Multiplexing/demultiplexing an fdm of rf signal channels

Details Multiplexing/demultiplexing an fdm of rf signal channels Multiplexing/demultiplexing an fdm of rf signal channels

H - Electricity

04

J

H04J 1/08 (2006.01) H01P 1/213 (2006.01) H04B 7/185 (2006.01)

Patent

CA 2203959

A multiplexer comprises a number of directional filters 17n connected to a transmission line feeding an antenna 2, 3. Signals to be multiplexed fed to the filters 17n may be sent via respective switches 16n. 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.

L'invention est un multiplexeur comportant une multiplicité de filtres directionnels 17n connectés à une ligne de transmission qui alimente une antenne 2, 3. Les signaux à multiplexer qui sont transmis aux filtres 17n peuvent transiter via des commutateurs individuels 16n. Contrairement aux multiplexeurs actuels dans lesquels chaque filtre directionnel définit un canal particulier, les canaux du multiplexeur de l'invention, à l'exception d'un à l'extrémité, sont définis par la bande passante d'un filtre directionnel et par la bande de blocage d'un autre filtre directionnel, car la bande passante des filtres directionnels entre l'entrée connectée au commutateur et la sortie connectée à la ligne de transmission, ainsi que la bande de blocage correspondante entre les deux ports de sortie connectés à la ligne de transmission, se chevauchent. Le même montage peut être utilisé pour le démultiplexage.

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