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Cheap Chips Herald Future of Wave and Pay

Wave and pay

Credit: Josep Lago/AFP/Getty Images

Small, cheap smart-tag devices that are printed as digital circuits in rolls like newspapers could help kickstart the wireless payment industry. The devices, known as rectennas, combine a rectifier—which converts current from AC to DC—with an antenna, and can harness power directly from radio waves given off by a mobile phone.

From New Scientist
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