RK3288 Hardware Design Guide
Fig 22-5
Because of the large interference by EMC of switching power supply. Please keep the
power traces and other high-speed signals away from the antenna area.
The shield cover needs to be added to PCB if there isn’t a shield cover in the module,
and the module should be surrounded by a complete GND, as shown in Fig 22-6.
Fig 22-6
Impedance should be considered in the design of the width of 3G antenna and
microstrip, the impedance requirement is Z=50±10ohm. Under the traces, a
complete reference plane is needed to serve as a reference GND to RF signal.
The longer 3G trace is, the greater energy lose. Therefore the length of antenna is as
shorter as possible in the design of RF antenna, and branches are not allowed, as
shown in Fig 22-6.
The radiation energy of antenna is very large. Note that the antenna won’t interfere
with the sensitive devices and signals, such as DDR, FB of DCDC.
If the 3G trace needs to turn, arc trace is used instead of corner trace, as shown in the
Fig 22-7.
Summary of Contents for RK32 Series
Page 1: ...RK3288 Hardware Design Guide RK3288 Hardware Design Guide Revision 1 2 Jun 18 2014...
Page 2: ...RK3288 Hardware Design Guide Revision History Date Revision Description 2014 12 15 1 2...
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