Akademik Veri Yönetim Sistemi
IETE JOURNAL OF RESEARCH, cilt.69, sa.6, ss.3550-3560, 2023 (SCI-Expanded)
The active/passive heatsinks have recently garnered much attention due to their benefit to keep the temperature of the electronic device and PCB/ICs in a certain range. They are expected both to perform a maximum cooling thermally and to have a minimum of the radiation in electromagnetic terms since it causes electromagnetic interference (EMI) in devices around. In this paper, many studies discussing the EMI performance of natural convection heatsinks in the literature are investigated. Especially in devices operating at high frequencies, these structures behave like semi-antennas if their electrical dimensions are comparable to lambda-lambda/20 wavelengths. Accordingly, they act as both a monopole and a patch antenna. To eliminate the EMI effect from a heatsink, the grounding, shielding, and filtering techniques are studied. In the literature, the grounding methods are studied up to 2 GHz and it is determined that it provides improvement up to 12 dB. For 1-40 GHz it is possible to have up to 20 dB improvements in EMI by using absorbers and shielding methods. Finally, the effects of heatsink geometry, design parameters, fin-types, and excitation points on RE are discussed.