AN2972

From design to production

Doc ID 15629 Rev 6

23/25

Figure 26. Impact of housing/packaging material on RF communication

Process flow

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Design:

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Hint: check the device datasheet.

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Hint: use the simplified models in this application note or other more sophisticated

models developed in the RF literature.

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Define the antenna dimensions.

–

Compute the theoretical antenna design and layout.

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Prototyping

–

Define an antenna matrix with different values centered around the targeted

Hint: select 6 to 10 antennas with inductances that vary around L

of 5 %.

–

Fabrication of the antennas and M24LRxx mounting.

For each prototype:

–

Measure the antenna’s tuning frequency.

–

Measure the read range with all types of selected RFID readers.

–

Measure the read range in configurations close to the actual product usage.

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Industrialization

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Characterize the tuning frequency dispersion on a significant number of samples.

–

Measure the read range of the lowest and highest tuning frequency boards with

various readers and in the various configurations.

–

variation.

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Production

–

Process monitoring

ai17301

Dual interface EEPROM

Nonconductive housing:

RF communication OK

Conductive housing:

no RF communication