Cavli Wireless C100QM - Main Set Antenna Interface; Diversity Antenna Interface

Cavli Wireless C100QM/C10QM Hardware Manual
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interface, which is responsible for 4G, 3G, 2G signals of the transceiver module, and a
diversity antenna interface. It is responsible for receiving 4G and 3G signals, and the signal
degradation caused by multipath under high-speed movement. Signals can be enhanced
by adding diversity antennas, as well as a GNSS antenna interface for GPS, Beidou,
GLONASS, GALILEO signal reception, which can provide positioning solutions for users.
The three-way antenna interface has an impedance of 50 ohms.
Table 3-24 Antenna interface pin definition
NO.
Signal name
I/O
description
Remarks
49
ANT_MAIN
IO
Main set antenna
interface
50Ω characteristic
impedance
35
ANT_DIV
AI
Diversity antenna
interface
50Ω characteristic
impedance
47
ANT_GNSS
AI
GNSS antenna interface
50Ω characteristic
impedance
3.17.1 Main set antenna interface
C100QM/C10QM's 49-pin main set antenna interface, in order to facilitate the antenna
debugging need to add π-type matching circuit on the motherboard, take 50 ohm
impedance line, the recommended circuit is as follows: