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US 9,667,224 B2Granted
Electroacoustic filter comprising low-pass characteristics
AssigneeQUALCOMM Incorporated
InventorsHolger Emrich, Clemens Ruppel, Martin Störkle, Werner Ruile, Thomas Finteis, Tilo Gärtner, Ingo Bleyl, Markus Mayer
Life of this patent
Estimating the term…
Abstract
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.
Claims19
An electroacoustic filter, comprising:
- an acoustic track;
- a first electroacoustic transducer arranged in the acoustic track, the first electroacoustic transducer being acoustically active in a frequency range around a center frequency f1;
- an acoustic element arranged in the acoustic track, the acoustic element being acoustically active in the frequency range around the center frequency f1;
- a grid structure arranged in the acoustic track between the first electroacoustic transducer and the acoustic element, wherein the grid structure is acoustically active in a frequency range around a center frequency f2, where f2>f1 and wherein the grid structure has a grid pitch PG, which is selected in order to dissipate energy of a frequency component f>f1;
- and
- wherein the grid structure is arranged as a bulk wave conversion structure, wherein the electroacoustic filter functions using acoustic surface waves or guided bulk acoustic waves.
3 more elements
An electroacoustic filter, comprising:
- an acoustic track;
- a first electroacoustic transducer arranged in the acoustic track, the first electroacoustic transducer being acoustically active in a frequency range around a center frequency f1;
- an acoustic element arranged in the acoustic track, the acoustic element being acoustically active in the frequency range around the center frequency f1;
- and
- a grid structure arranged in the acoustic track between the first electroacoustic transducer and the acoustic element, wherein the grid structure is acoustically active in a frequency range around a center frequency f2, where f2 lies in a range around 2*f1.
2 more elements
Dependencies are inferred from the claim text.