L
LE920 Hardware User Guide
1vv0301026 Rev.0 - draft4 – 2013-05-
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 42 of 76
6.
Antenna(s)
The antenna connection and board layout design are the most important parts in the full
product design and they strongly reflect on the product’s overall performances. Read carefully
and follow the requirements and the guidelines for a proper design.
6.1.
GSM/WCDMA/LTE Antenna Requirements
The antenna for a Telit LE920 device must fulfill the following requirements:
When using the Telit LE920, since there’s no antenna connector on the module, the antenna
must be connected to the LE920 antenna pad (AD1) by means of a transmission line
implemented in the PCB.
In the case that the antenna is not directly connected at the antenna pad of the LE920, then a
PCB line is required in order to connect with it or with its connector.
This transmission line shall fulfill the following requirements:
GSM / WCDMA/ LTE Antenna Requirements
Frequency
range
Depending by frequency band(s) provided by the network operator, the
customer must use the most suitable antenna for that/those band(s)
Bandwidth
LE920-EU
LE920-NA
GSM850 : 70 MHz
GSM900 : 80 MHz
GSM1800(DCS) : 170 MHz
GSM1900(PCS) : 140 MHz
WCDMA band I(2100) : 250 MHz
WCDMA band III(1800) : 170 MHz
WCDMA band VIII(900) : 80 MHz
LTE Band I(2100) : 250 MHz
LTE band III(1800) : 170 MHz
LTE Band VII(2600) : 190 MHz
LTE Band VIII(900) : 80 MHz
LTE Band XX(800) : 71 MHz
GSM850 : 70 MHz
GSM900 : 80 MHz
GSM1800(DCS) : 170 MHz
GSM1900(PCS) : 140 MHz
WCDMA band I(2100) : 250 MHz
WCDMA band II(1900) : 140 MHz
WCDMA band IV(1700) : 445 MHz
WCDMA band V(850) : 70 MHz
WDCMA band VI(800): 70MHz
LTE Band I(2100) : 250 MHz
LTE Band II(1900) : 140 MHz
LTE Band IV(1700) : 445 MHz
LTE Band V (850) : 70 MHz
LTE Band XVII(700) : 42 MHz
Gain
0D[$QW
Gain
G
Bi
Impedance
50 Ohm
Input power
> 33dBm(2 W) peak power in GSM
> 24dBm Average power in WCDMA & LTE
VSWR
absolute max
<= 10:1
VSWR
recommended
<= 2:1
