Radiated Noise Measurement from Multiple LED Lights Using Reverberation Chamber

In this study, the total radiated noise power from multiple LED lights was investigated using a reverberation chamber. The frequency spectrum of the total radiated noise power varied depending on the position of the LED lights on the duct rail. We also observed that the power spectrum of the noise did not show a linear increase with an increasing number of LED lights. This may be attributed to the increased number of reflection and transmission points on the duct rails, which causes noise currents to resonate on the duct rails and complicates the distribution of noise current. We then evaluated the band power of the total radiated noise across different frequency ranges to estimate the noise power contained within the bandwidth of various wireless systems that may be susceptible to interference. The spectral density of the total radiated noise power was integrated over various frequency ranges, and the variation in the band power of the total radiated noise was compared to the number of LED lights. When integrated over a certain frequency range, the band power of the total radiated noise shows a linear increase with the number of LED lights. From the above, it can be concluded that the radiated LED noise shows a cumulative effect proportional to the number of LED lights when the noise power is integrated both over all radiating directions and over a certain frequency range.