Allflex AFX-100 Manual do Utilizador descarregar pdf (Página 8)

Rev Australasia V2.3 12/04

8 8

The wire is then laid over to the other edge of the structure, where a second loop is wound. This

loop is at the edge where the animal will exit the structure. Therefore the animal will walk

through 2 loops formed from one single conductor. The start of the wire and end of the wire

terminate at an electrical connector to allow circuit connection to the control electronics.

The first coil and second coil are wound in opposite directions (out of phase). This increases

immunity to electrical noise.

The antenna structure is located between metal pipes section around 1 metre long that run in a

horizontal plain. These can simply be sections of metal gates. Ensure they are very firmly

fastened so that vibration of the metal is not evident.

These pipes act as radiators to expand the antenna read field. The metal bars also allow better

coupling with the tag when in a horizontal plain. Many sheep RFID tags sit in a horizontal plain

and for a simple panel antenna this is the worst orientation. However, in the portal reader, the

effects of tag orientation are essentially removed because of the metal radiators and the fact that

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Allflex AFX-100 Manual do Utilizador Página 8