Ublox NORA-W36 Series, Руководство по системной интеграции

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NORA-W36 series - System integration manual
UBX-22021120 - R01 Design-in Page 18 of 48
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• Further to the custom PCB and product restrictions, antennas may require tuning/matching to
comply with all the applicable required certification schemes. It is recommended to consult the
antenna manufacturer for the design-in guidelines and plan the validation activities on the final
prototypes like tuning/matching and performance measures. See also
Table 3 .
• RF section may be affected by noise sources like hi-speed digital buses. Avoid placing the antenna
close to buses such as DDR or consider taking specific countermeasures like metal shields or
ferrite sheets to reduce interference.
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Give due consideration to the interaction between co-located RF systems like LTE sidebands on
the 2.4 GHz band. Transmitted power can interact or disturb the performance of NORA-W36
modules.
3.2.3 NORA-W361 U.FL reference design
Figure 4 shows the U.FL connector (J6) for connecting an approved external antenna. When using a
pi network, a 10pF 0201 series capacitor, similar to that shown as C14 in Figure 4, should be used.
Figure 4: NORA-W361 approved U.FL antenna connection – 2D view
3.2.4 On-board antenna design (NORA-W366)
If a plastic enclosure is used, it is possible to use NORA-W366 with the embedded antenna. To reach
optimum operating performance, follow the instructions in this section.
3.2.4.1 NORA-W366 – PCB trace antenna
• The module shall be placed in the center of an edge of the host PCB.
• A large ground plane on the host PCB is a prerequisite for good antenna performance. It is
recommended to have the ground plane extending at least 10 mm on the three non-edge sides of
the module. See also
Figure 5 .
• The host PCB shall include a full GND plane underneath the entire module, with a ground cut out
under the PCB trace antenna according to the description in Figure 6 .
• The NORA-W3x6 has six extra GND pads under the antenna that need to be connected for a good
antenna performance. Detailed measurements of the footprint including this extra GND pads can
be found in the NORA-W36 series datasheet
[2] .
• High / large parts that include metal shall not be placed closer than 10 mm to the module antenna.
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