Importance

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Abstract

The multi-mode identification system is a short-range cooperative electronic identification system for use in the identification of fish, birds, animals, and inanimate objects. The system consists of readers and tags wherein a reader in the proximity of and inductively coupled to a tag may interrogate and obtain a response from the tag in accordance with a specified process if the tag belongs to a certain class of tags. The response consists of an identification code unique to the tag together with data supplied by sensors incorporated within the tag. Tags are minuscule in size and intended to be implanted within living tissue or concealed beneath the surface of inanimate objects. Communication between tag and reader is accomplished by a reader establishing a reversing magnetic field in the vicinity of a tag and the tag varying its absorption of power from the field in accordance with the information to be transmitted. The reader detects these variations in power absorption and extracts from these variations the information transmitted by the tag. The multi-mode reader is capable of generating a magnetic field at a plurality of frequencies and is capable of extracting information in accordance with a plurality of protocols thereby permitting the reader to be used with tags of different designs and made by different manufacturers.

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First Claim