Example Applications - RFID: Fundamentals and Applications in Contactless Smart Cards and Identification - page 355

Figure 13.22 Size comparison of different variants of electronic animal identification transpon-
ders: collar transponder, rumen bolus, ear tags with transponder, injectible transponder (repro-
duced by permission of Dr Michael Klindtworth, Bayrische Landesanstalt fur Landtechnik,
Freising)

Injectible
transponder

Ear tag

Bolus

Collar transponder

Figure 13.23 The options for attaching the transponder to a cow

The implant is in the form of a glass transponder of 10, 20 or 30mm in length
(Figure 13.25). The transponder is supplied in a sterile package or with a dose of
disinfectant. The dimensions of the glass transponder are amazingly small, considering
that they contain the chip and a coil wound around a ferrite rod. A typical format is
23 . 1mm

×

3 . 85mm (Texas Instruments, 1996).