N720 OpenLinux
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
53
ANT_GNSS
92
AI
GNSS antenna
ANT_DIV
94
AI
Diversity antenna
3.5.1 ANT_MAIN/ANT_DIV antenna interface
MAIN_ANT and DIV_ANT of N720 OpenLinux require a characteristic impedance of 50 Ω. Developers
should control the impedance of the traces between the pins and antenna to ensure the RF
performance. An impedance matching circuit, such as L network, T network, or pi network is mandatory
in between. Pi network is recommended.
Figure 3-46 L network
ANT_MAIN
N720
module
Z1
Z2
ESD
(ANT_DIV)
Figure 3-47 Split capacitor network
ANT_MAIN
N720
module
Z2
Z3
ESD
Z1
(ANT_DIV)