4don MSN
This QR code is the smallest in the world and can 'only be recognised with an electron microscope'
You don't happen to have a microscopic phone camera yet, do you?
Abstract: To compensate the energy loss of traditional passive space-time-coding metasurface, an amplifying space-time-coding metasurface (ASTCM) is proposed in this work. The ASTCM can achieve more ...
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