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challenges future applications missile defence air defence battlefield management fighter aircraft antennas military robots mine hunting smart soldiers aircraft defence communication 4g and 5g systems mobile communication emi/emc engineering 迟茅濒茅肠辞尘尘耻苍颈肠补迟颈辞苍蝉 active filters time invariant causality invertibility stability linearity input periodic even energy power odd opamp photolithography packaging wafer metallization ion implantation isolation diffusion oxidation epitaxy