Although the fundamental absorbing mechanism of waveform-selective metasurfaces is fully described
elsewhere23,24, waveform selectivity is realized in the following manner. The metasurfaces are composed of periodic
conducting square patches (copper, 17× 17mm2
with minor crops) and ground plane (PEC, namely, perfect
electric conductor) as well as a dielectric substrate (Rogers3003, 1.5 mm thickness) in between. Additionally,
several circuit components are deployed between the conducting patches as illustrated in the left of Fig. 2 (see
blue and green). Under these circumstances a set of four schottky diodes (Avago HSMS-2863/2864, blue here)
plays the role of a diode bridge. For this reason an incoming wave induces electric charges on each patch, which
are fully rectified to an infinite set of frequency components but mostly to zero frequency. This energy flow is
controlled by exploiting the time-domain responses of capacitors and inductors (the green in the left of Fig. 2), i.e.
capacitors store the energy and gradually build up their electric potentials, while inductors block the incoming
energy due to the presence of electromotive force during an initial time period.