User's Manual

HE910 Hardware User Guide

1vv0300925 Rev.28 – 2015-06-24

6.8 Antenna Diversity Requirements

This product is including an input for a second RX antenna to improve the radio sensitivity. The

function is called Antenna Diversity.

ANTENNA REQUIREMENTS

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 (GSM/EDGE)

70 MHz in GSM850, 80 MHz in GSM900 & 140 MHz PCS

band

Bandwidth

(WCDMA)

70 MHz in WCDMA Band V

80 MHz in WCDMA Band VIII

140 MHz in WCDMA Band II

250 MHz in WCDMA Band I

Impedance 50 ohm

When using the HE910, since there's no antenna connector on the module, the antenna must be

connected to the HE910 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 HE910, 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.

NOTE1:

The Diversity is not supported on DCS 1800 in 2G and FDD BAND IV in 3G

NOTE:

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

AT#RXDIV command (ref to the AT User guide for the proper syntax) and leave the pad F1

unconnected.