User's Manual

Smart Machine Smart Decision
SIM7020G_User Manual_V1.00 37 2019-01-15
2300MHz-2650MHz
<1.2dB
To facilitate the antenna tuning and certification test, a RF connector and an antenna matching circuit
should be added. The following figure is the recommended circuit.
Figure 24: Antenna matching circuit (MAIN_ANT)
In above figure, the components R1, C1, C2 and R2 are used for antenna matching, the values of
components can only be achieved after the antenna tuning and usually provided by antenna vendor.
By default, the R1, R2 are 0Ω resistors, and the C1, C2 are reserved for tuning. The component D1 is
a TVS for ESD protection, and it is optional for users according to application environment.
The RF test connector is used for the conducted RF performance test, and should be placed as close
as to the module’s MAIN_ANT pin. The traces impedance between SIM7020G and antenna must be
controlled in 50Ω.
Two TVS are recommended in the table below.
Table 27: Recommended TVS
Package
Part Number
Vender
0201
LXES03AAA1-154
Murata
0402
LXES15AAA1-153
Murata
4.3 RF traces note
4.3.1 RF traces layout
➢ Keep the RF trace from module ant pin to antenna as short as possible
➢ RF trace should be 50 Ω either on the top layer or in the inner layer
➢ RF trace should be avoided right angle and sharp angle.
➢ Put enough GND vias around RF traces.
➢ RF trace should be far away from other high speed signal lines.