User's Manual

Table Of Contents

Doc No.

Rev

1.0

Document released Date.

15/8/25

Page

Description

WM-BN-BM-26_A User Manual

2 PCB Layout Guideline

DC power

•

Use wide traces for power supply lines. Know the maximum currents being carried on

each power supply trace, and make the trace widths proportionate to the current

(especially for long trace lengths). Where possible, fill large areas with copper to

distribute the highest currents. These measures minimize IR drops, line inductance, and

switching transients.

•

Use several plated via holes to connect power supply traces between layers. The

number of vias used should be proportional to the current being routed.

•

Avoid loops in the supply distribution traces. Current-carrying loops are essentially

antennas radiating electromagnetic fields that may corrupt transceiver performance or

cause regulatory electromagnetic interference (EMI) test failures



Capacitor for power line, please close to module pin out



Isolate the supplies trace with ground



Spread out the LDO supply lines to reduce coupling

General guidelines for routing RF signals of WLAN Antenna port

RF signals require controlled-impedance lines to minimize mismatch losses and

efficiently transfer energy from source to load. The line impedance depends upon several

variables — trace width and thickness, co-planar ground spacing, height of dielectric

material between the trace and ground plane(s), and dielectric constant of the PCB

material. Given the PCB material selected, the geometry of the micro-strip, strip-line, or

co-planar grounded waveguide (CGW) elements must be designed properly to provide

the desired 50-Ω impedance. Design of micro-strip, strip-line, and CGW elements is well

documented and supported in many microwave software applications

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