What is a good loop probe to use for non contact measurements at 13.56MHz?

[acuom]

I have a receiving antenna (9 turn spiral, 1cm in diameter) that I would like to measure (inductance) wirelessly at 13.56MHz. While looking through application notes, I found that a loop probe can be used to perform a non contact measurement using a VNA. However, I couldn't find any details on what probe (name, part id or even dimensions) specifically would work for this kind of measurement. On googling, I could only find probes ranging from 30MHz to 3GHz.

Could anyone suggest a loop probe to use? Or even the dimensions of a loop that I can wind myself and connect to a coax as a last resort?

[fangfang]

Hello,

In order to better service for you. Would you please provide the information as the below?

What you mean the application note? Is the application note as the link?

URL:https://www.nxp.com/docs/en/application-note/AN12810.pdf.

Have a nice day.

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[acuom]

Hello fangfang,

Thank you for getting back to me. The application note was from Keysight, since they are the manufacturer's of our VNA.

The IC we are using is NHS3152. And the coil antenna is to connect to it. We cannot make any testing connections to it given the substrate involved so a direct connection from miniVNA/VNA would not be ideal. We need a way to wirelessly measure the resonance using a reader coil.

Regards,

Aayush Chadha

[fangfang]

Hello,

Thanks for your updated information. For the tag antenna design is difference with the reader.
You can find the tag antenna tool information as the attachment.

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