User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 62 of 124 2019-07-15
GSM/WCDMA/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 radio sensitivity. The
function is called Antenna Diversity.
Table 21: Antenna Diversity Requirements
Frequency range
The customer must use the most suitable antenna bandwidth
for covering the frequency bands provided by the network
operator and supported by the OEM while using the Telit
module.
The bands supported by each variant of the LE910Cx
module family are provided in Section 2.6.1, RF Bands per
Regional Variant
Impedance
50Ω
VSWR recommended
≤ 2:1 (limit to fulfill all regulatory requirements)
Since there is no antenna connector on the LE910Cx module, the antenna must be
connected to the LE910Cx antenna pad by means of a transmission line implemented on
the PCB.
If the antenna is not directly connected at the antenna pad of the LE910Cx (AU9), 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 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+XRXDIV command (refer to Ref 1: LE920x4/LE910Cx AT Command
User Guide) and connect the Diversity pad AU9 to a 50 Ohm termination.