Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2005-03-22
2005-03-22
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000
Reexamination Certificate
active
06870440
ABSTRACT:
A surface acoustic wave duplexer having an antenna terminal, a transmitting terminal and a receiving terminal. The surface acoustic wave duplexer includes a transmitting SAW filter coupled between the antenna terminal and the transmitting terminal, a receiving SAW filter coupled between the antenna terminal and the receiving terminal, a common piezoelectric substrate on which both of the transmitting SAW filter and the receiving SAW filter are formed, a package covering the common piezoelectric substrate. The antenna terminal, the transmitting terminal and the receiving terminal are formed on the package, and a frequency adjusting circuit is coupled between the antenna terminal and the transmitting SAW filter or the receiving SAW filter. The frequency adjusting circuit has a capacitance element.
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Fujita Yoshiaki
Komazaki Tomokazu
Shimamura Hajime
Burdett James R.
Oki Electric Industry Co. Ltd.
Venable LLP
Vivarelli, Jr. Daniel G.
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