Qualcomm Incorporated

Snaptrack Incorporated

Holger Emrich

Werner Ruile

Markus Mayer

Ingo Bleyl

Clemens Ruppel

Jacques Antoine Damy

Tilo Gärtner

Christian Waterkeyn

Martin Störkle

Thomas Finteis

An electroacoustic filter has improved low-pass characteristics. The filter includes a first electroacoustic converter, an electroacoustic element and a grid structure between the converter and the element. The grid structure is acoustically active in one frequency range that lies above the acoustically active frequency range of the first electroacoustic converter.

Electroacoustic filter comprising low-pass characteristics

A filter working with surface acoustic waves comprises a piezoelectric substrate (SU), a first transducer (IDT) arranged in the acoustic track coupled to an input, having a first mean finger period (pi) assigned to a center frequency of a pass band of the filter and a second transducer (IDT) arranged in the acoustic track coupled to an output, having the same first mean finger period (p), and a reflector arranged between first and second transducer having a second mean finger period (p) assigned to a stop band frequency different from the center frequency. Further, a new type of very broad bandwidth filters with small insertion loss and high return loss and high rejection are given that use a substrate that can propagate a PSAW and comprises fan shaped transducers.

Saw filter with improved stop band suppression

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Munich, Germany

Holger Emrich