Discussion
Why are lens antennas often zoned or stepped?
Answer: D
Removing whole wavelengths of path from the thickest parts cuts weight and material dramatically, since only the fractional part of the delay matters. The price is that the correction is exact only at the design frequency, so the bandwidth narrows and shadowing occurs at the steps. Tolerance, dual band operation and side lobe control are not what zoning achieves. It is a clear case of a technique whose whole justification is mechanical and whose whole cost is electrical.
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