Near-Field UHF RFID Systems

A company seeks a near-field ultra-high-frequency (UHF) RFID system solution that can communicate in near-field while keeping the field region localized so that far-field talks can be suppressed. A new near-field UHF RFID reader antenna is sought that has strong magnetic near-field, but small far-field gain and beam width. The antenna size should be as small as possible. A second option would be a UHF solution with assisting devices that could guarantee a localized read field. The tags in the interesting field could be read reliably without field nulls. The cross-reading for the tags outside the interesting field could be avoided.

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