Discussion
Why do phased arrays suffer beam squint with frequency when fed by fixed delays of phase?
Answer: D
Steering by phase rather than by true time delay means the beam points where the phase gradient matches the required delay, and since that delay is frequency dependent the beam direction moves as frequency changes. Wideband arrays therefore use true time delay steering. Element resonance, mutual coupling and feed loss all vary with frequency too, but none of them produces the systematic squint that the phase versus delay distinction does.
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