Amateur Extra › E9 Antennas and Transmission Lines › E9D12
E9D12
What is the purpose of making a Yagi's parasitic elements either longer or shorter than resonance?
Pick an answer to check it.
Answer: C. Control of phase shift
Making parasitic elements longer or shorter than resonance controls the phase of their currents. That phase sets whether they act as reflectors or directors.
Tip: Element length sets phase.