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5
Antenna Interface
EC25 antenna interface includes a main antenna, an Rx-diversity antenna which is used to resist the fall
of signals caused by high speed movement and multipath effect, and a GNSS antenna. The antenna
interface has an impedance of 50ohm.
5.1. Main/Rx-diversity Antenna Interface
5.1.1. Pin Definition
The main antenna and Rx-diversity antenna pins definition are shown below.
Table 22: Pin Definition of the RF Antenna
Pin Name
Pin No.
ANT_MAIN
49
35
ANT_DIV
5.1.2. Operating Frequency
Table 23: The Module Operating Frequencies
3GPP Band
B4
B13
5.1.3. Reference Design
The reference design of ANT_MAIN and ANT_DIV antenna is shown as below. It should reserve a π-type
matching circuit for better RF performance. The capacitors are not mounted by default.
EC25-V_User_Manual
69
I/O
Description
IO
Main antenna
AI
Receive diversity antenna
Transmit
1710 ~ 1755
777 ~ 787
Confidential / Released
EC25-V User Manual
Comment
50ohm impedance
50ohm impedance
Receive
2110 ~ 2155
746 ~ 756
LTE Module Series
Unit
MHz
MHz
47 /
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