User's Manual

LE910 Hardware User Guide

1vv0301089 Rev.7 – 25-10-2015

DIVERSITY ANTENNA REQUIREMENTS for LE910-SKG

Frequency range

Depending by frequency band(s) provided by the network operator, the

customer shall use the most suitable antenna for that/those band(s)

Bandwidth

(LTE)

LTE band III(1800) : 75 MHz

LTE Band V (850) : 25 MHz

Impedance

50 ohm

VSWR recommended

≤ 2:1 (recommended for best sensitivity performance)

When using the LE910, since there's no antenna connector on the module, the antenna must be

connected to the LE910 antenna pad (F1) by means of a transmission line implemented on the

PCB.

In the case the antenna is not directly connected at the antenna pad of the LE910, then a PCB

line is needed in order to connect with it or with its connector.

The second Rx antenna should not be located in the close vicinity of main antenna. In order to

improve Diversity Gain, Isolation and reduce mutual interaction, the two antennas should be

located at the maximum reciprocal distance possible, taking into consideration the available

space into the application. For the same reason, the Rx antenna should also be cross-polarized

with respect to the main antenna.

Isolation between main antenna and Rx antenna must be at least 10 dB in all uplink frequency

bands.

Envelope Correlation Coefficient (ECC) value should be as close as possible to zero, for best

diversity performance. ECC values below 0.5 on all frequency bands are recommended.

NOTE:

If the RX Diversity is not used/connected, disable the Diversity functionality using the

AT#RXDIV command (refer to the AT User guide) and leave the Diversity pad F1 unconnected.