ABSTRACT The radiation‐reflection‐integrated metasurface (RRIM) has emerged as a promising platform for advancing information science and integrated electronic systems by enabling joint control of both radiated and reflected waves. However, existing RRIMs are largely limited to half‐space modulation of the radiation mode (RA‐mode) and reflection mode (R‐mode), with the two modes typically operating under a time‐division scheme across the spectrum. Although mode multiplexing of radiation reflection has been realized, it has not led to a commensurate improvement in system throughput or spectral efficiency. Here, we present a full‐space radiation‐reflection‐integrated metasurface (FRRIM) system realizing independent and simultaneous control of in‐band quad RA‐and R‐modes. The FRRIM is constructed by the structure‐reused circular‐polarization‐sensitive meta‐atom based on hybrid phase mechanisms and the integration design of feeding strip‐line as well as coupling slots. For validation, a FRRIM prototype is designed and fabricated to illustrate the potential of FRRIM for applications in simultaneous transmit and receive communication systems, radar stealth, and full‐space multiplexing holographic devices. The proposed FRRIM configuration, when incorporated into highly integrated systems, achieves a quadrupling of spectral efficiency and a tripling of system throughput, thereby enabling more flexible resource allocation and significantly enhancing the performance of electronic systems.
Pang et al. (Sun,) studied this question.
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