User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.28 – 2015-06-24
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 43 of 43
6.3 Sensitivity
6.4 GSM/WCDMA Antenna Requirements
The antenna connection and board layout design are the most important aspect in the full
product design as they strongly affect the product overall performances, hence read carefully
and follow the requirements and the guidelines for a proper design.
The antenna and antenna transmission line on PCB for a Telit HE910 device shall fulfil the
following requirements:
ANTENNA 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)
Bandwidth (GSM/EDGE)
70 MHz in GSM850, 80 MHz in GSM900, 170 MHz in DCS & 140
MHz PCS band
Bandwidth
(WCDMA)
70 MHz in WCDMA Band V
80 MHz in WCDMA Band VIII
460 MHz in WCDMA Band IV
140 MHz in WCDMA Band II
250 MHz in WCDMA Band I
Impedance
50 ohm
Input power
> 33dBm(2 W) peak power in GSM
> 24dBm Average power in WCDMA
VSWR absolute max
≤ 10:1 (limit to avoid permanent damage)
VSWR recommended
≤ 2:1 (limit to fulfil all regulatory requirements)
When using the HE910, since there's no antenna connector on the module, the antenna must
be connected to the HE910 antenna pad (K1) by means of a transmission line implemented
on the PCB.
In the case the antenna is not directly connected at the antenna pad of the HE910, then a PCB
line is needed in order to connect with it or with its connector.
Band
Typical
(without Diversity)
Note
GSM 850
-
109.5 dBm
BER Class II <2.44%
GSM 900
-
109 dBm
BER Class II <2.44%
DCS1800
-
110 dBm
BER Class II <2.44%
PCS 1900
-
109.5 dBm
BER Class II <2.44%
WCDMA FDD B1
-
111 dBm
BER <0.1%
WCDMA FDD B2
-
110 dBm
BER <0.1%
WCDMA FDD B4
-
111 dBm
BER <0.1%
WCDMA FDD B5
-
111 dBm
BER <0.1%
WCDMA FDD B8
-
110 dBm
BER <0.1%