Epcos Ag

Dietmar Ritter

Andreas Detlefsen

Thomas Bauer

Peter Kirchhofer

Martin Bünner

An apparatus includes a piezoelectric substrate having a signal line with a first electrical port and a second electrical port, and a first partial filter connected in series with a second partial filter. The partial filters are arranged between the electrical ports. The first partial filter includes a first serial transducer and a second serial transducer located in an acoustic path and in series branches of the signal line. The serial transducers are acoustically coupled with one another. The second partial filter includes a coupler transducer and an end-positioned transducer that are located in a double mode surface acoustic wave (DMS) path. The end-positioned transducer is positioned at an end of the signal line.

Electronic component operated with surface acoustic waves

For improved conformance of a filter operating with acoustic waves, a transducer structure is provided in which the separations between respectively two adjacent electrode fingers of an inter-digital transducer (IDT) vary over the length of the transducer. The variation thereby preferably follows a continuous distribution function. Reactance filters that are provided with such filters in the serial branch show an improved electrical conformance in the transmission range.

Growing community of inventors

Starnberg, Germany

Dietmar Ritter