Re: allow full-duplex operation of a phone on a single frequency
Circulators have nothing to do with circular polarization. They are three-terminal A-B-C devices where signals can travel from A->B and B->C but not C->A or A->C. You connect the transmitter to A, the aerial to B, and the receiver to C. Inbound signals go from Aerial to Receiver, outbound from Transmitter to Aerial, but the high power from the transmitter never gets to the receiver (where it would wipeout any simultaneous received signal and/or damage the receiver). That way the aerial can be used for transmit & receive at the same time.
Biting the hand that feeds IT
