Users Manual
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The module provides four antenna interfaces: MAIN antenna, DRX antenna, GPS antenna and WiFi/BT
antenna. In order to ensure that the user's products have good wireless performance, the antenna
selected by the user should meet the requirement that the input impedance is 50 ohms in the
working frequency band and the VSWR is less than 2.
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The module provides the MAIN antenna interface pin Pin1 RF_MAIN. The antenna on the user's main
board should be connected to the antenna pin of the module using a 50-ohm characteristic microstrip
line or strip line.
In order to facilitate antenna debugging and certification testing, an RF connector and antenna
matching network should be added. The recommended circuit diagram is as follows:
Figure 4.33: MAIN Antenna Interface Connection Circuit
In the figure, R101, C101, and C102 are antenna matching devices, and the specific component values
can be determined after the antenna factory debugs the antenna. Among them, R101 defaults to 0R,
C101 and C102 do not paste by default.
If there are fewer components between the antenna and the module output, or if the RF test head is
not needed in the design, the antenna matching circuit can be simplified as shown below:
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