User's Guide

LE920A4 HW User Guide Antenna(s)
Doc#: 1VV0301261 GSM/WCDMA/TD-SCDMA/LTE Antenna – Installation Guidelines
Rev. 4.7.1 Page 64 of 124 2019-11-21
GSM/WCDMA/TD-SCDMA/LTE Antenna – Installation Guidelines
 Install the antenna in a location with access to the network radio signal.
 The antenna must be installed such that it provides a separation distance of at
least 20 cm from all persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
 The antenna must not be installed inside metal cases.
 The antenna must be installed according to the antenna manufacturer’s
instructions.
Antenna Diversity Requirements
This product includes an input for a second Rx antenna to improve the radio sensitivity.
The function is called Antenna Diversity.
Table 22: Antenna Diversity Requirements
Frequency range The customer must use the most suitable antenna band
width for covering the frequency bands provided by the
network operator and also supported by the car OEM while
using the Titan module.
The bands supported by each variant of the module family
are provided in Section 2.6.1, RF Bands per Regional
Variant.
Impedance 50Ω
VSWR recommended ≤ 2:1
Since there is no antenna connector on the module, the antenna must be connected to
the module’s antenna pad by a transmission line implemented on the PCB.
If the antenna is not directly connected at the antenna pad of the module, a PCB line is
required to connect to it or to its connector.
The second Rx antenna must not be located in close vicinity of the main antenna. To
improve the diversity gain and isolation and to reduce mutual interaction, the two
antennas should be located at the maximum reciprocal distance possible, taking into
consideration the available space within the application.
NOTE:
If Rx Diversity is not used/connected, disable the Diversity functionality using
the AT#RXDIV or AT#LRXDIV command (refer to Ref 1: LE920A4 AT
Command User Guide) and leave the Diversity pad AU9 unconnected.