KB: RSL10 SIP placement recommendations

Two RSL10 SIP placement questions:

  1. Where is the best place on the PCB for the RSL10 SIP module?
  2. Where is the best place in the device for the RSL10 SIP module?

Recommendations:

1. Where is the best place on the PCB for the RSL10 SIP module? The RSL10 SIP datasheet shows all the information related to this question:

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Figure 1. RSL10 SIP Keepout Area Requirements

Placement:

  1. Align component edge to PCB edge if possible.
  2. Extend keepout area to PCB edge.
  3. Keepout area− All layers.
  4. Keepout area− Top layer only.
  5. Units = mm.

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Figure 2. Minimum Top Layer Ground Structure

Placement:

  1. When incorporating internal antenna, join landing pads using 0.40 x 1.10 shape.
  2. Establish 50 mm impedance to underlying reference plane.
  3. Maintain minimum 300 mm distance from ground plane.
  4. Area for several vias.
  5. Refer to radiation efficiency data for applicable ground plane sizing.
  6. Units = mm.

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Figure 3. PCB ground planes. 1) 50x60, 2) 40x60, 3) 30x60, 4) 25x60, 5) 12.5x60. All sizes in mm

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Figure 4. Antenna Efficiency vs. PCB Size

The RSL10 SIP should be placed on the edge of the PCB. The PCB size will impact the SIP’s efficiency.

Here is an example:

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Figure 5. Example for RSL10 SIP placement on the PCB

2. Where is the best place in the device for the RSL10 SIP module? The RSL10 SIP should be placed on an outside edge of the end-product device following general antenna design principles, without obstructions (e.g. metal) that would interfere the antenna’s radiation pattern.

Here is an example:

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Figure 6 Example for RSL10 SIP placement in the Device

In this example, there is a battery and some metal material around the RSL10 SIP antenna.
The antenna’s efficiency and its radiation will change as a result. In this case, the antenna performance needs to be retested.

Note:

The RSL10 antenna performance results on the datasheet (efficiency and radiation pattern etc. ) are based on these conditions.