LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 71 / 130
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 50Ω.
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 50Ω impedance
ANT_DIV
35 AI
Receive diversity antenna
50Ω 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
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