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cv 賰鬲丕亘丞 丕賱爻賷乇丞 丕賱匕丕鬲賷丞 sng mng dps eng dng metamaterial application surface plasmon spr plasmon dng materials lhd medium metamaterials srr pyramidal feed-horns sectoral e-plane horns sectoral h-plane horns waveguide horn antenna zeros poles closed loop poles control