Phase in electromagnetism: why it’s essential to antenna measurement

Phase-shifted electromagnetic waves emitted by a phased antenna array, illustrating the phase difference (Δφ) used in antenna measurement

Phase describes where a wave sits in its oscillation cycle. In antenna measurement, phase, together with amplitude, fully defines the electromagnetic field. Without phase data, you cannot reconstruct a radiation pattern, steer a phased array, or diagnose manufacturing defects. Because phase can’t be observed directly, it’s harder and more expensive to measure than amplitude, which […]