User's Manual

CL865-DUAL Hardware User Guide
1vv0301104 Rev.1 – 2014-03-07
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 31 of 70
Mod. 0805 2011-07 Rev.2
7. Antenna
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 performance. Read carefully
and follow the requirements and the guidelines for a proper design.
7.1. CDMA Antenna Requirements
The antenna for a Telit CL865 device must fulfill the following requirements:
CL865 Specifications
Frequency range
Depending on the frequency band(s) provided by the
network operator, the customer must use the most suitable
antenna for that/those band(s)
Bandwidth
70 MHz in CDMA BC0
53 MHz in CDMA BC10 (subclass 2,3)
140 MHz in CDMA BC1
Gain
Gain < 5.12dBi in CDMA BC0
Gain < 5.12dBi in CDMA BC10 (subclass 2,3)
Gain < 6.12dBi in CDMA BC1
Impedance
50 Ohm
Input power
> 24.5dBm Average Power in CDMA
VSWR absolute max
≤ 5:1 (Limit to avoid permanent damage)
VSWR recommended
≤ 2:1 (Limit to fulfill all regulatory requirement)
When using the Telit CL865, since there’s no antenna connector on the module, the antenna
must be connected to the CL865 antenna pad (pin 34) 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 CL865, then a
PCB line is required. This transmission line shall fulfill the following requirements:
Antenna Line on PCB Requirements
Characteristic Impedance
50Ohm
Max Attenuation
0.3dB
Coupling with other signals shall be avoided
Cold End (Ground Plane) of antenna shall be equipotential to the CL865 ground pads
Furthermore if the device is developed for the US and/or Canada market, it must comply with
the FCC and/or IC approval requirements:
This device is 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