Planar RF Passive Integration on Insulating Substrate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional RF module manufacturing methods are complex and costly, leading to high production expenses and reliability issues due to the need for multiple layers and procedures, which complicates the integration of passive devices and increases the risk of thermal expansion and skin effect-related device deterioration.
Innovation Solution
The solution involves forming capacitors and inductors directly on an insulating substrate with a simpler structure, using a plating process to create connecting lines and pads, thereby reducing the complexity and cost of production while enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive devices are formed between layers of multi-layer substrates made of LTCC, then device integration is achieved, but production costs increase and design complexity increases
Solution Approach 1:
The patent transitions from three-dimensional multi-layer substrate integration to two-dimensional planar integration on a single substrate. Passive devices are formed on the substrate surface with interconnections routed in the same plane, eliminating the need for multiple stacked layers and complex vertical interlayer routing.
Solution Approach 2:
The patent combines passive devices, interconnections, and substrate functions into a single integrated structure. The substrate itself serves as both the mechanical support and the interconnection medium, merging functions that were previously separated across multiple layers.
2Volume of moving object
If a larger number of layers are prepared for smaller devices, then device size decreases, but production costs increase
Solution Approach 1:
The patent achieves miniaturization through planar layout optimization rather than vertical stacking. By utilizing the substrate surface area efficiently with spiral inductors and compact capacitor designs, the device achieves small footprint without requiring multiple costly layers.
3Adaptability or versatility
If processing using thick dielectric film is performed two or more times with plating procedures, then passive devices are formed, but manufacturing complexity increases and processing condition stability decreases
Solution Approach 1:
The patent forms all passive devices and interconnections in a single planar processing step before final substrate completion. This preliminary formation of all conductive elements eliminates subsequent plating and dielectric deposition steps that would otherwise be required for multi-layer construction.
4Volume of moving object
If a thin, multi-layer dielectric film is used, then device size decreases, but substrate bending occurs due to thermal expansion coefficient difference
Solution Approach 1:
The patent eliminates the multi-layer stacked structure that causes thermal mismatch bending by transitioning to a planar single-layer configuration. All components are formed on the same substrate plane, eliminating the thermal expansion differential between stacked layers that causes warping.
5Adaptability or versatility
If thin-film metal film formed by sputtering or vapor deposition is used for lines, then device integration is achieved, but resistance increases due to skin effect
Solution Approach 1:
The patent changes the conductor formation method from thin-film deposition to thick-film plating. This parameter change in manufacturing technique produces substantially thicker conductive traces that reduce the skin effect, thereby lowering resistance and improving RF performance while maintaining integration.
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 results in a more reliable and cost-effective electronic device with improved thermal stability and reduced production costs, as it simplifies the manufacturing process and minimizes the number of layers required, thus addressing the limitations of conventional methods.
Implementation Method 1
using a plating process to create connecting lines and pads
Data Source
AI summary
An electronic device includes: an insulating substrate; at least one capacitor and an inductor that are formed directly on the insulating substrate; a line that connects the capacitor and the inductor from the above; and an external connecting pad unit that is made of the same conductor as the line and is disposed on the insulating substrate.