Fig. 1. Schematic of SWIPT based on the ASTCM under the excitation of a transmitter. The reflected waves form two beams for energy and information transmission, respectively, by tuning the phase states of the meta-atoms.

Fig. 2. Time-domain waveforms and amplitude spectra of the reflection coefficient with different bit width: (a), (b) 1-bit, (c), (d) 2-bit, and (e), (f) 3-bit.

Fig. 3. Schematic of the 3-bit meta-atom, in which the substrate is sandwiched by two patches bridged by a varactor diode and a PEC ground. Different coding states can be obtained by changing the biasing voltage of the varactor diode.

Fig. 4. Schematic of directional power transfer and omnidirectional information transmission under spatial-division multiplexing strategy.

Fig. 5. (a) Spectral distribution of fundamental and +1st-order harmonic. (b) Constellation diagram measured at +1st-order harmonic for QPSK modulation scheme.

Fig. 6. Experimental demonstration of SWIPT based on the proposed architecture.