User's Manual

LTE Module
EC20 Hardware Design
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5 Antenna Interface
EC20 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.
I/O
Description
Comment
ANT_MAIN
49
IO
Main antenna
50ohm impedance
ANT_DIV
35
AI
Receive diversity antenna
50ohm impedance
5.1.2. Operating Frequency
Table 23: The Module Operating Frequencies
3GPP Band
Transmit
Receive
Unit
B2 (1900)
1850 ~ 1910
1930 ~ 1990
MHz
B4
1710 ~ 1755
2110 ~ 2155
MHz
B5 (850/BC0)
824 ~ 849
869 ~ 894
MHz
B12
699 ~ 716
728 ~ 746
MHz
B17
704 ~ 716
734 ~ 746
MHz