Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 73 / 134
5 Antenna Interfaces
EC25 antenna interfaces include a main antenna interface, an Rx-diversity antenna interface which is
used to resist the fall of signals caused by high speed movement and multipath effect, and a GNSS
antenna interface. The antenna ports have an impedance of 50 Ω.
5.1. Main/Rx-diversity Antenna Interfaces
5.1.1. Pin Definition
The pin definition of main antenna and Rx-diversity antenna interfaces is shown below.
Table 26: Pin Definition of RF Antennas
5.1.2. Operating Frequency
Table 27: Module Operating Frequencies
Pin Name
Pin No.
I/O
Description
Comment
ANT_MAIN
49
IO
Main antenna
50 Ω impedance
ANT_DIV
35
AI
Receive diversity antenna
50 Ω impedance.
If unused, keep it
open.
3GPP Band
Transmit
Receive
Unit
GSM850
824–849
869–894
MHz
EGSM900
880–915
925–960
MHz
DCS1800
1710–1785
1805–1880
MHz
PCS1900
1850–1910
1930–1990
MHz
WCDMA B1
1920–1980
2110–2170
MHz