Quectel EC21 Series User Manual

LTE Standard Module Series
EC21_Series_Hardware_Design
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4
RF Specifications
EC21 series 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 impedance of antenna ports is 50 Ω.
4.1. Cellular Network
4.1.1. Antenna Interfaces & Frequency Bands
The pin definition of main antenna and Rx-diversity antenna interfaces is shown below.
Table 25: Pin Definition of RF Antennas
Pin Name Pin No. I/O Description Comment
ANT_MAIN 49 AIO Main antenna interface 50 Ω impedance
ANT_DIV
35 AI
Diversity antenna interface
50 Ω impedance.
If unused, keep it open.
4.1.2. Operating Frequency
Table 26: Module Operating Frequencies
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

Quectel EC21 Series Specifications

General

Brand	Quectel
Model	EC21 Series
Category	Control Unit
Language	English