What is the purpose of making a Yagi’s parasitic elements either longer or shorter than resonance?
Wind torque cancellation
Mechanical balance
Control of phase shift✓Richtige Antwort
Minimize losses
Erklärung
A parasitic element is excited by the field from the driven element, and the current it re-radiates leads or lags depending on whether the element is inductive (longer than resonance) or capacitive (shorter). Setting that phase relationship is exactly how the re-radiated fields are made to add forward and cancel to the rear.