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LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 73 / 100
5.3. 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,
height from the reference ground to the signal layer (H), and the clearance 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.
Figure 35: Microstrip Design on a 2-layer PCB
Figure 36: Coplanar Waveguide Design on a 2-layer PCB