Rf Specifications; Cellular Network; Antenna Interfaces & Frequency Bands; Operating Frequency - Quectel EC21 Series Hardware Design

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.
ANT_MAIN 49
ANT_DIV 35

4.1.2. Operating Frequency

Table 26: Module Operating Frequencies
3GPP Band
GSM850
EGSM900
DCS1800
PCS1900
WCDMA B1
EC21_Series_Hardware_Design
I/O Description
AIO Main antenna interface
AI Diversity antenna interface
Transmit
824–849
880–915
1710–1785
1850–1910
1920–1980
LTE Standard Module Series
Comment
50 Ω impedance
50 Ω impedance.
If unused, keep it open.
Receive
869–894
925–960
1805–1880
1930–1990
2110–2170
Unit
MHz
MHz
MHz
MHz
MHz
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