User's Manual

GL865-DUAL/QUAD V3 Hardware User Guide
1vv0301018 Rev.7 – 2013-10-30
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 30 of 78
Mod. 0805 2011-07 Rev.2
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.
7.1. GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna transmission line on PCB
for a Telit GL865-DUAL/QUAD V3 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 Ohm
Input power
> 2 W
VSWR absolute max ≤ 10:1 (limit to avoid permanent damge)
VSWR recommended ≤ 2:1 (limit to fulfill 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-DUAL/QUAD V3 Antenna – PCB line Guidelines
When using the Telit GL865-DUAL/QUAD V3 module, since there's no antenna connector
on the module, the antenna must be connected to the GL865-DUAL/QUAD V3 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-DUAL/QUAD V3, then a PCB line is needed in
order to connect with it or with its connector.