I couldn't find a solution by searching and the question might also be of interest for others, so I am asking it here:
Many WLAN-routers/IADs allow simultaneous use of WiFi 2.4 and 5.2 GHz. However, only the usual 2 antennas are build on these devices.
Would it be possible to implement that with a RouterBoard (e.g. RB/493)? It is clear that there have to be two radio cards on the RouterBoard each for one frequency in use.
But how could one connect the two radios (= 4 antenna cable) to only 2 antennas? According to my limited understanding of RF, a kind of "mixer" should be possible with appropriate wideband antennas (2.4 and 5.2 GHz).
A little picture is attached.
Or is there a MT supported WiFi radio which could simultaneously use 2.4 and 5.2 GHz?
I hope the objective is understandable and I would appreciate any hints.