Radio communication device that meets a plurality of...

Details Radio communication device that meets a plurality of... Radio communication device that meets a plurality of...

2006-07-18

2006-07-18

Ramos-Feliciano, Eliseo (Department: 2617)

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

C455S078000, C455S562100

Reexamination Certificate

active

07079817

ABSTRACT:
It is an object of the present invention to switch bands with a simple structure in which frequency bands can be individually switched respectively in a transmission and a reception and only a receiving part can be switched to another frequency band without disconnecting an upward line during communication.The device of the invention includes an antenna (1) capable of transmitting and receiving radio waves of first and second frequency bands, a wave separator (2), antenna sharing devices (3A,3B) respectively provided so as to correspond to the frequency bands, transmitting circuits (4A,4B), transmitting PLL synthesizers (5A,5B), receiving circuits (6A,6B) and receiving PLL synthesizers (7A,7B). A control part102controls, through a common three-line serial bus, the transmitting PLL synthesizers (5A,5B), the receiving PLL synthesizers (7A,7B), a transmitting band switching signal generating circuit (8) and a receiving band switching signal generating circuit (9) to individually switch the frequency bands respectively in the transmission and the reception.

REFERENCES:
patent: 5915212 (1999-06-01), Przelomiec et al.
patent: 6658263 (2003-12-01), Ke et al.
patent: 2002/0039912 (2002-04-01), Yamaguchi et al.
patent: 05-26003 (1993-10-01), None
patent: 8-293846 (1996-11-01), None
patent: 2000-244360 (2000-09-01), None
patent: 2000-269848 (2000-09-01), None
patent: 2001-267952 (2001-09-01), None
patent: 2001-285114 (2001-10-01), None

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