Requirement for a Specific RF Splitter with Port Identification!

I want to split RF Power to connect 2 antennas to the sime port for RFID tag detection. Is there any splitter in the market that can tell me which port(of the splitter) has detected the RFID tag by appending some data bits to it or by any other mechanism?

You can use SPDT, of course you know which port ia active.
And you can use directional antenna, for each branch, you can combine a ref signal.

I need a splitter that can append a digital sequence with the data the antenna is receiving so that I can know about the port.