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On the optimum design of a thin absorbing screen

This paper presents an analytical study for the optimum bandwidth that a very thin absorbing screen can achieve. Our derived results are valid for an absorbing screen of arbitrary thickness, though very thin. Due to its small thickness, the single-layer screen must be capacitive for impedance matching. It is shown that a series capacitive circuit is a much better choice than the shunt capacitive one, as far as the maximum achievable bandwidth is concerned. It is also interesting to note that under certain conditions a series capacitive circuit can theoretically provide an infinite absolute bandwidth for a thin absorbing screen.