TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
System description
Page 35 of 164
1.7
Antenna interface
1.7.1
Antenna RF interfaces (ANT1 / ANT2)
TOBY-L2 and MPCI-L2 series modules provide two RF interfaces for connecting external antennas:
The ANT1 represents the primary RF input/output for transmission and reception of LTE/3G/2G
RF signals.
The ANT1 pin of TOBY-L2 modules has a nominal characteristic impedance of 50
and must be
connected to the primary Tx / Rx antenna through a 50
transmission line to allow proper RF
transmission and reception.
The ANT1 Hirose U.FL-R-SMT coaxial connector receptacle of MPCI-L2 modules has a nominal
characteristic impedance of 50
and must be connected to the primary Tx / Rx antenna through
a mated RF plug with a 50
coaxial cable assembly to allow proper RF transmission and reception.
The ANT2 represents the secondary RF input for the reception of the LTE RF signals for the
Down-Link MIMO 2 x 2 radio technology supported by TOBY-L2 and MPCI-L2 series modules as
required feature for LTE category 4 UEs, and for the reception of the 3G RF signals for the
Down-Link Rx diversity radio technology supported by TOBY-L2 and MPCI-L2 series modules as
additional feature for 3G DC-HSDPA category 24 .
The ANT2 pin of TOBY-L2 modules has a nominal characteristic impedance of 50
and must be
connected to the secondary Rx antenna through a 50
transmission line to allow proper RF
reception.
The ANT2 Hirose U.FL-R-SMT coaxial connector receptacle of MPCI-L2 modules has a nominal
characteristic impedance of 50
and must be connected to the secondary Rx antenna through a
mated RF plug with a 50
coaxial cable assembly to allow proper RF reception.
The Multiple Input Multiple Output (MIMO) radio technology is an essential component of LTE radio
systems based on the use of multiple antennas at both the transmitter and receiver sides to improve
communication performance and achieve highest possible bit rate. A MIMO m x n system consists of
m transmit and n receive antennas, where the data to be transmitted is divided into m independent
data streams. Note that the terms Input and Output refer to the radio channel carrying the signal, not
to the devices having antennas, so that in the Down-Link MIMO 2 x 2 system supported by TOBY-L2
and MPCI-L2 series modules:
The LTE data stream is divided into 2 independent streams by the Tx-antennas of the base station
The cellular modules, at the receiver side, receives both LTE data streams by 2 Rx-antennas
(ANT1 / ANT2)
Base Station
Tx-1
Antenna
Tx-2
Antenna
TOBY-L2 series
MPCI-L2 series
ANT1
Rx-1
Antenna
ANT2
Rx-2
Antenna
Data Stream 1
Data Stream 2
Figure 18: Description of the LTE Down-Link MIMO 2 x 2 radio technology supported by TOBY-L2 and MPCI-L2 series modules
TOBY-L2 and MPCI-L2 series modules support the LTE MIMO 2 x 2 radio technology in the Down-Link
path only (from the base station to the module): the ANT1 port is the only one RF interface that is used
by the module to transmit the RF signal in the Up-Link path (from the module to the base station).
