Sometimes, when you buy a new electronic gadget, it doesn’t meet its expectations. You might blame it on many things that might go wrong with the device, but generally, it is due to the PCB or the Printed Circuit Board. PCB is that part that mechanically supports the device and connects it electrically. However, PCB is not the only thing that might go wrong with your gadget; there is also the factor of EMI or Electromagnetic Interference. EMI or electromagnetic interference is disruptive energy emitted from every other electronic device.
Now, let’s see how EMI disrupts the performance of a gadget. In today’s world, most systems are wireless; hence, the internal wires all receive radio signals or some other type of signals and transmit them. These signals cumulatively disrupt the gadget’s overall functioning, giving rise to EMI or Electromagnetic Interference. To avoid this, a device needs a smart design of the PCB and a shielding solution that will help the device be saved from the EMI of other devices. A shielding solution protects the device from receiving spurious signals from different devices and, hence, enables the machine run on a better performance scale.
EMI Shielding: An Integral Part of PCB Design
Most of the devices we use today, smartphones, tablets, and televisions, all emit EMI or Electromagnetic Interference generally from two sources: RF or Radio Frequency, which transmits the signal from the gadget, and the other is the device’s internal circuits. In the modern-day, the main challenge that a designer faces in manufacturing a device is to design a PCB that will not emit EMI. Once the PCB is created, the next thing that designers have to work on is shielding the other parts of the gadget to protect it from electromagnetic interference from different devices.
Shielding Varieties
Electronic gadgets use many types of shields to protect them from EMI or Electromagnetic Interference. Every device does not have to be installed with the same shielding, which is why there are six types of shielding. Now, circuit board shields are also generally available in many sizes and shapes. They can also comprise various metals, ranging from stainless steel to conductive foams and metal films. The shields used for PCB are very sophisticated and have electrically conductive interfaces, which makes these shields more effective and helps the gadget function more smoothly.
In ideal cases, EMI shields should have a sealed container with no minute openings. But in practicality, achieving that is impossible, so leaking generally happens from these openings in the EMI shields. For this, preventive measures need to be taken. EMI shields cannot be in a sealed container since many wires go in and come out, and hence, there would be openings, no matter what.
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