Overmolded Package Antenna Integration on Mold Compound
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Solution Overview
Problem
Conventional methods for incorporating antennas in mobile communication devices, such as cell phones, either consume valuable space on printed circuit boards or incur additional assembly costs due to external antenna assembly.
Innovation Solution
An overmolded semiconductor package with an integrated antenna, where the antenna is formed on a conductive layer within a mold compound, providing an accessible antenna input on the package's outer surface or on a support structure, thus avoiding space consumption and assembly costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an antenna is fabricated on a main printed circuit board, then the fabrication cost is low, but valuable area on the main printed circuit board is consumed
Solution Approach 1:
The antenna is moved from the two-dimensional plane of the printed circuit board to the three-dimensional exterior surface of the overmolded package. This dimensional transition allows the antenna to utilize the package's outer surface area, thereby preserving the printed circuit board area while maintaining low fabrication costs through integration into the molding process.
Solution Approach 2:
The antenna is embedded within the overmolded package structure, with the conductive layer and antenna elements being encapsulated by the mold compound. This nesting approach integrates the antenna into the package itself, eliminating the need for separate board space while keeping the overall package compact.
2Adaptability or versatility
If an antenna is formed by extending a wire along the inside edge of a mobile communication device and soldering the wire to a module, then the antenna can be implemented, but additional assembly cost is incurred
Solution Approach 1:
The antenna fabrication process is merged with the overmolded package manufacturing process. The conductive layer is deposited and the antenna is formed on the mold compound surface during the same molding operation, eliminating separate wire extension and soldering assembly steps, thereby reducing assembly costs while maintaining implementation flexibility.
Solution Approach 2:
The overmolded package structure itself provides the antenna support and mounting functionality. The mold compound serves dual purposes as both package encapsulation material and antenna substrate, eliminating the need for external wire extensions and separate mounting hardware, thereby reducing assembly complexity and cost.
3Area of stationary object
If an integrated antenna is formed on a conductive layer within a mold compound, then space consumption is avoided and assembly costs are reduced, but the antenna input must be accessible on the package outer surface
Solution Approach 1:
The antenna input connection point is extracted and brought to the exterior surface of the overmolded package through the feed line structure. The feed line penetrates or exits the mold compound surface, providing accessible connection points for antenna cables while keeping the antenna elements integrated within the package, thereby balancing space efficiency with operational accessibility.
Data Source
AI summary
According to an exemplary embodiment, an overmolded semiconductor package includes at least one semiconductor die situated over a package substrate. The overmolded semiconductor package further includes a mold compound overlying the at least one semiconductor die and the package substrate. The overmolded semiconductor package further includes a conductive layer situated on an outer surface of the mold compound and having an opening. The overmolded semiconductor package further includes an antenna feed line situated in the mold compound and having a portion exposed in the opening in the conductive layer, thereby providing an antenna input on the outer surface of the mold compound.