Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2011-04-12
2011-04-12
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S195000, C333S193000
Reexamination Certificate
active
07924118
ABSTRACT:
In a duplexer, a transmission elastic wave filter and a reception elastic wave filter are mounted on a laminated substrate, a coil connected between an antenna terminal and a ground potential is provided on the laminated substrate, the reception elastic wave filter has first and second ground pads connected to ground potentials of IDTs connected to first and second balanced terminals, the distance between the second ground pad and the coil is greater than the distance between the first ground pad and the coil, and an inductance component in a conductive path E connecting the second ground pad to the second ground terminal is less than an inductance component in a conductive path D connecting the first ground pad to the first ground terminal, so as to improve isolation characteristics between first and second balanced terminals of a reception filter chip.
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Official Communication issued in International Patent Application No. PCT/JP2008/055434, mailed on Jul. 15, 2008.
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Pascal Robert
Wong Alan
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