Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2007-12-11
2007-12-11
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S188000, C333S200000, C310S312000
Reexamination Certificate
active
11550983
ABSTRACT:
A method for modifying the resonance frequency of a micro-mechanical resonator, and resonators on which the method is practiced. A packaged resonator is trimmed by directing electromagnetic energy to the resonator through a transparent portion of the package. The removal of mass (by the energy) affects the resonance frequency of the resonator in a predictable manner. In some embodiments, the energy is sourced from a femtosecond laser. In some variations of the illustrative embodiment, the amount of mass to be removed is determined as a function of its location on the resonator. A mass-trimming map is developed that identifies a plurality of potential mass-trimming sites on the resonator. A site can be classified as a fine-tuning site or a coarse-tuning site as a function of the degree to which mass removal at those sites affects the resonance frequency. The sites can also be characterized as a function of their position relative to features of the resonator (e.g., nodal lines, etc.). Based on a differential between the measured and desired resonance frequency of the resonator, and expressions that relate resonance frequency to location-dependent mass, actual sites for mass removal are selected from among of the plurality of potential mass-trimming sites.
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Hsu Wan-Thai
Huang Xiangxiang
MacDonald James D.
Lempia Braidwood LLC
Summons Barbara
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