Multilayer Transmission Line Slit Geometry for Signal Leakage Control
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Solution Overview
Problem
Existing technologies for reducing high-frequency signal leakage in multilayer dielectric boards are insufficient, particularly when the electric field waves of the signals oscillate at angles relative to the electric field direction, leading to increased phase deviation and leakage.
Innovation Solution
A transmission line assembly with band-like slits concavely curved toward the interlayer line, forming an open stub configuration that reduces leakage by reflecting echo signals and maintaining consistent distance from the interlayer line, eliminating the need for a choke structure and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional waveguide structures are used in multilayer dielectric boards, then high-frequency signals can be transmitted, but signal leakage increases when electric field waves oscillate at angles relative to the electric field direction
Solution Approach 1:
The patent applies curvature by forming the edge of each slit with a concave curve facing the interlayer line, rather than using straight edges. This curved geometry creates a more effective reflection pattern for echo signals, reducing signal leakage across various propagation directions including angled oscillations relative to the electric field direction
2Object-generated harmful factors
If choke structures are used to reduce signal leakage, then leakage reduction is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the choke structure from the design, achieving signal leakage reduction through a simpler configuration. By removing the complex choke structure and replacing it with concavely curved slits in ground patterns, the invention maintains leakage reduction effectiveness while significantly simplifying the overall device structure
Solution Approach 2:
Instead of adding complex choke structures to prevent leakage, the patent inverts the approach by using simple concave curves in the ground pattern slits that naturally reflect echo signals. This inverted design philosophy achieves the same leakage reduction goal through a more elegant and simpler means
3Object-generated harmful factors
If choke structures with precise slit positioning are used, then signal leakage is reduced, but manufacturing precision requirements and difficulty increase
Solution Approach 1:
The patent changes the geometric parameter of the slits from straight edges to concave curves, which fundamentally alters how the slits interact with electromagnetic waves. This parameter change makes the system less sensitive to precise positioning requirements, as the curved geometry provides more robust leakage reduction across varying positions and angles
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 effectively reduces high-frequency signal leakage across various propagation directions, improving transmission loss curves and maintaining low transmission loss levels, while simplifying the manufacturing process by eliminating the need for via holes and precise slit positioning.
Implementation Method 1
reduces leakage by reflecting echo signals
Data Source
AI summary
A transmission line assembly is configured such that (i) a first target inner layer is one of second to (N−1)-th pattern layers selected therefrom, and (ii) a second target inner layer is another one of the second to (N−1)-th pattern layers selected therefrom; the second to (N−1)-th pattern layers except for the first and second target inner layers are referred to as inner layers. The transmission line assembly includes band-like first and second slits formed through the ground pattern of a corresponding one of the first and second target inner layers to expose a part of one of dielectric layers; the one of the dielectric layers is adjacent to the corresponding one of the first and second target inner layers. Each of the first and second slits has an edge facing the interlayer line, and the edge of each of the first and second slits is concavely curved toward the interlayer line.