Texas Instruments SimpleLink CC2651R3SIPA Manual page 57

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10.4.3 RF Layout Recommendations with External Antenna
When using the external antenna option, it is critical that the RF section be laid out correctly to ensure optimal
module performance. A poor layout can cause low-output power and sensitivity degradation.
the RF placement and routing of the CC2651R3SIPA module routed for use with an external SMA connector.
Figure 10-5. Module Layout Guidelines with External Antenna
Follow these RF layout recommendations for the CC2651R3SIPA module when connecting to an external
antenna:
• RF traces must have 50-Ω impedance.
• RF trace bends must be made with gradual curves, and 90° bends must be avoided.
• RF traces must not have sharp corners.
• There must be no traces or ground under the antenna section.
• RF traces must have via stitching on the ground plane beside the RF trace on both sides.
• RF traces must be as short as possible.
• The module must be as close to the PCB edge in consideration of the product enclosure and type of antenna
being used.
Copyright © 2023 Texas Instruments Incorporated
Product Folder Links: CC2651R3SIPA
SWRS278B – FEBRUARY 2022 – REVISED AUGUST 2023
Figure 10-5
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