User Guide

If using the SMD package, the RF port impedance must be offset after the module is
soldered to the motherboard. In order to achieve the best performance,, it is recommended to
add a PI-type matching network to the motherboard, as shown below (C11, R21,C6). The value of
the PI type matching network needs to be debugged according to the actual motherboard to
match RF port impedance to 50 Ohm.
FIG 12 Connect 50 Ohm matching antenna reference circuit
The antenna ANT1 in the figure above must be 50 Ohm. If the antenna is not matched, it is
recommended to add a set of PI type matching network at the front of the antenna to match the
antenna. Generally, the antenna manufacturers will give Suggestions on matching parameters.
FIG 13 Connect the unmatched antenna reference circuit
The RF line layout should be matched according to 50ohm. The line impedance is related to
the plate, plate thickness, line width and copper spacing. Professional software can be used to
calculate the line width. Note: for multilayer plates, the plate thickness should calculate the
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.