Surface acoustic wave device and communication device
Patent 6936952 Issued on August 30, 2005. Estimated Expiration Date: 
September 19, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 19, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSurface wave filter for asymmetrical/symmetrical and symmetrical/symmetrical operating mode Surface acoustic wave filter with a threefold mode filter section and a resonator Hybrid leaky surface acoustic wave resonator filter Surface acoustic wave apparatus and communication unit Patent #: 6815868 InventorAssigneeApplicationNo. 10665107 filed on 09/19/2003US Classes:310/313D, Grating or reflector in wave path333/193, Using surface acoustic waves333/133, Utilizing electromechanical transducer333/195With wave-modifying means (e.g., reflectors, resonators, diffractors, multistrip couplers, etc.)ExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmForeign Patent References
International ClassH01L041/08AbstractA surface acoustic wave device has a balanced-to-unbalanced conversion function, in which the common mode in the vicinity of outside the passband is satisfactory. The surface acoustic wave device includes surface acoustic wave filters having interdigital transducers (IDTs) arranged along a surface acoustic wave propagation direction, which filters are provided on a piezoelectric substrate so as to have a balanced-to-unbalanced conversion function, and balanced signal terminals are correspondingly connected to the surface acoustic wave filters. Surface acoustic wave resonators including an interdigital transducer sandwiched between reflectors are correspondingly connected in series to the balanced signal terminals. The center-to-center distance between mutually adjacent electrode fingers in the reflectors and the interdigital transducer in one of the surface acoustic wave resonators differs from that of the other surface acoustic wave resonator.Field of SearchSurface acoustic wave devicesInterdigitated electrodes Envelope or apodized Grating or reflector in wave path Using surface acoustic waves Including spurious signal prevention or reduction means With wave-modifying means (e.g., reflectors, resonators, diffractors, multistrip couplers, etc.) With response weighting means Utilizing electromechanical transducer | |
