To facilitate the antenna tuning and certification test, a RF connector and an antenna matching
circuit should be added.
The maximum gain of the Main antenna gain should not exceed 11dBi for LTE B2/B4
and
8dBi for LTE B5/B13 considering the SAR radio. It has according to reference trace
and matching circuit testing all FCC items, and all items satisfy FCC requirements.
Only the reference trace and matching circuit is certified,antenna design must
refer to it, any other deviations require testing Class II applications as
required by FCC.
The following figure is the recommended circuit.
Figure 27: Antenna matching circuit (MAIN_ANT)
In above figure, the components R1,C1,C2 and R2 are used for antenna matching, the value 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 Module and antenna must be
controlled in 50Ω.
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