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US 2013/0257562 A1Published application
Acoustic wave filter having reduced non-linearities, and method for production
AssigneeEpcos AG
InventorEdgar Schmidhammer
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Abstract
An acoustic wave filter having reduced non-linearities as well as a production method are disclosed. A filter comprises a first electroacoustic transducer having a first metallization ratio and a second electroacoustic transducer having a second metallization ratio. The metallization ratios range from 0.2 to 0.8, and the metallization ratio of the first transducer is no more than 0.8 times the metallization ratio of the second transducer.
Claims10
An acoustic wave filter, comprising:
- a first electroacoustic transducer for surface acoustic waves or for guided bulk acoustic waves having a first metallization ratio η1;
- and
- a second electroacoustic transducer having a second metallization ratio η2, wherein the following hold true:
- 0.2≦η1≦0.8,
- 0.2≦η2≦0.8
- and
- η1/η2≦0.8.
4 more elements
A method for producing an acoustic wave filter, comprising the following steps:
- providing a filter comprising a first transducer having a first metallization ratio η1 and a second transducer having a second metallization ratio η2;
- progressively reducing the ratio η1/η2 and determining the nonlinear components up to η1=0.2 and η2=0.8;
- and
- setting the ratio η1/η2 which is distinguished by the smallest undesirable frequency components.
1 more element
Dependencies are inferred from the claim text.