User's Manual

10.RF Design Guide
Correct RF design is essential for RF performance such as transmitting power, receiving
sensitivity and harmonics. Following this RF design guide could benefit to improve the RF
performance of customer’s product.
10.1. Recommended Impedance Matching Circuit
The impedance of M10’s RF_ANT port is 50Ω. If the impedance of antenna is close to 50Ω in all
working frequency bands, the antenna could be connected to the RF_ANT port directly via 50Ω
transmission line. But if the impedance of antenna is not close to 50Ω, a T-type or π-type
matching circuit should be inserted between transmission line and antenna. The matching
components should be placed as close as possible to the antenna’s feed point.
Figure 6 and Figure 7 show the reference designs of T-type and π-type matching circuits.
Figure 6: T-type matching circuit
Figure 7: π-type matching circuit