
6.3 Effect of Plastic and Metal Materials
The antenna on the BGM13S is insensitive to the effects of nearby plastic and other materials with low dielectric constant. No separa-
tion between the BGM13S and plastic or other materials is needed. The board thickness does not have any impact on the module ei-
ther.
Any metal within the antenna area or in close proximity to the antenna area may detune the antenna. In this case it is possible to retune
the antenna by adjusting the width of the antenna loop. To avoid detuning of the antenna, the minimum distance to any metal should be
more than 3 mm. Encapsulating the module inside metal casing will prevent the radiation of the antenna.
Figure 6.5 Antenna Tuning on page 70
shows how it is possible to adjust the frequency of the antenna by adjusting the width of the
antenna loop. The antenna is extremely robust against any objects in close proximity or in direct contact with the antenna and it is rec-
ommended not to adjust the dimensions of the antenna area unless it is clear that a metal object, such as a coin cell battery, within the
antenna area is detuning the antenna.
Figure 6.5. Antenna Tuning
6.4 Effects of Human Body
Placing the module in contact with or very close to the human body will negatively impact antenna efficiency and reduce range.
BGM13S Blue Gecko
Bluetooth
®
SiP Module Data Sheet
Layout Guidelines
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