AdvancedA-007-004-010

In a half-wave dipole, where does the minimum current occur?

A
Answer
Interference, EMC, and safety
Type
A
At both ends
B
It is equal at all points
C
At the centre
D
At the right end

Answer Notes

RF current in a resonant half-wave dipole behaves as a standing wave. Current requires a continuous path for electrons to flow freely. Because the antenna wire abruptly ends at both tips, the electrons physically have nowhere else to go. Consequently, the RF current must drop to zero—its absolute minimum—at both ends of the dipole. By contrast, the current is highest at the center where the antenna is typically fed. Distractors claiming the center is the minimum or suggesting the current is equal throughout the wire fail to account for the physical boundary conditions created by the ends of the antenna wire.
Previous · A-007-004-009
In a half-wave dipole, where does minimum voltage occur?
Next · A-007-004-011
In a half-wave dipole, where does the minimum impedance occur?