User's Manual

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User Manual
3. RF Specifications
3.1. RF connections
The M18Q2 has three RF pads; developers may connect them via 50 Ω traces to the main board.
ANT0_TRX pad (Pin15) – Primary RX/TX path
ANT1_DRX pad (Pin21) – Diversity path
ANT_GNSS pad (Pin9) – GNSS path (optional)
3.2. RF Layout guidance
It is recommended that grounds not be present under the surface of the RF pads in the layout. Details
are included below.
Layer1
Layer2
Layer3
0.5mm
0.5mm
GND
GND
GND
Pin9
Pin15
Pin21
The RF trace between RF pads and antenna should as shorter as possible with 50ohm characteristic
impedance.