Smart Machine Smart Decision
SIM5360_Hardware Design_V1.06
2016-11-17
57
4.3
Antenna Design Guide
SIM5360 provides RF antenna interface. Customer’s antenna should be located in the host board and
connected to module’s antenna pad through micro-strip line or other types of RF trace and the trace
impedance must be controlled in 50Ω. SIMCom recommends that the total insertion loss between the
antenna pad and antenna should meet the following requirements:
●
GSM900/GSM850<0.5dB
●
DCS1800/PCS1900 <0.9dB
●
WCDMA 2100/1900<0.9dB
●
WCDMA 900/850<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.
RF connector
R2
C1
60
MODULE
59
MAIN_ANT
GND
C2
58
GND
R1
Matching circuit
GSM/WCDMA
antenna
Figure 40: Antenna matching circuit (MAIN_ANT)
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.
SIMCOM
CONFIDENTIAL
FILE
