Self-Aligned Waveguide Design for Precise Semiconductor Alignment
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Summary
Problems
Automotive radar systems in vehicles require precise alignment of semiconductor devices with waveguides for optimal performance, but existing methods are costly and lack precision, impacting vehicle safety and cost-effectiveness.
Innovation solutions
A self-aligned waveguide structure is achieved by forming alignment features on the semiconductor device and waveguide, allowing solder material to align the waveguide with signal launchers during a reflow process, ensuring precise alignment and assembly.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If traditional alignment methods are used for waveguide and semiconductor device assembly, then manufacturing cost is reduced, but alignment precision deteriorates
Why choose this principle:
The solder material serves a dual function: it bonds the waveguide structure to the semiconductor device while simultaneously acting as an alignment mechanism. During the reflow process, the molten solder flows to fill gaps and wet the alignment features, causing the waveguide to self-align with the signal launchers without requiring external alignment equipment or complex positioning mechanisms.
Principle concept:
If traditional alignment methods are used for waveguide and semiconductor device assembly, then manufacturing cost is reduced, but alignment precision deteriorates
Why choose this principle:
The alignment process exploits the change in physical state of the solder material from solid to liquid during reflow. In the liquid state, the solder flows and wets the alignment features, enabling self-alignment. After cooling and solidification, the solder maintains the precise alignment achieved during the liquid phase, locking the waveguide in its correctly positioned state.
Application Domain
Data Source
AI summary:
A self-aligned waveguide structure is achieved by forming alignment features on the semiconductor device and waveguide, allowing solder material to align the waveguide with signal launchers during a reflow process, ensuring precise alignment and assembly.
Abstract
A method of forming a self-aligned waveguide is provided. The method includes forming a first alignment feature on a packaged semiconductor device and a second alignment feature on a waveguide structure. A solder material is applied to the first alignment feature or the second alignment feature. The waveguide structure is placed onto the packaged semiconductor device such that the second alignment feature overlaps the first alignment feature. The solder material is reflowed to cause the waveguide structure to align with the packaged semiconductor device.