5G Module Series
RG520N-AT_Hardware_Design 74 / 109
5.1.5. Reference Design
It is recommended to reserve a π-type matching circuit for better RF performance, and the π-type
matching components (like C1, R1, and C2) should be placed as close to the antenna as possible. The
capacitors are not mounted by default.
ANT0
R1 0R
C1
NM
C2
NM
R6 0R
C7
NM
C8
NM
ANT3
Module
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Figure 36: Reference Circuit for Cellular Antenna Interfaces
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5.2. GNSS
The module includes a fully integrated global navigation satellite system solution that supports GPS,
GLONASS, BDS, Galileo and QZSS.
The module supports standard NMEA 0183 protocol, and outputs NMEA sentences via USB interface
(data update rate: 1–10 Hz, 1 Hz by default).
1. Use a π-type circuit for all the antenna circuits to facilitate future debugging.
2. Keep the impedance of the cellular antennas (ANT0–ANT3) traces as 50 Ω when routing.
3. Keep at least 15 dB isolation between cellular antennas to improve the receiving sensitivity, and at
least 20 dB isolation between 5G NR UL MIMO antennas.
4. The isolation between each antenna trace on PCB is recommended to be more than 75 dB.
5. Keep digital circuits such as switch mode power supply, (U)SIM card, USB interface, camera
module, display connector and SD card away from the antenna traces.
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