Meandering Transmission Line Layout for Compact Passive Components
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Solution Overview
Problem
Existing passive components, such as hybrid couplers, are inefficient in terms of space usage, increasing costs and making integration into integrated circuits difficult due to the required space for straight transmission lines.
Innovation Solution
A passive component with a meandering transmission line arrangement that is symmetrical about at least one axis, minimizing surface area by using four transmission lines with the same length and following indirect paths, reducing the overall size while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If straight transmission lines are used to connect ports, then signal transmission is simple and direct, but the surface area occupied is large
Solution Approach 1:
The patent applies curvature by replacing straight transmission lines with meandering paths that include curves and bends. The transmission lines follow serpentine routes between ports instead of direct straight lines, allowing the signal to travel the required electrical length while occupying significantly less planar surface area. This curved path design is the core geometric transformation that resolves the contradiction between area efficiency and transmission functionality.
Solution Approach 2:
The patent utilizes the two-dimensional plane more efficiently by allowing transmission lines to traverse across the entire available area rather than being constrained to direct paths. The meandering design spreads the transmission path across multiple regions of the substrate, effectively using spatial distribution in both x and y dimensions to minimize the bounding box area while maintaining the required electrical length and signal integrity.
2Ease of manufacture
If larger area is allocated for transmission lines, then signal transmission performance is maintained, but manufacturing costs increase
Solution Approach 1:
By implementing meandering transmission lines with curved paths, the patent achieves the required signal transmission performance within a compact area. This reduces the amount of substrate material needed and decreases the overall component footprint, directly lowering manufacturing costs while maintaining electrical performance through the optimized curved geometry that controls impedance and signal integrity.
Solution Approach 2:
The patent optimizes various parameters of the meandering transmission lines including path length, curvature radius, line width, and spacing to achieve the desired characteristic impedance and signal transmission characteristics. By carefully adjusting these geometric parameters, the design maintains signal integrity while minimizing area, thereby reducing manufacturing costs without sacrificing performance.
3Adaptability or versatility
If compact design is implemented, then integration into integrated circuits becomes easier, but transmission line performance may be affected
Solution Approach 1:
The meandering transmission lines use carefully designed curved paths that maintain controlled impedance throughout the meander sections. The curvature radii are optimized to avoid excessive parasitic effects while achieving compactness. This allows the transmission lines to be integrated into IC layouts with standard fabrication processes while maintaining signal transmission reliability through proper electromagnetic field control along the curved paths.
Solution Approach 2:
The patent employs parameter optimization to balance compactness and performance. By adjusting the meander geometry parameters such as pitch, curvature radius, and line width, the design achieves the required electrical length and impedance matching in a compact footprint. These parameter adjustments ensure that signal transmission reliability is maintained despite the reduced size, enabling successful integration into ICs.
Data Source
AI summary
A passive component comprising a first port and a second port, wherein the first and second ports are provided on a first axis, a third port and a fourth port, wherein the third and fourth ports are provided on a second axis perpendicular to the first axis, and a transmission line arrangement comprising four transmission lines, wherein the first port and the second port are each coupled to both the third port and the fourth port by respective transmission lines of the transmission line arrangement, wherein each transmission line follows a meandering path and each transmission line has the same length, such that the transmission line arrangement is symmetrical about at least one axis of symmetry.