Arrangement for transmitting and receiving radio frequency signal at two frequency bands
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United States of America Patent
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Jan 11, 2000
Grant Date -
N/A
app pub date -
Jul 16, 1997
filing date -
Jul 18, 1996
priority date (Note) -
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status (Latency Note)
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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.
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