SimCom SIM5320AL User Manual page 52

less than 2.
SIMCom recommends that the total insertion loss between the antenna pad and antenna should meet the
following requirements:
WCDMA 1900<0.9dB
●
WCDMA 850<0.5dB
●
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.
In this figure, the components R1,C1,C2 and R2 is used for antenna matching, the value of components
can only be got after the antenna tuning, usually, they are provided by antenna vendor. By default, the R1,
R2 are 0 ohm resistors, and the C1, C2 are reserved for tuning.
The RF test connector in the figure is used for the conducted RF performance test, and should be placed as
close as to the module's antenna pin. The traces impedance between components must be controlled in
50ohm.
SIM5320AL_User Manual_V1.01
Figure 39: Antenna matching circuit
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Smart Machine Smart Decision
2014-08-20