AdvancedA-007-004-003
The feed point in a centre-fed half-wave antenna is at the point of:
B
Answer
Interference, EMC, and safety
Type
A
minimum voltage and current
B
maximum current
C
maximum voltage
D
minimum current
Answer Notes
A standard centre-fed half-wave dipole is driven at its physical midpoint. As a standing wave forms along the antenna, the electrical characteristics vary depending on the position along the wire. At the exact centre, the impedance is at its lowest point, typically around 73 ohms in free space.
Because this impedance is lowest at the center, the current peaks at its maximum and the voltage drops to its minimum. This high-current, low-voltage point makes it highly compatible with standard coaxial cable, which is designed as a low-impedance feedline.
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In a half-wave dipole, the distribution of _______ is lowest at each end.
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In a half-wave dipole, the lowest distribution of _________ occurs at the middle.