Discussion
Statement I: A short dipole has much lower directivity than a half wave dipole.
Statement II: A short dipole has much lower radiation resistance than a half wave dipole.
In the light of the above statements, choose the correct answer.
Answer: A
The second is correct and the first is not. Directivity falls only from 1.64 to 1.5, a difference of less than half a decibel, whereas radiation resistance falls from about 73 ohms to a few ohms or less, which is what destroys the efficiency. The pair is worth holding together because it locates the real penalty of making an antenna small: not the pattern, but the loss and the bandwidth.
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