Neoway N75 - ANT_MAIN;ANT_DIV Antenna Interface; Figure 3-46 L Network; Figure 3-47 Split Capacitor Network

N75
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
52
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 N75 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
N75
module
Z1
Z2
ESD
(ANT_DIV)
Figure 3-47 Split capacitor network
ANT_MAIN
N75
module
Z2
Z3
ESD
Z1
(ANT_DIV)