Quectel FC21 Hardware Design page 31

Wi-Fi&BT Module Series
FC21 Hardware Design
Figure 13: Microstrip Design on a 2-layer PCB
Figure 14: Coplanar Waveguide Design on a 2-layer PCB
Figure 15: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground)
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