Transmission rfid test systems
AssigneeAvery Dennison Retail Information Services LLC
InventorsIan J. FORSTER, Adrian N. FARR
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Abstract
An RFID test system is disclosed that establishes a minimum coupling between two ports without an RFID tag present and a higher coupling when the RFID tag is present. Furthermore, this controlled coupling in the presence of an RFID tag is used to read and identify tags. The RFID tag is read when it is in the coupling zone, as it receives maximum power and has the lowest loss path to the receiver. Adjacent tags do not couple efficiently, so they are isolated from the wanted device (i.e., RFID tag). Further, the coupling through the RFID tag can be frequency specific, and the peak frequency can be determined. This peak frequency and also the amount of coupling can give a good indication of a number of aspects of the tag assembly.
Claims19
A magnetic RFID test system, comprising:
- a first transmit loop;
- and
- a second receive loop;
- and
- wherein coupling between the first loop and the second loop is dependent on the inverse cube law for distance but also the cosine of a relative angle between the coils;
- and
- wherein the relative angle between the first loop and the second loop is 90 degrees so coupling is at a minimum.
An electrical RFID test system, comprising:
- a first dipole;
- and
- a second dipole;
- and
- wherein long directions between the first dipole and the second dipole is 90 degrees so coupling is at a minimum.
An electrical to magnetic RFID test conversion system, comprising:
- a first short dipole which is an electric field emitter that creates a near electric field with minimum magnetic field associated with it;
- and
- a first receive loop which is a magnetic field receiver;
- and
- wherein coupling between the first dipole and the first loop is low.
Dependencies are inferred from the claim text.