How does 2 ssid or guest ssid operates on hardware level(antenna)

I have a question,
when you create 2 ssids or a guest network, how physical antennas handle it?
one antenna get assigned to one ssid or guest network or both antennas broadcast signals for both ssids?

It's pure software, antennae have nothing to do with it. Same radio, same channel, same antennae.

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it causes any performance issues? on main wifi ssid? if someone like to create separate guest ssid?

It shouldn't, barring any bugs in the wireless stack. Slow clients might slow it down though.

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