Where Can I Find a Passive RFID Sensor that Would Tell Me if Something Were Touching It?

By RFID Journal

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Ask The ExpertsWhere Can I Find a Passive RFID Sensor that Would Tell Me if Something Were Touching It?
RFID Journal Staff asked 4 years ago

I would need it to just return a value of 1 if it were touching something, or zero if were not. I would also need it be small and thin, with a short read range. What would you recommend?

—Ryan

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Ryan,

I am unaware of anything that would meet your specified needs. There are passive RFID sensors that can detect temperature, pressure and moisture levels, but I don’t know of any sensor that could detect whether or not something was touching it.

RFMicron makes a chip that can detect changes in an antenna’s impedance. This could be used to detect if things touch the antenna, because items with a high enough dielectric constant would change the impedance. But if something with a low dielectric constant (dry cardboard, for instance) were to touch the antenna, this could not be detected.

—Mark Roberti, Founder and Editor, RFID Journal

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