SH wave mode.

Electroacoustic transducer with improved suppression of unwanted modes

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

An electroacoustic transducer having an alternative finger structure is provided. The number of fingers of a cell of length A is divisible by four. The electrode fingers of the cell are divided into four groups. The distance (&#x394;) between the second group and the third group is less than the distance (&#x394;) between the first group and the second group and less than the distance (&#x394;) between the third group and the fourth group.

Electroacoustic transducer having a piezoelectric substrate with electrode fingers divided into four groups

A transducer operating with surface acoustic waves is specified, which is divided into cells, whose length essentially equals one wavelength, comprising cells of the second type, which are SPUDT cells and which have an excitation intensity of 100%, and at least one cell of the first cell type, which has at least four excitation centers, wherein an excitation center lies between two adjacent fingers with different polarities, and wherein the cell of the first cell type has an excitation intensity of a maximum of 30%.

Transducer operating with surface acoustic waves and having four excitation centers

A surface acoustic wave (SAW) filter includes a transducer having an acoustic track to pass a SAW. A center frequency of the filter excites the SAW. The acoustic track includes cells along a longitudinal direction of the acoustic track. Each cell has electrode fingers. The cells include different cell types, where a cell type is defined by a connection sequence of electrode fingers of a cell. At least some of the cells are functional cells, each for exciting and/or reflecting the SAW. There are at least two functional cells, each of which includes at least one wide electrode finger and at least one narrow electrode finger. A reflective strength of a target functional cell is configurable by changing a width of an electrode finger in the target functional cell but by maintaining an overall width of the target functional cell substantially constant.

Surface acoustic wave transducer

Growing community of inventors

Munich, Germany

Thomas Ebner