Dual-channel passband filtering system using acoustic...

Details Dual-channel passband filtering system using acoustic... Dual-channel passband filtering system using acoustic...

2007-03-20

2007-03-20

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S552100, C455S340000, C333S013000, C333S190000

Reexamination Certificate

active

09965637

ABSTRACT:
A dual-channel passband filtering system having a first, second and third balanced ports for connecting, respectively, to a first transceiver, an antenna and a second transceiver. A first lattice-type passband filter is connected between the first and the second port, and a second lattice-type passband filter is connected between the second and the third port. A phase shifter is used to match the first and second transceiver and the second port. A balun can be used for each port to convert the balanced port to a single-ended port. In each passband filter, two series resonators are use to provide two balanced ends, and two shunt resonators are connected to the series resonators in a crisscross fashion to form a differential or balanced topology. The first and second passband filters have different frequencies.

REFERENCES:
patent: 3727154 (1973-04-01), Dailing et al.
patent: 6081171 (2000-06-01), Ella
patent: 6721544 (2004-04-01), Franca-Neto
patent: 2003/0179053 (2003-09-01), Aigner et al.
patent: 1058383 (2000-06-01), None
patent: 1017170 (2000-07-01), None
patent: 1058383 (2000-12-01), None
patent: 2000-349588 (1999-06-01), None

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