Discussion
What is the first side lobe level of a uniformly illuminated circular aperture?
Answer: B
The circular case gives minus 17.6 decibels, appreciably better than the rectangular aperture's 13.2, because the circular geometry effectively tapers the illumination towards the edges in one dimension. Reaching minus thirty decibels requires deliberate amplitude tapering and costs beamwidth and efficiency. The figure of minus six corresponds to nothing standard. These two numbers, 13.2 and 17.6, are the reference points against which any measured side lobe level should first be compared.
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