Multi-branch antenna signal separating device

Details Multi-branch antenna signal separating device Multi-branch antenna signal separating device

2007-12-11

2007-12-11

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S129000, C333S132000

Reexamination Certificate

active

11090709

ABSTRACT:
One aspect of the invention provides a signal separating device comprising a first and a second circuit branch connected to an antenna port, the first circuit branch comprising a filter for passing signals in a first frequency band, and the second circuit branch comprising a filter for passing signals in a second frequency band. The first and second circuit branches being arranged so that a respective reactive impedance is presented to the antenna port in both said first and said second frequency bands. The device further comprises an impedance matching circuit at the antenna port arranged to substantially to cancel out the respective reactive impedances. In the preferred embodiment, each circuit branch presents a respective shunt capacitance to the antenna port when out-of-band and the matching circuit comprises a shunt inductor at the antenna port.

REFERENCES:
patent: 6937113 (2005-08-01), Ohashi et al.
patent: 6982612 (2006-01-01), Sakano
patent: 0 871 288 (1998-10-01), None
patent: 0 872 953 (1998-10-01), None

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