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Hitachi‘s µ-chip (pronounced “mu-chip”) measures 0.15 millimeter in length by 0.15 millimeter in width and has a thickness of 7.5 micrometers (see Hitachi Unveils Smallest RFID Chip, Hitachi Unveils Integrated RFID Tag and Hitachi Shrinks Smallest RFID Chip). The chip transmits data at 2.45 GHz and has a memory capacity of 128 bits of data, which cannot be overwritten. The read range for the chip, however, is just a few millimeters, because the antenna is right on the chip and is so small that not enough energy can be reflected back to the reader from farther distances.
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Would a More Efficient Chip Increase a Tag’s Read Range? »