DocID025260 Rev 1

11/14

AN4356

Solution to avoid antenna desense

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These trials have been done on the USB2.0 interface, but the same issues could be

encountered on another links such as MIPI D-PHY, Display Port, MHL, HDMI, USB3.0, SD

Card… related to the various Rx frequencies found in mobile equipments:

•

GPS

•

WLAN

•

Bluetooth

•

TV

A proper choice of ECMF device could help solve these kinds of problems.

The better place for the ECMF device is as close as possible to the connectors for the

external links, and close to the connector flex for internal ones. For long flex, one ECMF at

each end will be more efficient.