1. A broadband switched multiplexer comprising an input broadband demultiplexer comprising a broadband input port for receiving an input broadband signal and at least one output port having a passband; an output broadband multiplexer comprising at least two input ports and a broadband output port, each input port having a different passband, each input port passband overlapping a different portion of the demultiplexer output port passband; the demultiplexer output port being in electrical communication with the multiplexer input ports by signal paths, each signal path having a switch for opening and closing the path therein.