Specifications

Module：EWN-8822CSS3AH
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distance from RF routing layer to GND of the next layer. There are RF lines Layout principles :
1. RF line layout needs to match 50 ohms. The line width can be calculated by professional
software. (Note: If it is a multi-layer board, The board thickness should calculate the distance
from the RF trace layer to the next ground layer.)
2. The RF line must be surrounded by ground copper and ground holes.
3. The PI-type matching circuit for adjusting the impedance of the module is placed close to
the module. The PI type matching circuit for matching the antenna is placed close to the
antenna.
FIG 19 The PI type matching circuit Layout
FIG 20 The RF line Layout