Split band duplexer

Details Split band duplexer Split band duplexer

2007-07-09

2010-02-02

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S101000, C333S185000

Reexamination Certificate

active

07656251

ABSTRACT:
The present invention is a split band duplexer, which increases the separation between a transmit passband and a receive passband by splitting the transmit and receive passbands into sub-bands. Each sub-band has a bandwidth that is less than the bandwidth of the full passband. The increased separation increases isolation margins and insertion loss margins, which allows use of standard filter components, such as surface acoustic wave (SAW) filters, and their accompanying manufacturing tolerances and drift characteristics. In one embodiment of the present invention, the split band duplexer includes a first sub-band duplexer and a second sub-band duplexer. The first sub-band duplexer may provide a full bandwidth transmit passband and a receive passband that is less than full bandwidth. The second sub-band duplexer may provide a full bandwidth receive passband and a transmit passband that is less than full bandwidth.

REFERENCES:
patent: 5768691 (1998-06-01), Matero et al.
patent: 6380823 (2002-04-01), Ikata et al.
patent: 7187945 (2007-03-01), Ranta et al.
patent: 7251499 (2007-07-01), Ella et al.
patent: 7383024 (2008-06-01), Mueller et al.
patent: 7383032 (2008-06-01), Frank et al.
patent: 7570622 (2009-08-01), Totsuka et al.
patent: 2008/0205548 (2008-08-01), Rofougaran

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