Air Gap Inductor Conductors Using Energy Evaporation Material
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Solution Overview
Problem
Inductor parasitic losses in RF and microwave circuits are high, leading to suboptimal performance due to low Q values, which are not adequately minimized by existing technologies.
Innovation Solution
An integrated circuit structure is formed with an air gap between inductor lines by using an energy-reactive material that evaporates upon energy application, creating a void surrounded by insulator and conductor materials for mechanical support, thereby reducing parasitic losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductors are designed for high Q and inductance value, then performance in RF and microwave circuits is improved, but parasitic losses increase
Solution Approach 1:
The patent extracts the harmful parasitic capacitance effect by introducing air gaps between adjacent inductor lines. The energy-reactive material is selectively removed to create voids that eliminate the parasitic coupling, directly addressing the energy loss problem while preserving the inductor's high Q performance.
Solution Approach 2:
The patent uses a porous material layer containing energy-reactive material that is subsequently removed to form air gaps. This porous structure allows for precise control of the air gap formation process, enabling the creation of voids between inductor lines that reduce parasitic losses without compromising the overall inductor structure.
2Loss of energy
If air gaps are formed between inductor lines, then parasitic losses are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines the air gap formation process with the existing inductor fabrication sequence. The energy-reactive material is deposited as part of the standard manufacturing process, and its selective removal occurs at an appropriate stage, integrating the parasitic reduction feature without requiring completely separate manufacturing steps.
Solution Approach 2:
The energy-reactive material serves as an intermediary that facilitates air gap formation. It is deposited in specific patterns, then selectively removed to create the desired air gaps. This intermediary approach allows for controlled void formation without directly complex machining or assembly steps.
3Reliability
If energy-reactive material is used to create air gaps, then Q value is enhanced, but material removal precision must be high
Solution Approach 1:
The patent applies local quality by using a porous material layer with energy-reactive material in specific locations between inductor lines. The material is selectively removed only where air gaps are needed, preserving the inductor structure elsewhere. This localized approach ensures high precision void formation exactly where required for parasitic reduction.
Solution Approach 2:
The energy-reactive material undergoes phase transition from solid to vapor/removed state through energy application (such as laser or thermal processing). This phase change mechanism enables clean, precise removal of the material to form air gaps with well-defined boundaries, achieving the required manufacturing precision for Q value enhancement.
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
The approach effectively minimizes parasitic losses and enhances the Q value of inductors, achieving high performance in RF and microwave circuits by forming air gaps between inductor lines.
Implementation Method 1
The energy-reactive material portion evaporates upon application of energy during manufacturing
Data Source
AI summary
A first layer on a substrate includes an insulator material portion adjacent an energy-reactive material portion. The energy-reactive material portion evaporates upon application of energy during manufacturing. Processing patterns the first layer to include recesses extending to the substrate in at least the energy-reactive material portion. The recesses are filled with a conductor material, and a porous material layer is formed on the first layer and on the conductor material. Energy is applied to the porous material layer to: cause the energy to pass through the porous material layer and reach the energy-reactive material portion; cause the energy-reactive material portion to evaporate; and fully remove the energy-reactive material portion from an area between the substrate and the porous material layer, and this leaves a void between the substrate and the porous material layer and adjacent to the conductor material.