Magtek DynaWave Installation And Operation Manual page 26

3 - Mechanical Integration
In addition, if the enclosure contains ferromagnetic material such as steel, the solution design team must
carefully consider the enclosure's radio frequency (RF) absorbing effects on NFC contactless
performance. The device must protrude from such a mounting panel as much as possible (see Figure 3-4)
to avoid adverse effects on NFC communication range. For example, assuming a flat sheet steel panel,
the panel thickness should not exceed 0.25 in. (6.5mm). Designers may also wish to consider hybrid
designs that use a larger cutout and a "surround" of non-ferromagnetic material such as plastic, which
further decouples the device from RF absorbing effects of the mounting panel.
Figure 3-4 - DynaWave Protrusion from Panel
Further, if the area around the device includes any protrusions beyond the plane of the mounting panel
that contain ferromagnetic material (such as privacy shields or weather shields, or a recessed sheet metal
panel design like Figure 3-5), those protrusions may also affect NFC performance, and the solution
design should include adequate clearance distances between those features and the device.
Figure 3-5 - DynaWave Protrusion Clearance Example
DynaWave| OEM Contactless NFC Module | Installation and Operation Manual
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