A Broadband Rectifying Metasurface Antenna Based on Frequency Diversity for Simultaneous Wireless Information and Power Transfer

In this letter, a broadband rectifying metasurface (RMS) antenna for simultaneous wireless information and power transfer (SWIPT) is proposed. By integrating an RMS with a slot-coupled antenna, the proposed design enables the concurrent collection of energy and information in different frequency bands, simplifying the SWIPT receiving system. First, an RMS is developed to harvest broadband electromagnetic energy across 4.4 GHz to 6.4 GHz. The top patch of the RMS unit is designed as an asymmetric orthogonal dipole, which expands the impedance bandwidth by optimizing the length ratio of its long and short arms. Rectifier diodes and inductors are directly integrated into the RMS unit to realize rectification and form direct current transmission path. Then, a 5 × 5 patch on the top of the RMS is regarded as a radiating patch, and a rectangular slot is etched in the center of the ground plane of the RMS, to form a slot-coupled antenna for information collection in the 2.4 GHz to 2.5 GHz. Measurement results indicate the energy harvesting efficiency exceeding 60% in the 4.4 GHz to 6.4 GHz, along with the gain of over 4 dBi in the 2.4 GHz to 2.5 GHz, confirming its effectiveness in both energy and information collection.