LE910Cx Hardware Design Guide
1VV0301298 Rev.40 Page 63 of 149 2023-03-16
Not Subject to NDA
7. ANTENNA(S)
Antenna connection and board layout design are the most important parts in the full
product design, and they have a strong influence on the overall performance of the
product. Read carefully and follow the requirements and guidelines for a good and proper
design.
GSM/WCDMA/TD-SCDMA/LTE Antenna Requirements
The antenna for the LE910Cx device must meet the following requirements:
Item Value
Frequency range The customer must use the most suitable antenna
bandwidth to cover the frequency bands provided by the
network operator and supported by the OEM while
using the Telit module.
The bands supported by each variant of the LE910Cx
module family are provided in Section 2.6.1, RF Bands
per Regional Variant.
Gain Gain < 3 dBi
Impedance 50 Ohm
Input power > 33 dBm(2 W) peak power in GSM
> 24 dBm average power in WCDMA & LTE
VSWR absolute max <= 10:1 (limit to avoid permanent damage)
VSWR recommended <= 2:1 (limit to fulfill all regulatory requirements)
Table 21: Primary Antenna Requirements
Since there is no antenna connector on the LE910Cx module, the antenna must be
connected to the LE910Cx antenna pad (AD1) by a transmission line implemented on the
PCB.
If the antenna is not directly connected to the antenna pad of the LE910Cx, a PCB line is
required to connect to it or to its connector.
This transmission line must meet the following requirements:
Item Value
Characteristic impedance 50 Ohm
Max attenuation 0.3 dB
Avoid coupling with other signals.
Cold End (Ground Plane) of the antenna must be equipotential to the LE910Cx ground pads.
Table 22: Antenna Line on PCB Requirements
To Next Page
Loading...
Need help?
General
