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Space-Frequency Metasurface for Frequency and Function Multiplexing
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DOI：10.1002/adom.71838.png)
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Abstract
En 中文
Electromagnetic (EM) metasurfaces offer powerful capabilities to manipulate wave properties across multiple dimensions, including amplitude, phase, and polarization. However, achieving efficient multi-frequency multiplexing remains a significant challenge due to system complexity and costs. For instance, while space-time metasurfaces facilitate frequency-domain control through time-domain modulation, they often suffer from prohibitive power consumption, complex control circuitry, and substantial hardware overhead. Here, inspired by the modular assembly of interlocking building blocks, we propose a space-frequency metasurface paradigm for frequency multiplexing. By introducing spatial sparsity and geometric periodicity as novel degrees of freedom, low-complexity and cost-effective multi-frequency multiplexing can be achieved. Our investigation reveals that the EM performance of the metasurface exhibits robustness against array thinning, thereby liberating spatial capacity to interleave heterogeneous meta-atoms with distinct periodicities. Governed by their distinct spatial periodicities, these dimensionally scaled meta-atoms are engineered to independently regulate multiple frequency bands with low inter-frequency crosstalk. To demonstrate the versatility of this platform, we implement an integrated sensing and communication platform, achieving simultaneous wireless data transmission and non-contact vital sign monitoring. It provides a template for the development of multifunctional EM materials and establishes a robust conceptual foundation for the cross-disciplinary fusion of materials science and modern information technologies.
Keywords:
integrated sensing and communication
metasurface
space-frequency multiplexing
sparsity
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