LEA-M8S / LEA-M8T - Hardware Integration Manual
UBX-13003140 - R07
Production Information
Design
Page 11 of 31
17.0 mm [669 mil]
22.
4 m
m
[881
.9 m
il]
1.0 mm
[39 mil]
0.
8 mm
[3
1.
5 m
il]
2.
45 m
m
[9
6.
5 m
il]
1.
1 mm
[43 m
il]
3.
0 mm
[11
8 m
il]
2.
15 m
m
[84
.5 m
il]
0.8 mm
[31.5 mil]
Figure 5: LEA-M8S / LEA-M8T footprint
Figure 6: LEA-M8S / LEA-M8T paste mask
2.4
Antenna and Antenna supervision
2.4.1
Antenna design with passive antenna
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, care should be taken 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
.
Minimal setup with a good patch antenna
Figure 7 shows a minimal setup for a design with a good GNSS patch antenna.
Figure 7: Module design with passive antenna (for exact pin orientation see the LEA-M8S Data Sheet [1] and the NEO/LEA-M8T
Data Sheet [2])
