How two antenna will communicate through a single channel without interfering with each other?
Two antennas can communicate using a single frequency by the principle of orthogonality, i.e. equal frequencies being out of phase by 90 degrees. This principle is used in CDMA, OFDM etc.
https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing
https://en.wikipedia.org/wiki/Code_division_multiple_access
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