Multiplex communications – Duplex
Reexamination Certificate
2005-09-27
2005-09-27
Duong, Frank (Department: 2666)
Multiplex communications
Duplex
C370S297000, C455S078000, C455S083000
Reexamination Certificate
active
06950410
ABSTRACT:
Multiple circuits connected to a common terminal are switched where the frequency bands to be conducted through the circuits are close. Each circuit has an independent signal path to the common terminal which contains a filter and a device. Each device has a first and a second state. Each circuit has a first filter characteristic that passes a first frequency band and substantially blocks the second frequency band. Each circuit has a second filter characteristic which substantially blocks the first and second frequency bands when the device is in the second state, wherein the second filter characteristic is a result of the device and a filter acting in combination. As a result, the frequency multiplexer can have multiple frequency bands in a narrow frequency range connected to a common terminal with minimum signal loss.
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patent: 6023611 (2000-02-01), Bolin et al.
patent: 6308051 (2001-10-01), Atokawa
patent: 6332071 (2001-12-01), Brandt
patent: 19842706 (2000-03-01), None
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patent: 1014592 (2000-06-01), None
patent: 99/52172 (1999-10-01), None
Potomac Patent Group PLLC
Telefonaktiebolaget LM Ericsson (publ)
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