Passive tags are those energized by the reader itself, they contain no power source, typically have very long lifetimes (near indefinite) a drawback over active tags is the read range, typically 2cm (1in) to 1.5m (4.5 ft), a strong positive is individual tag cost.

The reader powers the tag (transponder), by emitting a radio frequency wave. The tag then responds by modulating the energizing field. This modulation can be decoded to yield the tags unique code, inherent in the tag. The resultant data can be the passed to a computer from processing.

Tags have various salient features apart from their physical size: Other available features are: Read Only, Read Write, Anti-Collision.

 SHORT RANGE RO PRODUCTS.

Non-programmable onboard memory-

Portola Family

 Glass Sealed Package

 Keyfob

 PCB compatible brick

 Bulk Metal Tag

 "Nail"

 Epoxy and PET Discs

 Garment and Laundry Discs

 Credit Cards (Photoprintable with and without magnetic stripe)

Programmable onboard memory-

Pioneer Family: 32 bit RO, 256 byte RW, Anticollision

 Epoxy and PET Discs

Also available in credit card formats

Vallejo Family: 32 bit RO, 32 byte RW

 Epoxy and PET Discs

Also available in credit card formats

 Carillo Family

 Low cost read write label tags for high volume applications, libraries, retail, etc.

600mm or further

 Credit Card and Half Credit Card

 Window Mount (Highway Toll Collection)

 Metal Mount Tag

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