Microchip Technology R30M User Manual
ATSAMR30M18A User manual
RF Trace Layout Design Instructions
The ATSAMR30M18A module transmitter is certified with
1. A SMA
(1)
connector and micro strip layout
2. On-board chip antenna and micro strip layout
This section describes the PCB stack up, mechanical details of the PCB trace leading up to SMA
connector for case 1 and up to chip antenna for case 2. The host PCB can follow these trace design to
maintain compliance under the modular grant(FCC) and certificate(IC). Schematics, BoM, Layout source
files and Gerber files are available for download on the SAMR30M18A product web page.
Below is a snapshot of the schematic diagram for the host board showing the RF frontend. For case 1,
R115 will be populated and L106 will be not populated. For case 2, L106 will be populated and R115 will
be not populated.
Note:
(1) If the host board of ATSAMR30M18A is designed to have an antenna port that is accessible
to the end-user, RP (Reverse Polarity)-SMA socket must be used.
If an RF coaxial cable is used between the module RF output and the enclosure, then an
RP-SMA connector must be used in the enclosure wall for interface with antenna.
Trace layout dimensions:
Trace width – 0.22 mm
Trace gap – 0.42 mm
Finished copper weight – 1 ounce
Layout of Trace design:
Below figure shows the Top layer routing of the complete reference board.
Below figure shows the Top layer layout of the reference host board focussed on RF traces. The
snapshot also indicates the critical dimensions that are required to be replicated in the design to
maintain compliance.
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