User's Guide

LE920A4 HW User Guide Antenna(s)
Doc#: 1VV0301261 GSM/WCDMA/TD-SCDMA/LTE Antenna Requirements
Rev. 4.7.1 Page 62 of 124 2019-11-21
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 product’s overall performance.
Read carefully and follow the requirements and the guidelines for a good and proper
design.
GSM/WCDMA/TD-SCDMA/LTE Antenna Requirements
The antenna connected to the module must fulfill the following requirements:
Table 20: Antenna Requirements
Frequency range
The customer must use the most suitable antenna bandwidth
for covering the frequency bands provided by the network
operator and also supported by the car OEM while using the
Titan module.
The bands supported by each variant of the module family are
given in Section 0.
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
VSWR recommended <= 2:1
Since there is no antenna connector on the module, the antenna must be connected to
the module’s antenna pad (AD1) by a transmission line implemented on the PCB.
If the antenna is not directly connected to the antenna pad of the module, a PCB line is
required to connect to it or to its connector.
This transmission line must meet the following requirements:
Table 21: Antenna Line on PCB Requirements
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 module’s ground
pads.