Reference Design Of Rf Layout - Quectel EG91 Series Hardware Design

NOTE
1. An external LDO can be selected to supply power according to the active antenna requirement.
2. If the module is designed with a passive antenna, then the VDD circuit is not needed.

5.3. Reference Design of RF Layout

For user's PCB, the characteristic impedance of all RF traces should be controlled to 50 Ω. The
impedance of the RF traces is usually determined by the trace width (W), the materials' dielectric constant,
the height from the reference ground to the signal layer (H), and the spacing between RF traces and
grounds (S). Microstrip or coplanar waveguide is typically used in RF layout to control characteristic
impedance. The following are reference designs of microstrip or coplanar waveguide with different PCB
structures.
EG91_Series_Hardware_Design
Figure 32: Microstrip Design on a 2-layer PCB
Figure 33: Coplanar Waveguide Design on a 2-layer PCB
LTE Standard Module Series
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