User's Manual

EH-MC30
Ehong
®
Professional Bluetooth Solutions Provider page 13 of 17
7. Reference Design
Figure 10： Reference Design
8. Layout Guidelines
For optimal performance of the antenna place the module at the corner of the PCB as shown in
the figure 3. Do not place any metal (traces, components, battery etc.) within the clearance area
of the antenna. Connect all the GND pins directly to a solid GND plane. Place the GND via as
close to the GND pins as possible. Use good layout practices to avoid any excessive noise
coupling to signal lines or supply voltage lines. Avoid placing plastic or any other dielectric
material closer than 6 mm from the antenna. Any dielectric closer than 6 mm from the antenna
will detune the antenna to lower frequencies.
Figure 11： Clearance area of antenna