Cinterion
®
ELS31-VA/ELS51-VA Hardware Interface Description
2.2 RF Antenna Interface
56
ELS31-VA_ELS51-VA_HID_v01.000
2017-01-04
Confidential / Preliminary
Page 46 of 106
2.2
RF Antenna Interface
The RF interface has an impedance of 50
Ω
. ELS31-VA/ELS51-VA is capable of sustaining a
total mismatch at the antenna line without any damage, even when transmitting at maximum
RF power.
The external antenna must be matched properly to achieve best performance regarding radi-
ated power, modulation accuracy and harmonic suppression. Antenna matching networks are
not included on the ELS31-VA/ELS51-VA module and should be placed in the host application
if the antenna does not have an impedance of 50
Ω
.
Regarding the return loss ELS31-VA/ELS51-VA provides the following values in the active
band:
2.2.1
Antenna Interface Specifications
ELS31-VA/ELS51-VA is equipped with two receiver ports. The sensitivity results according to
are verified by using both antenna ports according to the recommendation given in
3GPP TS 36.521-1, Chapter 7.2. The sensitivity results also depend on the selected band-
width.
Table 12:
Return loss in the active band
State of module
Return loss of module
Recommended return loss of application
Receive
> 8dB
> 12dB
Transmit not
applicable
> 12dB
Table 13:
RF Antenna interface LTE
Parameter
Conditions
Min.
Typical Max.
Unit
LTE connectivity
Band 4 and 13
Static Receiver input Sensi-
tivity @ ARP (ch. bandwidth
5MHz)
LTE Band 4
-99.3
-103
--
dBm
LTE Band 13
-99.3
-101
--
dBm
RF Power @ ARP with 50
Load
LTE Band 4
21
23
25
dBm
LTE Band 13
21
23
25
dBm