What can be added to a circuit to reduce electromagnetic

Answer

Using a good circuit board PCB design and shielding techniques

Explanation

EMI is a disruptive electromagnetic energy that is released by one portion of the circuit and reaches other parts of the circuit via conducted or radiated parts. The energy can affect circuit performance or even damage brain cells when high. It is possible to reduce this effect by employing the method of shielding and ground planes to prevent interference with wireless system operations.