A nonreciprocal phased-array antenna includes an array of resonant antennas a1, . . . , an. During transmission, an outbound signal having a frequency f0 and a phase shift φdi caused by propagation through a data network feeds into each resonant antenna ai. Each resonant antenna ai upconverts the outbound signal using a modulation signal having a frequency fm and a phase shift φmi caused by propagation through a modulation network to produce an upconverted radiated signal having a frequency f0+fm and a phase proportionate to φdi+φmi. During reception, an inbound signal of frequency f0+fm is received at each resonant antenna ai and is downconverted using the modulation signal to produce a downconverted signal having a frequency f0 and a phase proportionate to −φmi. After passing through the data network to the inbound port, the downconverted signal has a phase proportionate to φdi−φmi.