Shanghai SIMCom Wireless Solutions Limited 180302009 User Manual
SIM5320AL Document
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5. Antenna interface
SIM5320AL 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.The maximum gain of the GSM antenna gain should not exceed 3dBi considering the
SAR radio. No antenna gain may be used that would exceed the 2W EIRP power limit in 1900MHz band.
SIMCom recommends that the total insertion loss between the antenna pad and antenna should meet the
following requirements:
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.The maximum gain of the GSM antenna gain should not exceed 3dBi considering the
SAR radio. No antenna gain may be used that would exceed the 2W EIRP power limit in 1900MHz band.
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.
Figure1: antenna matching circuit
In this figure, the components L101,C101,C102 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 L101 is 0 ohm
resistors, and the C101, C102 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.
be got after the antenna tuning, usually, they are provided by antenna vendor. By default, the L101 is 0 ohm
resistors, and the C101, C102 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.