In this paper, measurement techniques of absorbing ability for a RAM were studied for RCS Reduction needed for materializing ADD's RF stealth. As for the measurement techniques of absorbing ability, the theories of the free space method, similar to real radar system, and transmission line method, suitable for lab scale, were established. And we made real RAM samples, measured absorbing ability according to each, and compared the results. After comparison, electromagnetic(EM) wave absorbing ability was measured to be somewhat superior in free space method and overall uniform pattern was observed. Therefore, by applying measurement techniques by stage and by frequency we could develop RAM in a more efficient way. 키워드 자유공간법, 전송선로법, 흡수능, RAM, RCS 감소
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