Devices having a phased-array antenna and calibration method therefor

A method comprising:

• providing a test signal to each of a plurality of antenna channels via a test signal line, each antenna channel including an amplitude adjustor and a phase adjustor associated with at least one antenna element;
• for each of the antenna channels, modulating the test signal provided to the antenna channel to produce a modulated test signal by:
• i) controlling the amplitude adjustor of the antenna channel to vary a current amplitude of the test signal between a plurality of amplitude states, and ii) controlling the phase adjustor of the antenna channel to vary a current phase of the test signal between a plurality of phase states, and
• processing a received test signal received from the antenna channels to determine amplitude and phase errors associated with the modulated test signals associated with the antenna channels, wherein the processing the received signal includes:
• isolating residual amplitude modulation effects resultant from phase variations imparted by the phase adjustors, and residual frequency modulation effects resultant from amplitude variations imparted by the amplitude adjustors,
• wherein the processing the received signal includes:
• isolating residual amplitude modulation effects resultant from phase variations imparted by the phase adjustors, and residual frequency modulation effects resultant from amplitude variations imparted by the amplitude adjustors.