Multilayer Balun Using 3D Stacked Transmission Lines
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Solution Overview
Problem
Existing baluns, such as those described in JP 2004-056799A, face challenges in miniaturization due to occupying large areas and experiencing unwanted coupling issues, which affect their amplitude and phase balance characteristics over a wide frequency band, especially in mobile communication systems that require wider bandwidth and smaller form factors.
Innovation Solution
A multilayer electronic component with a balun is designed using a stack of dielectric and conductor layers, where the balun includes electromagnetically coupled transmission lines arranged in different regions of the stack to enhance line-to-line capacitance, preventing unwanted coupling and allowing for miniaturization while maintaining good amplitude and phase balance characteristics over a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all coupling lines are located on the same surface of a semiconductor substrate, then the balun can be formed with a simple structure, but the balun occupies a large area and is difficult to miniaturize
Solution Approach 1:
The patent transitions from a two-dimensional planar layout to a three-dimensional stacked configuration. Specifically, the first and second coupling lines are arranged on different surfaces (first surface and second surface) of the semiconductor substrate, utilizing the vertical dimension to reduce the horizontal area occupied by the balun structure while maintaining the necessary electrical connections and coupling characteristics.
2Area of moving object
If the balun is miniaturized by placing lines closer together, then the area is reduced, but unwanted coupling between lines is generated affecting amplitude and phase balance characteristics
Solution Approach 1:
By distributing coupling lines across multiple surfaces and utilizing vertical stacking, the patent increases the effective separation distance between lines that should not be coupled. This spatial arrangement in three dimensions allows for miniaturization while preventing unwanted coupling by ensuring that non-coupled lines are separated by substrate thickness and vertical distance, thereby maintaining amplitude and phase balance characteristics.
Solution Approach 2:
The patent segments the coupling lines into different groups located on different surfaces. The first coupling line and third coupling line are on the first surface, while the second coupling line and fourth coupling line are on the second surface. This segmentation allows controlled coupling between specific lines (first with second, third with fourth) while preventing unwanted coupling between lines on different surfaces, thus maintaining signal integrity in a compact form.
3Adaptability or versatility
If two Marchand baluns are connected in parallel to increase bandwidth, then the frequency band is widened, but the device occupies more area and becomes more complex
Solution Approach 1:
The patent merges multiple coupling lines (first, second, third, and fourth coupling lines) into a single integrated balun structure by arranging them on different surfaces of the same semiconductor substrate. This consolidation achieves the bandwidth extension effect of parallel Marchand baluns while reducing the overall area compared to discrete parallel configurations, as all lines share common input and output terminals and utilize the vertical space of the substrate.
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 solution enables the balun to exhibit excellent amplitude and phase balance characteristics up to higher frequencies, supporting wider bandwidth requirements and allowing for the miniaturization of the multilayer electronic component, thus addressing the limitations of previous designs.
Implementation Method 1
The first balanced transmission line and the second balanced transmission line are configured to be electromagnetically coupled to the first line portion
Implementation Method 2
The third balanced transmission line and the fourth balanced transmission line are configured to be electromagnetically coupled to the second line portion
Implementation Method 3
enhance line-to-line capacitance, preventing unwanted coupling
Implementation Method 4
a plurality of dielectric layers and a plurality of conductor layers stacked on each other
Data Source
AI summary
A multilayer electronic component includes a stack and a balun. The stack includes a plurality of stacked dielectric layers and conductor layers. The balun is formed using the stack. The balun includes an unbalanced transmission line and first to fourth balanced transmission lines. The unbalanced transmission line includes a first line portion and a second line portion connected in series. The first and second balanced transmission lines are configured to be electromagnetically coupled to the first line portion. The third and fourth balanced transmission lines are configured to be electromagnetically coupled to the second line portion.