User Guide

LM960 HW Design Guide
1VV0301485 Rev. 15 Page 63 of 88 2020-08-13
VSWR absolute max <= 10:1
VSWR recommended <= 2:1
Secondary Antenna Requirements
This product includes an input for a second Rx antenna to improve radio sensitivity. The
function is called Antenna Diversity.
Antenna Diversity 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)
The bands supported by the LM960 is provided in Section 2.2,
Product Variants and Frequency Bands.
Impedance 50Ω
VSWR recommended ≤ 2:1
The second Rx antenna should not be located in the close vicinity of the 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. 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.