A dynamically adaptive radar absorber is described which is based on a periodic array of microstrip patches that are printed on a 500 µm-thick liquid crystal substrate. The measured reflectivity of the structure is less than −38 dB with a 200 MHz −10 dB bandwidth at 10.19 GHz when a +4 DC bias is applied. It is shown that a 34 dB reduction in signal loss occurs when the bias voltage is increased to 20 V.
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Fusco et al. (2007) studied this question.
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