Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2011-06-21
2011-06-21
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000, C333S195000, C310S31300R
Reexamination Certificate
active
07965155
ABSTRACT:
The present invention provides a surface acoustic wave resonator capable of improving a leak of a surface acoustic wave in the transverse direction and reducing the spurious and having superior characteristics. In a surface acoustic wave filter according to the present invention, an interdigital transducer electrode and reflector electrodes are formed on a piezoelectric substrate, and a SiO2thin film is formed on at least a portion of the interdigital transducer electrode. The interdigital transducer electrode includes a bus-bar electrode region, a dummy electrode region and a finger overlap region, such that the SiO2thin film is removed from upper sections of the bus-bar electrode regions of the interdigital transducer electrode.
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Partial English language translation of JP 61-62221 published Mar. 1986.
Partial English language translation of JP 6-164297 published Jun. 1994.
Iwasaki Yukio
Matsunami Ken
Nakamura Hiroyuki
Nakanishi Hidekazu
Tsurunari Tetsuya
Panasonic Corporation
Summons Barbara
Wenderoth , Lind & Ponack, L.L.P.
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