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Ground plane in pcb !

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ground planes in pcb

Power planes:
The use of “power planes” is fairly common on multilayer PCBs with digital circuitry. A separate area or plane of copper is connected to each supply rail. Components are connected to the DC supply by simply connecting to the power plane using a via hole through the PCB.
Multiple vias can be used for higher current devices.
This approach can, however, be disastrous if used on the RF sections of a PCB. The power planes tend to act as patch antennas and spurious signals can find their way all over the PCB. The safest way to approach DC power distribution on an RF PCB is through the use of adequate width traces to provide the required current capacity and RF decoupling capacitors physically close to each active device.
Click to expand...

Quoted from:
"Minimizing RF PCB electromagnetic emissions"
**broken link removed**

Regards,
IanP
 

Actually not .. power and ground planes are two different things ..
Power routing with a star topology, and proper decoupling of the power(Vcc) pins will help achieve the best RF performance possible ..

However, a single solid ground plane in a multi-layer stack-up board works well. The general rule is to avoid cross-interference by using a ground plane to shield the RF section from other circuitry in the board ..

On the other hand, there are no unique solutions to ground distribution in RF board design. Split ground planes or split traces can be utilized to separate analog and digital signals or to isolate high-current or high-heatgenerating sections ..

Regards,
IanP
 

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