Which is an EMI suppression technique?

• A. Cutting transmitting antennas to the correct frequency
• B. Limiting bandwidth
• C. Using magnetic shielding
• D. Using electronic filtering networks

Answer: (D)

EMI suppression is achieved by attenuating unwanted frequencies in the signal path. Using electronic filtering networks provides direct, targeted attenuation of disruptive frequencies while letting the desired signal pass. Filters can be designed as low-pass, high-pass, band-pass, or notch configurations to target specific interference without compromising normal operation, making them a versatile and effective solution for reducing both emissions and susceptibility.

Other options don’t address EMI as directly. Limiting bandwidth reduces the range of frequencies that could interfere but also restricts system capability. Magnetic shielding helps block some EMI but isn’t as universally applicable to the signal path as filtering. Cutting transmitting antennas to the correct frequency changes where the signal goes rather than suppressing interference itself.