History of engineering & technology UHF-RFID active control common-mode noise corrugated ground plane differential signaling dual-band dual-band polarization converters electromagnetic bandgap electromagnetic distortion encoder epsilon-negative material evanescent field tunneling fractals graphene left-handed line linear to circular polarization converter metal hole arrays (MHA) metamaterial metamaterials metasurfaces microwave absorbers mu-negative material phase shift sensors split-ring-resonators spoof surface plasmon polariton (SSPP) stepped impedance terahertz metamaterials transmission-based polarization conversion