u-blox NEO-M8U Hardware Integration Manual

Also see for NEO-M8L: Hardware Integration Manual

Contents

u-blox NEO-M8U Hardware Integration Manual Manual pdf 12 page image

NEO-M8U - Hardware Integration ManualUBX-15016700 - R07 Design Page 12 of 28Production Information☞ Consider the paste mask outline when defining the minimal distance to the next component. Theexact geometry, distances, stencil thicknesses and solder paste volumes must be adapted to thespecific production processes (e.g. soldering) of the customer.2.4 Antenna2.4.1 Antenna design with passive antennaA design using a passive antenna requires more attention to the layout of the RF section. Typically, apassive antenna is located near electronic components; therefore, care should be taken to reduceelectrical noise that may interfere with the antenna performance. Passive antennas do not require aDC bias voltage and can be directly connected to the RF input pin RF_IN. Sometimes, they may alsoneed a passive matching network to match the impedance to 50 Ω.Figure 6 shows a minimal setup for a design with a good GNSS patch antenna. For exact pinorientation, see theNEO-M8U Data Sheet [1].Figure 6: Module design with passive antenna☞ Use an antenna that has sufficient bandwidth to receive all GNSS constellations. For moreinformation see the appendix and theGPS Antenna Application Note [3].Stencil: 170 μm10.4 mm [409.5 mil]14.6 mm [575 mil]12.2 mm [480 mil]0.8 mm[31.5 mil]0.6 mm[23.5 mil]12.2 mm [480.3 mil]16.0 mm [630 mil]1.0 mm[39.3 mil]0.8 mm[31.5 mil]0.8 mm[31.5 mil]3.0 mm[118.1 mil]1.0 mm[39.3 mil] 1.1 mm[43.3 mil]Figure 5: NEO-M8U footprint / NEO-M8U paste mask