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Monostatic RCS at zero incidence. Green curve: exact computation for the periodically grooved PEC sphere. Blue curve: EMA0 or εz = 5, εr = εφ = –∞, μr = μφ = μz = 1. Red curve: EMAμ or εz = 5, εr = εφ = –∞, μr = μφ = 0.2, μz = 1.
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