How far can a Target be away from the Antenna?

For LINTRAN and IncOder product ranges the air gap is specified in the relevant data sheet.

More generally, it’s easiest to answer this question using a couple of examples:

Firstly, if we consider a linear Antenna 10mm wide and 100mm long in the measurement axis, then the maximum working distance of the Target from the Antenna will be about half the Antenna width i.e. 5mm. We normally recommend a stand off distance of <1/4 Antenna width – so about 2-3mm.

In a rotary example, with an Antenna whose O.D. is 50mm and an I.D. of 20mm then the equivalent Antenna width is 15mm (the thickness off the annulus). Again the maximum working distance of the Target from the Antenna will be about half the effective Antenna width i.e. 7,5mm. We would normally recommend a stand off distance of <1/4 Antenna width – so about 3-4mm.

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