Reference Design Of Rf Antenna Interface; Gnss Antenna Interface - Quectel RM502Q-GL Hardware Design

n78 3300–3800

5.1.4. Reference Design of RF Antenna Interface

A reference design of antenna interface is shown as below. A π-type matching circuit should be reserved
for better RF performance. The capacitors are not mounted by default.
NOTES
Keep the characteristic impedance for antenna trace as 50 Ω.
1.
π-type
2. Place the matching components as close to the antenna as possible.
3. Digital circuits such as (U)SIM card, USB interface, camera module, display connector and SD card
should be kept away from the antenna traces.
4. Keep 75 dB PCB isolation between two antenna traces.
5. Keep 15 dB isolation between
6. It is suggested to keep 20 dB isolation between 5G NR UL MIMO Tx0 and Tx1 antennas.

5.2. GNSS Antenna Interface

The following table shows frequency specification of GNSS antenna connector.
RM502Q-GL_Hardware_Design
3300–3800
Module
ANT0
ANT3
Figure 30: Reference Circuit of RF Antenna
each antenna to improve the receiving sensitivity.
RM502Q-GL Hardware Design
– –
R1 0Ω
C1 C2
NM NM
R4 0Ω
C7 C8
NM NM
5G Module Series
–
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