Discussion
Consider the following pairings of aperture and pattern property.
Uniform rectangular aperture - sinc pattern
Uniform circular aperture - Bessel pattern
Tapered aperture - lower side lobes
Larger aperture - wider main beam
How many of the pairs given above are correctly matched?
Answer: B
The first three are correct. A larger aperture gives a narrower beam, not a wider one, since beamwidth is inversely proportional to the aperture in wavelengths. The error is worth guarding against because it inverts the single most useful relationship in aperture antenna work, the one that connects the physical size of a structure to the angular resolution it can achieve.
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