LL-RLP-20 Datasheet
www.link-labs.com
Information contained in this document is subject to change without notification
7
PCB LAYOUT REQUIREMENTS
Since this module and its associated set of approved antennas has been certified by the FCC
and Industry Canada (IC) as a Modular Radio, the end user is authorized to integrate this
module into an end-product, and is solely responsible for the Unintentional Emissions levels
produced by the end-product.
In order to preserve the Modular Radio certifications, the integrator of the module must abide by
the PCB layout recommendations outlined in the following paragraphs. Any divergence from
these recommendations will invalidate the modular radio certifications and require the integrator
to re-certify the module and/or end product.
The module must be used with one of the approved antennas:
½-wave center-fed dipole antennas tuned for 915 MHz with a maximum gain of 1.9 dBi
or less, such as ANT-916-CW-HWR-SMA
Integrated trace antenna.
TRACE ANTENNA REFERENCE DESIGN
The red area in Fig. 2 represents the copper ground pour an end user must build into his/her
carrier board for the trace antenna to perform optimally. This ground pour continues as a solid
plane extending underneath the module, with the exception of the antenna area shown below.
Components may be placed above/below the copper ground pour, but the copper layer must
itself be uninterrupted. While a ground pour under the module is required, a trace and via keep-
out is recommended for the layer directly below the module. The bottom of the module is
masked, however there still remains a risk of shorts occurring if traces and vias are directly
under the module. If it is necessary to run traces or vias under the module ensure that all vias
are masked.
