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- Tag is too far from the reader
- Tag is placed on a surface it was not intended for
- Reader signal is blocked by an object between the reader and the tag
- Reader signal is being reflected off an object or flat surface
- For fixed readers, the cable connecting the reader and antenna is loose
- Reader transmit power is not set to the maximum level
- Reader antenna is not aimed at the tag
- Reader is not set for the correct region, e.g., ETSI instead of FCC
- Dynamic range of the sensor is exceeded, especially in the case of moisture sensors
- With software that supports registering sensors, trying to read unregistered tags can give the appearance of a read failure
- All antennas have a pattern of blind spots, called nulls, and so pointing the reader into a null can lead to read failure or greatly reduced read range
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RFMicron 11 months ago.
