"Identical antennas" depends on the context. If you are talking about an antenna array, then all characteristics should be matched. If you are talking about a transmitter-receiver pair, then the radiation patterns should be matched for best energy transfer.
What context was the phrase used in that prompted your quesiton?
One is receiver and the other is transmitter. They have same polarization and their radiation pattern peaks "look at each other". Both antennas are matched and lossless.
One is receiver and the other is transmitter. They have same polarization and their radiation pattern peaks "look at each other". Both antennas are matched and lossless.
"Identical antennas" means antennas designed in the same way (same type of excitation, same materials...), performed in the same technology and so same RF performances.
It's an ideal concept..... two things are ideally never the same...
yes, measure them and check if the "identical" premise is true. I am now involved on fabrication of antennas which should be identical (same mnfg process and so on), and they never are. Dispersion curves must be generated to check how different they are