User Guide

3. The PI-type matching circuit for adjusting the impedance of the module is placed close to
the module. The PI type matching circuit for matching the antenna is placed close to the
antenna.
FIG 14 The PI type matching circuit Layout
FIG 15 The RF line Layout
Motherboard interference comes from: high-speed data interface (HDMI), the Operating
frequency of main chip, DDR, DC-DC power supply. The method of avoiding interference
according to the characteristics of various signals is also different. The main methods of
interference avoidance include :
1. keeping away from the source of interference;