Research Information System
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, vol.35, no.16, pp.2153-2162, 2021 (SCI-Expanded)
High-speed switching capabilities of modern ICs cause generating more heat, and it must be ejected via metallic heat-sinks behaving as an antenna at certain frequencies. Having different radiation patterns(RP) at different frequencies may ca use a malfunction on nearby electronics placed on the other part of PCB. In this study, 50W equivalent heat-sink is investigated at 2-8 GHz in terms of feeding point. RP measurements and simulation results at four different feeding points are discussed, and it is observed that point of feeding is the pre-dominant factor of RP. As expected, the feeding of the heat-sinks from the center is to be preferred for lower frequencies, but it causes critical emission/interference problems at higher frequencies. As the frequency increases, it metamorphoses like a frog forming. While it behaves as an omnidirectional antenna having (similar to 2 dB) gain at 2GHz, RP turns to one that includes 6 beams with 30-degree beam-widths and (similar to 5 dB) gain.