Multiplexing/demultiplexing an FDM of RF signal channels
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United States of America Patent
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Jul 27, 1999
Grant Date -
N/A
app pub date -
May 5, 1997
filing date -
May 23, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiplexer comprises a number of directional filters 17.sub.n connected to a transmission line feeding an antenna 2, 3. Signals to be multiplexed fed to the filters 17.sub.n may be sent via respective switches 16.sub.n. Unlike prior multiplexers where each directional filter defines a respective channel of the multiplex, the channels of the multiplexer of the invention, apart from one at the end, are defined by the band pass response of one directional filter and the band stop response of another directional filter, since the band pass responses of the directional filters from the input connected to the switch to the output connected to the transmission line, and the corresponding band stop responses between the two output ports connected to the transmission line, overlap each other. The same arrangement may be used for demultiplexing.
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