Akademik Veri Yönetim Sistemi
3rd International Symposium on Multidisciplinary Studies and Innovative Technologies, ISMSIT 2019, Ankara, Türkiye, 11 - 13 Ekim 2019, (Tam Metin Bildiri)
Heatsinks are recently popular due to their benefit to keep the temperature of the electronic device and PCB/ICs in a certain range. Heatsinks are used both to thermally perform a maximum cooling and to have a minimum of the electromagnetic radiation since it causes undesirable electromagnetic interference (EMI) in devices around. Especially in devices operating at high frequencies, these structures behave antennas if their electrical dimensions are comparable to λ-λ20 wavelengths. In this paper, we compare the electromagnetic characteristics (reflection coefficient, radiated emission, and E-field distribution) of the heatsinks with the same height, base, width, length, and thickness depending on the different fin types at 2-8 GHz (S-C band) frequency range. The heatsinks behave as both a monopole antenna and a patch antenna and the cut-off frequencies of monopole and patch antenna vary depending on the height and maximum base length, respectively. In the range of 2-3.4 GHz, 4.7-5.6 GHz, 5.6-6.15 GHz, and 6.15-6.85 GHz, heatsinks with pin fin types should be preferred to reduce EMI effects from heatsinks instead of plate fins. However, for 6.15-6.85 GHz, it is better to use pin fins types. For the other frequency regions anyone can be preferred. Also the heatsink with plate-fin, in the ranges of 2-2.3 GHz, 3.6-5.6 GHz, 6.7-7.25 GHz, and 7.45-7.65 GHz should be located as horizontal. But, the one with parabola-plate fin, for 2.3-3.8 GHz, 5.6-6.6 GHz, and 7.4-8 GHz should be located as vertical.