Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2007-11-12
2011-12-06
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000, C333S195000
Reexamination Certificate
active
08072293
ABSTRACT:
A surface acoustic wave filter comprised of a plurality of surface acoustic wave resonators having different resonance frequencies, the filter comprising a substrate made of lithium niobate, comb electrodes (1201and1202) formed on the substrate, and a thin dielectric film covering the comb electrodes (1201and1202), wherein the surface acoustic wave resonator having a lower resonance frequency is formed to have a metallization ratio larger than a metallization ratio of the surface acoustic wave resonator having a higher resonance frequency, thereby providing the surface acoustic wave filter and an antenna duplexer featuring superior characteristics with insignificant ripples while suppressing spurious responses of the surface acoustic wave resonators.
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International Search Report issued Jan. 8, 2008 in the International (PCT) Application of which the present application is the U.S. National Stage.
Matsunami Ken
Nakamura Hiroyuki
Nakanishi Hidekazu
Tsurunari Tetsuya
Panasonic Corporation
Summons Barbara
Wenderoth , Lind & Ponack, L.L.P.
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