Laser-Activated Plastic Foam Antenna Carriers
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Solution Overview
Problem
Forming electronic device antenna structures with desired attributes is challenging due to the influence of conductive housing structures and device size constraints, particularly in compact devices where antenna performance is compromised.
Innovation Solution
The use of a dielectric antenna carrier formed by molding a layer of plastic onto a foam member with a low dielectric constant, where metal traces are electroplated onto selectively exposed areas using laser direct structuring, allowing for the creation of compact antenna structures that minimize size and optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional antenna structures are used in compact devices with conductive housing, then device size is reduced, but antenna performance deteriorates due to interference from housing structures
Solution Approach 1:
A foam member with low dielectric constant is introduced as an intermediary between the antenna and the conductive housing structure. This foam carrier isolates the antenna from the interfering conductive housing, maintaining antenna performance while enabling compact device design. The foam member acts as a mediator that prevents harmful electromagnetic interactions between the antenna and housing structures.
2Strength
If adhesive is used to attach plastic layer to foam member, then attachment strength is improved, but manufacturing complexity and environmental impact worsen
Solution Approach 1:
The adhesive layer is completely removed from the antenna structure. Instead of using adhesive to bond the plastic layer to the foam member, the patent employs a laser-activated plastic layer that directly bonds to the foam surface through laser irradiation. This extraction of the adhesive eliminates an additional manufacturing step and material layer, simplifying the overall structure and manufacturing process while maintaining strong attachment.
Solution Approach 2:
The mechanical adhesive bonding system is replaced with a laser-activated chemical bonding system. The plastic layer contains additives that sensitize it to laser light, and when irradiated, these additives enable direct bonding between the plastic and foam surfaces. This substitution eliminates the need for separate adhesive application and curing steps, reducing manufacturing complexity.
3Manufacturing precision
If laser direct structuring is used to form metal traces, then manufacturing precision is improved, but manufacturing complexity increases
Solution Approach 1:
The laser direct structuring process combines multiple operations into a single step: the laser irradiation simultaneously activates the plastic layer and initiates metal trace formation through the sensitizing additives. This merging of the activation and metal deposition processes achieves high manufacturing precision for the antenna traces while avoiding the need for separate patterning steps that would increase manufacturing complexity.
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 enhances antenna performance by minimizing power loss and stabilizing the antenna's shape, enabling efficient wireless communication in compact electronic devices without the need for adhesives and allowing for complex shapes and recesses in the antenna design.
Implementation Method 1
A laser may be used to selectively expose portions of the plastic layer to laser light. The plastic layer may include additives that sensitize the plastic layer to light exposure.
Implementation Method 2
Electroplated metal traces for the antenna may be formed on the exposed portions of the plastic layer
Data Source
AI summary
An electronic device may be provided with wireless circuitry that includes antennas. An antenna may be formed from metal traces on a dielectric antenna carrier. The antenna carrier may be formed by molding a layer of plastic onto the surface of a foam member. The foam member may have a low dielectric constant to enhance antenna performance and may be formed from a stiff closed cell plastic foam material. Heat and pressure may be used to attach the layer of plastic to the surface of the foam member without adhesive. A laser may be used to selectively expose portions of the plastic layer to laser light. The plastic layer may include additives that sensitize the plastic layer to light exposure. Electroplated metal traces for the antenna may be formed on the exposed portions of the plastic layer while leaving other portions of the plastic layer uncovered with metal.