Installation Manual

5
Antenna Diversity Requirements
This product is including an input for a second Rx antenna to improve radio sensitivity. This function is
named Antenna Diversity. The diversity antenna shall fulfil the following requirements:
Item
Value
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
60 MHz in LTE/WCDMA Band 2
45 MHz in LTE Band 4
25 MHz in LTE/WCDMA Band 5
35 MHz in LTE Band 8 / GSM900
15 MHz in LTE Band 12
10 MHz in LTE Band 13
12 MHz in LTE band 17
Impedance
50 ohm
VSWR recommended
≤ 2:1 (limit to obtain max sensitivity)
Since there is no antenna connector on the module, the diversity antenna must be connected to the
module’s Diversity Antenna pad (F1) by means of a transmission line implemented on the PCB.
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.