HW User Guide
1vv0301018 Rev. 15
Page
30
of
72
2019-01-07
7. ANTENNA
The antenna connection and board layout design are the most important aspect in the full
product design as they strongly affect the product overall performance, hence read carefully
and follow the requirements and the guidelines for a proper design.
GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna transmission line on
PCB for a Telit GL865 V3/V3.1 device shall fulfill 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
70 MHz in GSM850, 80 MHz in GSM900, 170 MHz in DCS & 140 MHz
PCS band
Impedance
50
Ω
Input power
> 2 W
VSWR absolute max
≤ 10:1
(limit to avoid permanent damage)
VSWR recommended
≤ 2:1 (limit to fulfi
ll all regulatory requirements)
Furthermore if the devices are developed for the US market and/or Canada market (GL865-
QUAD V3 variant only), they shall comply to the FCC and/or IC approval requirements:
Those devices are to be used only for mobile and fixed application. The antenna(s) used
for this transmitter must be installed to provide a separation distance of at least 20 cm from
all persons and must not be co-located or operating in conjunction with any other antenna
or transmitter. End-Users must be provided with transmitter operation conditions for
satisfying RF exposure compliance. OEM integrators must ensure that the end user has no
manual instructions to remove or install the GL865-QUAD V3. Antennas used for those
OEM modules must not exceed 3dBi gain for mobile and fixed operating configurations.
7.1.1.
GL865 V3/V3.1 Antenna – PCB line Guidelines
When using the Telit GL865 V3/V3.1 module, since there's no antenna connector on the
module, the antenna must be connected to the GL865 V3/V3.1 through the PCB with the
antenna pad (pin 34).
In the case that the antenna is not directly developed on the same PCB, hence directly
connected at the antenna pad of the GL865 V3/V3.1, then a PCB line is needed in order to
connect with it or with its connector.
This transmission line shall fulfill the following requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Impedance
50
Ω
Max Attenuation
0,3 dB
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be equipotential to the GL865
V3/V3.1 ground pins
