Ground plane 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.

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