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Layout Guidelines
Figure 15. Top Layer – Antenna and RF Trace Routing Layout Guidelines
Figure 16. Bottom Layer – Antenna and RF Trace Routing Layout Guidelines
Table 4
describes the guidelines corresponding to the reference numbers in
Figure 15
and
Figure 16
.
Table 4. Antenna and RF Trace Routing Layout Guidelines
Reference
Guideline Description
The RF trace antenna feed must be as short as possible beyond the ground reference. At this point, the trace
1
starts to radiate.
RF trace bends must be gradual with an approximate maximum bend of 45 degrees with trace mitered. RF
2
traces must not have sharp corners.
3
RF traces must have via stitching on the ground plane beside the RF trace on both sides.
4
RF traces must have constant impedance (microstrip transmission line).
For best results, the RF trace ground layer must be the ground layer immediately below the RF trace. The
5
ground layer must be solid.
6
There must be no traces or ground under the antenna section.
15
SWRU382 – November 2014
WL1837MODCOM8I WLAN MIMO and Bluetooth
®
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for TI Sitara™ Platform
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