Is there a wide variance in read range?
All passive HF RFID readers contained in smartphones offer about the same read range. The readers employ the Near Field Communication (NFC) protocol, which is based on the ISO 14443 standard. This protocol requires a short read range since it is used for financial transactions. The limited read distance of a few inches reduces the chance of the tag-to-reader communication being interrupted. The NFC protocol also incorporates the ISO 15693 air-interface protocol, which allows for a longer read range, but the distance is limited by the size of the reader antenna. Since these readers are packed into a phone with a limited real estate, all have a small antenna and thus a very limited read range.
—Mark Roberti, Founder and Editor, RFID Journal
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