Telit Wireless Solutions LM940 Design Guide

LM940 Hardware Design Guide
1VV0301352 Rev. 18 Page 50 of 75 2022-01-04
Not Subject to NDA
7. RF SECTION
Antenna Requirements
The antenna connection is one of the most important aspect in the full product design as
it strongly affects the product overall performance. Hence please read carefully and
follow the requirements and the guidelines for a proper design.
The LM940 is provided with three RF connectors.
The available connectors are:
• Main RF antenna: TX/RX path
• Auxiliary RF antenna: Combined Diversity and GNSS
• GNSS RF antenna: Dedicated GNSS
Main Antenna Requirements
The antenna for the LM940 device must meet the following requirements:
Item
Value
Frequency range
Depending on frequency band(s) supported by the network operator,
the customer shall use the most suitable antenna for that/those
band(s)
The bands supported by the LM940 is provided in section 2.2 Product
Variants and Frequency Bands.
Impedance
50 Ohm
Input power
> 24 dBm average power in WCDMA and LTE
VSWR absolute max
<= 10:1
VSWR recommended
<= 2:1
Table 34: WCDMA / LTE Antenna Requirements
Antenna Diversity Requirements
This product includes an input for a second Rx antenna to improve radio sensitivity. The
function is called Antenna Diversity.
Item
Value
Frequency range
Depending on frequency band(s) supported by the network operator,
the customer shall use the most suitable antenna for that/those
band(s)
The bands supported by the LM940 is provided in section 2.2 Product
Variants and Frequency Bands.
Impedance
50Ω

Telit Wireless Solutions LM940 Specifications

General

Brand	Telit Wireless Solutions
Model	LM940
Category	Wireless modules
Language	English