User's Manual

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design Confidential / Released 60 / 94
5 Antenna Interfaces
EC21 antenna interfaces include a main antennainterface,anRx-diversity antenna interface which is used
toresist the fall of signals caused by high speed movement and multipath effect, and a GNSS antenna
interface. The antenna interfaceshave an impedance of 50ohm.
5.1. Main/Rx-diversityAntenna Interface
5.1.1. Pin Definition
The pin definition of main antenna and Rx-diversityantenna interfacesis shown below.
Table 25: Pin Definition of the RF Antenna
Pin Name Pin No. I/O Description Comment
ANT_MAIN 49 IO Main antenna pad 50ohmimpedance
ANT_DIV 35 AI Receive diversityantenna pad 50ohm impedance
5.1.2. Operating Frequency
Table 26: Module Operating Frequencies
3GPP Band Transmit Receive Unit
B1 1920~1980 2110~2170 MHz
B2 (1900) 1850~1910 1930~1990 MHz
B3 (1800) 1710~1785 1805~1880 MHz
B4 1710~1755 2110~2155 MHz
B5 (850) 824~849 869~894 MHz
B7 2500~2570 2620~2690 MHz
B8 (900) 880~915 925~960 MHz