Automotive AM-band radiated emission mitigation techniques, a practical approach

Radiated emission (RE) compliance requirements of automotive sector demands one of the most difficult design challenges for EMC engineers as compared with those of FCC and military standard mandates. Recent revisions to EMC requirements has exasperated the RE compliance levels considerably. Automotive industry radiated emission requirements span over a wide frequency range (150 kHz-1.583 GHz). The European Long Wave (150 kHz-280 kHz) and global Medium Wave AM band (0.53 MHz-1.7 MHz) is the subject of this article. Onboard receivers in modern vehicle intended for the reception of the RF services, indicated as low frequency LW and MW audio broadcast, can be susceptible to unintended noise source(s). The modern vehicle is abundantly rich in noise source with a large number of electrical and electronics components. As a result of integration of electronics in modern vehicle, it hence creates the most demanding electromagnetic environment.