Pcb Layout Considerations Of Coplanar Waveguide - Quectel EC2 Series Design Manualline

Figure 34: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground)
Figure 35: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground)

3.11.3. PCB Layout Considerations of Coplanar Waveguide

There are 6 guidelines of the PCB layout should be taken into consideration. Each guideline is
corresponding to the marks in the following two figures respectively.
1. Control the trace width (W) and the spacing between RF traces and grounds (S) corresponding to the
50 Ω coplanar waveguide. Taking common PCB board with FR4 medium (dielectric constant 4.2) and
copper thickness of 35 μm as an example, the W and S corresponding to the thickness between
different signal layers and reference grounds are shown in Table 2. It is particularly reminded that
PCB manufacturers need to control the accuracy of the W and S.
2. Fully contact the GND pin pad next to the RF trace with ground plane and not design it as design
thermal relief pad.
EC2x&EG2x-G_Series_PCB_Design_Guideline
LTE Standard Module Series
EC2x&EG2x-G Series PCB Design Guideline
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