Antenna Interfaces; Main/Rx-Diversity Antenna Interface; Pin Definition; Operating Frequency - Quectel EC21 Series Hardware Design

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Antenna Interfaces

EC21 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 interfaces have an impedance of 50 ohm.

5.1. Main/Rx-diversity Antenna Interface

5.1.1. Pin Definition

The pin definition of main antenna and Rx-diversity antenna interfaces is shown below.
Table 25: Pin Definition of the RF Antenna
Pin Name Pin No.
ANT_MAIN 49
ANT_DIV 35

5.1.2. Operating Frequency

Table 26: Module Operating Frequencies
3GPP Band
B1
B2 (1900)
B3 (1800)
B4
B5 (850)
B7
B8 (900)
EC21_Hardware_Design
I/O Description
IO Main antenna pad
AI Receive diversity antenna pad
Transmit
1920~1980
1850~1910
1710~1785
1710~1755
824~849
2500~2570
880~915
Confidential / Released
LTE Module Series
EC21 Hardware Design
Comment
50 ohm impedance
50 ohm impedance
Receive
2110~2170
1930~1990
1805~1880
2110~2155
869~894
2620~2690
925~960
Unit
MHz
MHz
MHz
MHz
MHz
MHz
MHz
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