User's Manual

LTE Module
EC20 Hardware Design
EC20_Hardware_Design Confidential / Released 48 / 83
4.3. Layout Guideline
The following layout guideline should be taken into account in your design.
 Maximize the distance between the GNSS antenna, the main antenna and Rx-diversity antenna.
 Noisy digital circuits such as the USIM card, USB interface, Camera module, Display connector and
SD card should be away from the antenna.
 Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar
isolation and protection.
 Keep 50ohm characteristic impedance of the ANT_GNSS trace.
Refer to Chapter 5 for GNSS reference design and antenna consideration.