User's Manual

CE910 Family Hardware User Guide

1vv0301010 Rev.11 – 2015-10-27

Page 38 of 75

6. 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.

6.1. CDMA Antenna Requirements

The antenna for a Telit CE910 device must fulfill the following requirements:

CE910 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

140 MHz in CDMA BC1

Gain

Gain < 5.12dBi in CDMA BC0

Gain < 5.12dBi in CDMA BC10

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 CE910, since there’s no antenna connector on the module, the antenna must be

connected to the CE910 antenna pad (K1) 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 CE910, 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 CE910 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