Discussion
Why does a series fed array squint with frequency?
Answer: C
The progressive phase is set by the electrical length of line between elements, and that length in wavelengths changes with frequency, so the beam direction moves. A corporate feed avoids it by making every path the same length. Element resonance, coupling variation and loss all change with frequency too but none produces a systematic beam shift. Distinguishing a fixed phase from a fixed delay explains this and several other frequency dependent effects in arrays.
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