Branching filter and communication device

Details Branching filter and communication device Branching filter and communication device

2006-09-12

2006-09-12

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000

Reexamination Certificate

active

07106148

ABSTRACT:
A branching filter includes an antenna terminal, a transmission-side filter and a reception-side filter which are connected in parallel to the antenna terminal, and a matching circuit positioned between the antenna terminal and the reception-side filter. The reception-side filter is a ladder-type filter in which the frequency of a series resonator is higher than the antiresonant frequency of a parallel resonator. The transmission-side filter is a ladder-type filter and is the capacitance in the passband of the reception-side filter, and, because of the capacitance, the inductance of the impedance of the reception-side filter, when seen from the antenna terminal side, is reduced.

REFERENCES:
patent: 6262637 (2001-07-01), Bradley et al.
patent: 6897740 (2005-05-01), Fujino et al.
patent: 6995631 (2006-02-01), Taniguchi
patent: 2006/0055485 (2006-03-01), Lobeek
patent: 2001-024476 (2001-01-01), None
patent: 2003-022074 (2003-01-01), None
patent: 2003-163570 (2003-06-01), None
patent: 2003-347898 (2003-12-01), None
patent: 2004-007653 (2004-01-01), None

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