Image Number 6 for United States Patent #6296048.
A heat sink assembly for an electronics assembly, such as an RF power amplifier, includes a pallet, a fin structure, and a hollow base separate from the fin structure. The fin structure may be an integral curved sheet or a modular apparatus comprising a plurality of inverted U-shaped fin modules. Top horizontal walls of the fin structure directly contact a bottom surface of the pallet. Vertical fins of the fin structure are inserted through the slots of the base. The pallet, fin structure and base are coupled together such that the upper surface of the base applies load to the contact portions of the fin structure sandwiched between the base and the pallet. Methods for assembling a power amplifier and manufacturing a heat sink assembly are also provided.