TOBY-L1 and MPCI-L1 series - System Integration Manual
UBX-13001482 - R04
Advance Information
System description
Page 30 of 90
1.7.1.1
Antenna RF interfaces requirements
Table 8, Table 9 and Table 10 summarize the requirements for the antennas RF interfaces (
ANT1
/
ANT2
). Refer
to section 2.4.1 for suggestions to properly design antennas circuits compliant to these requirements.
The antennas circuits affect the RF compliance of the device integrating TOBY-L1 and MPCI-L1
series modules with applicable required certification schemes. Compliance is guaranteed if the
antenna RF interfaces (ANT1 / ANT2) requirements summarized in Table 8, Table 9 and Table 10
are fulfilled.
Item
Requirements
Remarks
Impedance
50
Ω
nominal characteristic impedance
The impedance of the antenna RF connection must
match the 50
Ω
impedance of the
ANT1
pin / connector.
Frequency Range
•
746…756 MHz (Rx), 777…787 MHz (Tx)
•
1710...1755 MHz (Tx), 2110...2155 MHz (Rx)
The required frequency range of the antenna connected
to
ANT1
pin / connector depends on the operating
bands of the TOBY-L1 / MPCI-L1 module and the Mobile
Network.
Return Loss
S
11
< -10 dB (VSWR < 2:1) recommended
S
11
< -6 dB (VSWR < 3:1) acceptable
The Return loss or the S
11
, as the VSWR, refers to the
amount of reflected power, measuring how well the
primary antenna RF connection matches the 50
Ω
characteristic impedance of the
ANT1
pin / connector.
The impedance of the antenna termination must match
as much as possible the 50
Ω
nominal impedance of the
ANT1
pin / connector over the operating frequency
range, reducing as much as possible the amount of
reflected power.
Efficiency
> -1.5 dB ( > 70% ) recommended
> -3.0 dB ( > 50% ) acceptable
The radiation efficiency is the ratio of the radiated power
to the power delivered to antenna input: the efficiency is
a measure of how well an antenna receives or transmits.
The radiation efficiency of the antenna connected to the
ANT1
pin / connector needs to be enough high over the
operating frequency range to comply with the Over-The-
Air (OTA) radiated performance requirements, as Total
Radiated Power (TRP) and Total Isotropic Sensitivity (TIS),
specified by applicable related certification schemes.
Maximum Gain
< 6.57 dBi for LTE Band 4
< 10.70 dBi for LTE Band 13
The power gain of an antenna is the radiation efficiency
multiplied by the directivity: the gain describes how
much power is transmitted in the direction of peak
radiation to that of an isotropic source.
The maximum gain of the antenna connected to
ANT1
pin / connector must not exceed the herein specified
value to comply with regulatory agencies radiation
exposure limits.
For additional info refer to the chapter 4.2.1.
Input Power
> 24 dBm ( > 250 mW )
The antenna connected to the
ANT1
pin / connector
must support with adequate margin the maximum
power transmitted by the modules.
Table 8: Summary of primary Tx/Rx antenna RF interface (ANT1) requirements
