3-frequency branching circuit, branching circuit and radio...

Details 3-frequency branching circuit, branching circuit and radio... 3-frequency branching circuit, branching circuit and radio...

2008-01-29

2008-01-29

Ho, Duc (Department: 2619)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C370S276000, C370S338000, C370S347000, C445S072000, C445S060000

Reexamination Certificate

active

07324493

ABSTRACT:
A 3-frequency branching circuit in the past could not be used for a system wherein a TDMA method such as GSM and DCS and a W-CDMA method such as UMTS are mixed. The 3-frequency branching circuit equipped with branching means having first and second internal terminals, an antenna terminal of connecting to an antenna, a low-pass filter connected between the first internal terminal and the antenna terminal, and a high-pass filter connected between the second internal terminal and the antenna terminal, a switching circuit of switching between GSM TX and GSM RX, a switching circuit of switching between DCS TX, DCS RX and a third internal terminal, and a duplexer connected to the third internal terminal.

REFERENCES:
patent: 5896562 (1999-04-01), Heinonen
patent: 6738611 (2004-05-01), Politi
patent: 2007/0026817 (2007-02-01), Kodama
patent: 998035 (2000-05-01), None
patent: 1003291 (2000-05-01), None
patent: 2000-165274 (2000-06-01), None
patent: 2000-165288 (2000-06-01), None
Japanese Language International Search Report for PCT/JP01/05414 dated Oct. 2, 2001.
English translation Form PCT/ISA/210.

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