Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-09-20
2005-09-20
Callahan, Timothy P. (Department: 2816)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S196000, C310S31300R, C310S361000
Reexamination Certificate
active
06946930
ABSTRACT:
A reliable SAW device has excellent reflection and a small size, which is achieved by reducing the number of fingers defining reflectors, such that losses due to a large electromechanical coupling coefficient are small and the film thickness of electrodes has much less effect on frequencies of the device. In the SAW device having pluralities of first fingers and second fingers, disposed on a quartz substrate, constituting an IDT for exciting SH waves and reflectors for reflecting the SH waves, respectively, the first and second fingers made mainly from Al are disposed on the ST-cut 90° X-propagation quartz substrate with the Euler angles (0°, θ, 90°±2°), wherein the angle θ is within the range of about 110° to about 150°, and a normalized film thickness (H/λ) of the fingers is within in the range of about 0.025 to about 0.135.
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Michio Kadota et al., “Small-Sized Resonator Filter using Love Type SH SAW on Quartz”, Operational Committee for the 21st Symposium of Basics and Application of Ultrasonic Electronics, Nov. 6, 2000, pp. 59-60.
Japanese Examination Report (Final Rejection) Corresponding to Japanese Patent Application No. 2001-132655; “Surface Acoustic Wave Filter”; Japanese Examination Report was dispatched on Oct. 21, 2003.
Kadota Michio
Nakao Takeshi
Callahan Timothy P.
Keating & Bennett LLP
Luu An T.
Murata Manufacturing Co. Ltd.
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