Quectel SC20 Series Hardware Design page 85

Smart Module Series
Figure 36: Coplanar Waveguide Design on a 2-layer PCB
Figure 37: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground)
Figure 38: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground)
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