Ublox LEA-M8F, Руководство по интеграции оборудования

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LEA-M8F - Hardware Integration Manual
UBX-14000034 - R03 Early Production
Information
Design
Page 16 of 30
Figure 11: Micro strip on a multi layer board (Agilent AppCAD Coplanar Waveguide)
2.2 GNSS Antenna Connection
2.2.1 Passive Antenna Connection
A design using a passive antenna requires more attention to the layout of the RF section. Typically, a passive
antenna is located near electronic components; therefore take care to reduce electrical noise that may interfere
with the antenna performance. Passive antennas do not require a DC bias voltage and can be directly connected
to the RF input pin,
RF_IN . Sometimes, they may also need a passive matching network to match the impedance
to 50
Ω
.
Figure 12 shows a minimal setup for a design with a good GNSS patch antenna.
Figure 12: Module design with passive antenna (for exact pin orientation see the LEA-M8F Data Sheet
[1]
)
Use an antenna that has sufficient bandwidth to receive all GNSS constellations. See the recommended
types in the Appendix.