Telit Wireless Solutions CE910-DC, Руководство пользователя по оборудованию, Страница: 35 / 67

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.
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
140 MHz in CDMA BC1
Gain
Gain < 5.12dBi in CDMA BC0
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
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