Reference Design Of Rf Antenna Interface - Quectel RM500Q-AE Manual

B26 814–849
WCS 2305–2315
B38 2570–2620
B41/B41-XGP 2496–2690
B48 3550–3700
B66 1710–1780
B71 663–698
n77 3300–4200

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.
Figure 26: RM500Q-AE&RM502Q-AE Reference Circuit of RF Antenna
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
RM500Q-AE&RM502Q-AE_Hardware_Design
RM500Q-AE&RM502Q-AE Hardware Design
859–894 B26
2350–2360 B30
–
2570–2620
–
2496–2690
–
3550–3700
2110–2200 B66
617–652 B71
–
3300–4200
each antenna to improve the receiving sensitivity.
5G Module Series
– –
– –
–
B38
–
B41
–
B48
– –
– –
– –
–
–
n38
n41
-
n66
n71
n77
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