Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
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5
Antenna Interfaces
EG91 series module antenna interfaces include a main antenna interface and 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 which is only supported on EG91-AUX/-EX/-NA/-NAL/-NAX/-NAXD/
-NAXDL/-NAL/-VX. The impedance of the antenna port is 50 Ω.
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 23: Pin Definition of RF Antenna
1. Pin 49 is defined as ANT_GNSS on EG91-AUX/-EX/-NA/-NAL/-NAX/-NAXD/-NAXDL/-VX, while it is
defined as ANT_DIV on EG91-E.
2. Pin 56 is RESERVED on EG91-E, while it is defined as ANT_DIV on EG91-EX/-NA/-NAL/-NAX/
-NAXD/-NAXDL/-VX. Rx-diversity antenna is not supported on EG91-AUX.
Pin Name Pin No. I/O Description Comment
ANT_MAIN
60 AIO Main antenna Interface 50 Ω impedance
ANT_DIV
(EG91-E)
49 AI Diversity antenna interface
50 Ω impedance.
If unused, keep it open.
ANT_DIV
(EG91-EX/-NA/-NAL/
-NAX/-NAXD/-NAXDL/
-VX)
56 AI
Diversity receive antenna
interface
50 Ω impedance.
If unused, keep it open.
NOTE