Invention Grant
US08823469B2 Saw filter and a receiver for remote keyless entry and tire pressure monitoring systems using same
有权
用于远程无钥匙进入的锯片过滤器和接收器以及使用它的轮胎压力监测系统
- Patent Title: Saw filter and a receiver for remote keyless entry and tire pressure monitoring systems using same
- Patent Title (中): 用于远程无钥匙进入的锯片过滤器和接收器以及使用它的轮胎压力监测系统
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Application No.: US13201425Application Date: 2010-02-17
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Publication No.: US08823469B2Publication Date: 2014-09-02
- Inventor: Thomas Telgmann
- Applicant: Thomas Telgmann
- Applicant Address: DE Munich
- Assignee: Epcos AG
- Current Assignee: Epcos AG
- Current Assignee Address: DE Munich
- Agency: Slater & Matsil, L.L.P.
- Priority: DE102009009484 20090219
- International Application: PCT/EP2010/051989 WO 20100217
- International Announcement: WO2010/094707 WO 20100826
- Main IPC: H03H9/64
- IPC: H03H9/64 ; G08C17/02 ; H04B1/16 ; H03H9/02 ; B60C23/04 ; B60R25/24 ; G07C9/00

Abstract:
A SAW filter includes at least four electrically interconnected DMS tracks. First and second tracks of the at least four DMS tracks are connected in parallel in opposite directions to form a first filter element. The first and second tracks have two resonant frequencies that are offset from one another from track to track within the first filter element such that they define a common passband by virtue of a lower-frequency resonance of the first track being in phase at the same frequency as a higher-frequency resonance of the second track. Third and fourth tracks of the at least four DMS tracks can be connected in a similar fashion to form a second filter element. The passbands of the first and second filter elements are offset from one another and each comprise one of two channels of a two-channel filter.
Public/Granted literature
- US20120001727A1 SAW FILTER Public/Granted day:2012-01-05
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