Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-01-18
2005-01-18
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S194000, C333S195000, C310S31300R
Reexamination Certificate
active
06844795
ABSTRACT:
A SAW (Surface Acoustic Wave) filter includes serial arm resonators and parallel arm resonators interconnected in pairs in a multiple-stage, ladder configuration. A resonating device is serially connected to any one of the serial arm resonators and has an attenuation pole frequency higher than that of the serial arm resonator. At the attenuation pole frequency of the serial arm resonator, the resonating device functions as capacitance without performing attenuation. The resonating device has an antiresonance frequency 1.8 times or more but 2.2 times or less, or 2.7 times or more but 3.3 times or less, as high as the antiresonance frequency of the serial arm resonator.
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Mitsutaka Hikita, et al, “Experiments of High-Performance SAW Filters for Mobile Radio Transceivers”, Transactions of the Institute of Electronics, Information and Communication Engineers of Japan, vol. J76-A, No. 2, pp. 236-244 (1993).
Yuji Suzuki, et al, “Coupled-Mode Theory of SAW Periodic Structures”, Transactions of the Institute of Electronics, Information and Communication Engineers of Japan, vol. J76-A, No. 2, pp. 87-95 (1993).
Oki Electric Industry Co. Ltd.
Rabin & Berdo P.C.
Summons Barbara
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