Main And Rx-Diversity Antenna Interfaces Reference Design; Reference Design Of Rf Layout - Quectel SC200L-EM Hardware Design

LTE-TDD B38
LTE-TDD B39
LTE-TDD B40
LTE-TDD B41
NOTE
"*" means under development.

6.1.1 Main and Rx-diversity Antenna Interfaces Reference Design

A reference circuit design for main and Rx-diversity antenna interfaces is shown as below. A π-type
matching circuit should be reserved for better RF
(R1/C1/C2, R2/C3/C4) should be placed as close to the antennas as possible and are mounted
according to the actual debugging. The C1, C2, C3, and C4 are not mounted and a 0Ω resistor is
mounted on R1 and R2 respectively by default.
Figure 27: Reference Circuit Design for Main and Rx-diversity Antenna Interfaces

6.1.2 Reference Design of RF Layout

For user's PCB, the characteristic impedance of all RF traces should be controlled to 50Ω. The
impedance of the RF traces is usually determined by the trace width (W), the materials' dielectric constant,
SC200L_Hardware_Design
2570~2620
1880~1920
2300~2400
2496~2690
SC200L Hardware Design
2570~2620
1880~1920
2300~2400
2496~2690
performance. The π-type
MHz
MHz
MHz
MHz
matching components
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