One metamaterial emitter and one detector can replace 100 conventional antennas. Authors of this work have demonstrated that working at a single frequency and using specially designed metamaterial elements, they can create an image of a scene at microwave frequencies. The proposed imaging setup resolves previous challenges for such systems, which typically operate in a relatively broad frequency range and use expensive components. Here, the objects are illuminated by one metamaterial antenna, which is electronically switched between multiple radiation patterns at the same frequency. When detected by a second metamaterial, the knowledge of the properties of the emitter and detector antennas allows the numerical reconstruction of the 3D scene. Authors compare performance of the proposed dynamic single-frequency structure with wide-band imaging, when different emission patterns are created at different frequencies, and show that the single-frequency imaging provides comparable spatial resolution. The development of this technique paves the way for realization of low-cost and high-performance through-wall imaging, security screening, and biomedical diagnostics.
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