Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1997-07-16
2000-01-11
Hudspeth, David R.
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
455 332, 455 561, 455 59, 455267, 455 82, 455 83, 455 86, H04B 140, H04B 144
Patent
active
06014551&
ABSTRACT:
The present invention relates to an arrangement for transmitting a radio-frequency signal at two different frequency bands and for receiving at two different frequency bands. The arrangement can be applied for instance to a transceiver of a radio communications system operating at two different frequency bands, or to a transceiver meant to be used in connection with two different radio communications systems. One of the ideas of the invention is that one and the same filter (72), belonging to the RF front end of the antenna circuit, is used for filtering interference from at least two signals located at different frequency bands, in which case the number of filters (72, 75) can be reduced. By means of the solution suggested in the invention, also the number of controllable switches (73) provided on the signal path of the RF front end can be minimized.
REFERENCES:
patent: 5091919 (1992-02-01), Kuisma
patent: 5123031 (1992-06-01), Kuisma
patent: 5590412 (1996-12-01), Sawai et al.
patent: 5758266 (1998-05-01), Kornfeld
Lehtinen Kari T.
Pesola Mikko
Hudspeth David R.
Nokia Mobile Phones Ltd.
Zewdu Meless
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