Duplexer and communication apparatus using the same

Details Duplexer and communication apparatus using the same Duplexer and communication apparatus using the same

2011-01-11

2011-01-11

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S195000

Reexamination Certificate

active

07868715

ABSTRACT:
The present invention provides a duplexer using a ladder-type filter, which has a small size and is superior in isolation characteristic, and a communication apparatus using such a duplexer. A series resonator (R1) contained in a first filter element (F1) and a parallel resonator (R4) contained in a second filter element (F2) are disposed so as not to allow the elastic wave propagating paths to be overlapped with each other. By disposing them in this manner, it is possible to prevent an elastic wave, leaked from the series resonator (R1) and most influential to the isolation characteristic, from being received by the parallel resonator (R4). Consequently, it is possible to achieve a small-size duplexer that is superior in isolation characteristic.

REFERENCES:
patent: 6903630 (2005-06-01), Miura et al.
patent: 6975185 (2005-12-01), Tsutsumi et al.
patent: 7180388 (2007-02-01), Matsuda et al.
patent: 7202590 (2007-04-01), Matsuda et al.
patent: 7227429 (2007-06-01), Kawachi et al.
patent: 7400216 (2008-07-01), Fuse
patent: 2003/0214372 (2003-11-01), Miura et al.
patent: 2004/0095206 (2004-05-01), Tsutsumi et al.
patent: 2004/0207485 (2004-10-01), Kawachi et al.
patent: 2004/0222717 (2004-11-01), Matsuda et al.
patent: 2005/0156687 (2005-07-01), Matsuda et al.
patent: 2006/0197630 (2006-09-01), Fuse
patent: 05-167388 (1993-07-01), None
patent: 2002-176335 (2002-06-01), None
patent: 2004-048240 (2004-02-01), None
patent: 2004-336503 (2004-11-01), None
patent: 1020040096780 (2004-11-01), None
patent: WO 2005/011114 (2005-02-01), None
Chinese language office action and its English language translation for corresponding Chinese application 2006800396638 lists the references above, Dec. 11, 2009.
European search report for corresponding European application 06822353.6 lists the references above, Aug. 21, 2009.
Japanese language office action and its English language translation for corresponding Japanese application 2007542656.

Affiliated with

Also associated with

Rating

Duplexer and communication apparatus using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Duplexer and communication apparatus using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Duplexer and communication apparatus using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2681091