本文分二部份，第一部分藉由ANSYS有限元素軟體來分析針狀鰭片之組合，探討散熱鰭片在基底面積為25x25mm2時，不同組合、高度、大小及基底高度之變化，來了解針狀散熱鰭片之最佳設計。由分析結果可知鰭片在6x6之組合下，具有較佳之散熱效益。亦發現散熱鰭片高度在10mm以上，其散熱效益並沒有顯著之增加。當散熱鰭片高度固定15mm時，基底厚度之變化並無法顯著的增加其散熱效益。第二部份利用時域有限差分法(FDTD)來探討散熱鰭片對電磁波之吸收及輻射能力，當發射訊號由模擬之電子元件外緣發射，散熱鰭片組合在2x2及3x3具有較顯著之共振現象，且其共振點之能量會隨發射頻率增大而增加，但當發射頻率增至10GHz時，由於高頻共振點增加，分散了各共振點的能量，使得各共振點之能量變小。且不管發射訊號是由模擬之電子元件外緣或內緣發射,模擬之電子元件內部或外部訊號均會產生顯著之共振現象。此共振現象會隨著發射訊號之頻率增大，而往高頻之方向移動，並且將能量分散於各共振點上。

　　The study has two parts. The first part is on the effects of the pin-fin geometries on the thermal performance of fins by ANSYS finite element software simulation. The simulated results indicate that when the with the pin-fin configuration of 6x6, the fin has better thermal performance. Furthermore, when the height of the heat sink is above 10mm, no better thermal performance can be obtained. When the height of the pin-fin is fixed at 15mm, the thermal performance can not be improved by the variation of the base thickness of the heat sink. The second part concentrates on the effects of the pin-fin geometries on the fin’s ability to absorb or radiate electromagnetic waves by finite difference time domain (FDTD) numerical method. When the excitation source is external to the simulated electronic device, the electromagnetic wave exhibits resonance phenomena for the 2x2 and 3x3 pin-fin configuration. The energy of the resonance increases first as the excitation increases. But, at 10GHz excitation frequency, the resonance energy decreases by spreading to more resonance points. The resonance phenomena always occur despite of the location of the excitation source, either inside or outside the electronic device. The spreading of energy to more resonant frequencies is also observed when the excitation source is situated inside the electronic device even though the level is less significant.

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