User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.9 – 07-02-2012
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 42 of 80
6.4 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, 170 MHz in
DCS & 140 MHz PCS band
Bandwidth
(WCDMA)
70 MHz in WCDMA Band V
80 MHz in WCDMA Band VIII
460 MHz in WCDMA Band IV (see NOTE1)
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 HE910-GA is not supporting the FDD BAND IV