Wistron NeWeb IMG02 User Manual

IMG02

LTE RF Module

OEM User Manual

Features

LTE: LTE-FDD, Rel9, Category 4, Band 13
GPS: Standard GPS/AGPS supported
Antenna Connector LTE Main/Diversity, GPS
UICC Support USIM, ISIM
Form Factor M.2 (NGFF)
Dimensions 42x32x2.7 mm

Required connectors

Here is the description about the connectors used to integrate the modem into the host
device.

U.FL #2

U.FL #1

U.FL #1 : LTE Main Port
U.FL #2 : LTE Diversity Port

M.2 (NGFF) Connector

RF Bands

The LTE frequency bands the modem supports

LTE Uplink Downlink

Band 13

777 MHz ~ 787 MHz 746 MHz ~ 756 MHz

Shielding

The module is fully shielded to protect against EMI and must not be removed.

Determining the antenna's location

When deciding where to put the antennas:
‧Antenna location may affect RF performance. Although the module is shielded to prevent

interference in most applications, the placement of the antenna is still very important—if the
host device is insufficiently shielded, high levels of broadband or spurious noise can

degrade the module's performance.

‧Connecting cables between the module and the antenna must have 50 ohm impedance. If

the impedance of the module is mismatched, RF performance is reduced significantly.
‧Antenna cables should be routed, if possible, away from noise sources (switching power

supplies, LCD assemblies, etc.). If the cables are near the noise sources, the noise may be
coupled into the RF cable and into the antenna.

Ground connection

When connecting the module to system ground:
‧Prevent noise leakage by establishing a very good ground connection to the module

through the host connector.

‧Connect to system ground using the two mounting holes at the top of the module.
‧Minimize ground noise leakage into the RF.

Depending on the host board design, noise could potentially be coupled to the module from
the host board. This is mainly an issue for host designs that have signals traveling along
the length of the module, or circuitry operating at both ends of the module interconnects.

Interference from other wireless devices

Wireless devices operating inside the host device can cause interference that affects the
module.
To determine the most suitable locations for antennas on your host device, evaluate each
wireless device's radio system, considering the following:
‧Any harmonics, sub-harmonics, or cross-products of signals generated by wireless

devices that fall in the module's Rx range may cause spurious response, resulting in
decreased Rx performance.

‧The Tx power and corresponding broadband noise of other wireless devices may overload

or increase the noise floor of the module's receiver, resulting in Rx desense.
The severity of this interference depends on the closeness of the other antennas to the
module's antenna. To determine suitable locations for each wireless device's antenna,
thoroughly evaluate your host device's design.

Host-generated RF interference

All electronic computing devices generate RF interference that can negatively affect the
receive sensitivity of the module.?
Proximity of host electronics to the antenna in wireless devices can contribute to decreased
Rx performance. Components that are most likely to cause this include: