Discussion
Consider the following statements about a half wave dipole.
1. Its current is maximum at the centre and zero at the ends
2. Its directivity is 1.64 relative to an isotropic radiator
3. Its radiation pattern has a maximum along the wire axis
Which of the statements given above is or are correct?
Answer: B
The first two are correct and are the standard facts about the antenna. The third is the reverse of the truth: the axial direction is a null, and the maximum is broadside. Every linear current distribution shares that axial null, because the far field of a current element is proportional to the sine of the angle from the wire. Getting the orientation right is essential before any coverage prediction is attempted.
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