We report a novel dual-band metasurface structure to harvest electromagnetic energy in the environment efficiently. The unit structure comprises the complementary improved Jerusalem cross on F4B substrate, a centrosymmetric structure exhibits excellent stability under different polarization and incidence angles at ISM band (2.45GHz and 5.8GHz). Numerical simulation validates that the dual-band, polarization-insensitive and wide-angle energy harvesting of the metasurface array constructed by the composite structure. The energy harvested by the array is guided to the back side through the designed metallic vias and collected by the dual-band differential input power combiner. The experimental results demonstrate that the metasurface array can achieve the peak energy harvesting efficiency of 91.6% and 94.9% under TE and TM polarization.

A dual band-notched reconfigurable dielectric resonator antenna (DRA) is proposed in this paper. A rectangular dielectric resonator excited by stepped offset microstrip feedline generates multiple resonant modes for wideband performance. Moreover, the typical stepped impedance feedline and partial ground plane with one rectangular notch are adopted for contributing for better impedance matching. On this basis, a five-line coupler resonator (FLCR) composed by inverted U-shaped and 山-shaped structures is introduced as a bandstop filter in the microstrip feedline, and dual rejected bands are created. Tunable notched frequencies are achieved by the varactor between these two structures. The proposed antenna size is 24 × 28 × 5.637 mm3. For the presented work, both simulated and measured results for the proposed tunable antenna ranging from 5.3 to 5.84 GHz and from 8.74 to 8.98 GHz within the wide bandwidth of 6.06 GHz are presented, demonstrating the accuracy of this design. There capabilities make the proposed antenna applicable for wideband systems with the requirement of avoiding interferences.