User Manual

Stereo Module

2015 Microchip Technology Inc.
Page 24
P
reliminary
Edition
4.2 MODULE PLACEMENT RULE
On the main PCB, the areas under the antenna should not contain any top, inner layer, or
bottom copper as shown in Figure 4‐1. A low‐impedance ground plane will ensure the best radio
performance (best range, lowest noise). The ground plane can be extended beyond the minimum
recommended as need for the main PCB EMC noise reduction. For the best range performance,
keep all external metal away from the ceramic chip antenna at least 15 mm.
Here are some examples of good and poor placement on a carrier board with GND plane.
FIGURE 4-3: MODULE PLACEMENT EXAMPLES
FIGURE 4-4: GND PLANE ON MAIN APPLICATION BOARD