Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2004-08-23
2009-06-30
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S197000
Reexamination Certificate
active
07554425
ABSTRACT:
The electromechanical transducer (1) has a resonator element (20) and an actuator (30) for inducing an elastic deformation of the resonator element (20) dependent on the electrical input signal. For temperature stabilization, the electromechanical transducer (1) has a sensing element (40) for providing an electrical sensing signal has a function of a temperature of the resonator element (20), and a heating element (50) for heating the resonator element to reduce the temperature dependent frequency deviation to keep the resonance frequency equal to the nominal frequency at operating temperature. The heating element (50) is controlled by an electrical heating signal based on the electrical sensing signal. The resonator element may have the hating element or the sensing element; it may be part of a wheatstone bridge; it may consist of two longitudinally extendable parts (201, 202) extending in opposite directions, being attached in a support area (204) in a deformation free part (203).
REFERENCES:
patent: 6236281 (2001-05-01), Nguyen et al.
patent: 7068125 (2006-06-01), Lutz et al.
patent: 7102467 (2006-09-01), Lutz et al.
Steeneken Peter Gerard
Van Beek Jozef Thomas Martinus
NXP B.V.
Pascal Robert
Wong Alan
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