Antenna Structures on Molded Plastic Packages
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Solution Overview
Problem
In compact electronic devices, it is challenging to efficiently mount components and incorporate antennas without consuming excessive space, as existing signal routing paths and mounting structures are often inefficient, and complex housing geometries can interfere with electrical components.
Innovation Solution
The use of molded plastic with laser-sensitizable material to form antenna structures, including metal foil and flexible printed circuit substrate materials, which are electroplated on exposed surfaces, allowing for the creation of antenna structures like inverted-F antennas that can be integrated into system-in-package devices without occupying excessive space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional signal routing paths and mounting structures are used, then components can be mounted on the substrate, but they consume excessive space and interfere with antenna integration
Solution Approach 1:
The patent combines the antenna structure with the molded plastic package itself, eliminating the need for separate mounting structures. The antenna is formed directly on the plastic surface through laser sensitization and metal deposition, merging the package housing and antenna into a single integrated component, thereby reducing space consumption while maintaining manufacturing feasibility
Solution Approach 2:
The patent transitions from planar PCB-mounted antennas to three-dimensional integration by forming antenna structures directly on the molded plastic package surface. This allows the antenna to utilize the vertical dimension and package geometry, reducing the footprint area while maintaining electrical functionality
2Adaptability or versatility
If antennas are incorporated into compact devices, then wireless functionality is achieved, but they interfere with other electrical components
Solution Approach 1:
The patent applies local quality by forming the antenna structure on specific regions of the molded plastic package using laser sensitization. The laser selectively activates only the areas where metal traces are needed, creating localized antenna patterns that are spatially separated from sensitive electronic components, thereby reducing interference while maintaining wireless functionality
Solution Approach 2:
The molded plastic package acts as an intermediary between the electronic components and the antenna function. The plastic substrate provides electrical isolation and mechanical support, allowing the antenna to be integrated without direct contact with sensitive components, thereby reducing harmful electromagnetic interference while enabling wireless capability
3Adaptability or versatility
If laser-sensitizable plastic material is used with electroplating, then antenna structures are formed on molded plastic, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by incorporating laser-sensitizable material into the molded plastic during the initial packaging process. This pre-preparation allows subsequent antenna formation to proceed through a simplified single-step laser activation and metal deposition process, rather than requiring multiple complex fabrication steps, thereby reducing overall manufacturing complexity while enabling antenna structure formation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the efficient integration of antennas within compact electronic devices by utilizing molded plastic to support antenna structures, optimizing space usage and avoiding interference with other components, thereby enhancing the packaging efficiency of system-in-package devices.
Implementation Method 1
The metal traces may be electroplated metal traces that are formed on regions of a laser-sensitizable plastic material that have been exposed to laser light
Implementation Method 2
The metal traces may be electroplated metal traces that are formed on regions of a laser-sensitizable plastic material that have been exposed to laser light
Data Source
AI summary
A packaged device may include electrical components such as integrated circuits that are mounted to a substrate such as a printed circuit substrate. Plastic may be molded to the printed circuit substrate over the integrated circuits. The molded plastic may include one or more shots of plastic and may include laser-sensitizable plastic material. Antenna structures may be supported by molded plastic such as molded plastic in a packaged device. The antenna structures may be formed from metal foil, flexible printed circuit substrate material with metal antenna traces, and metal traces that are formed on exposed surfaces of the plastic. The metal traces may be electroplated metal traces that are formed on regions of a laser-sensitizable plastic material that have been exposed to laser light. A package may have a protrusion that supports an antenna structure.