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The NI PXI-2544 from National Instruments is a PXI RF Multiplexer with Frequency 6.6 GHz. More details for NI PXI-2544 can be seen below.
600 MHz RF PXI Multiplexers
SP6T & SP4T PXI Microwave Multiplexer Modules
6 Channel Single/Dual 40 GHz PXI Multiplexer
You can now find similar products from multiple companies on everything RF.