Transmission Line Bypassing Interlayer Conductors

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Solution Overview

Problem

Existing transmission lines with stripline structures face challenges in minimizing unwanted coupling between signal lines while maintaining desired characteristic impedance, often requiring increased width and complexity in the multilayer insulating body due to the arrangement of interlayer connecting conductors.

Innovation Solution

The transmission line design incorporates a multilayer insulating body with a conductor pattern featuring multiple ground conductor patterns and signal conductor patterns, where the signal conductors have bypassing pattern portions that avoid interlayer connecting conductors, reducing unwanted coupling and maintaining a smaller size by stabilizing the potential of ground conductors and distributing interlayer connecting conductors to minimize capacitance and maintain symmetry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If interlayer connecting conductors are arranged between adjacent signal lines to suppress unwanted coupling, then coupling suppression is improved, but the width of the multilayer insulating body is increased

Engineering Contradiction:

Improveunwanted coupling between signal linesVSAvoidwidth of multilayer insulating body

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The patent moves the interlayer connecting conductors from a lateral arrangement (between signal lines in the width direction) to a vertical arrangement (between insulator layers in the thickness direction). This dimensional change allows the connecting conductors to be positioned at the corners of the insulating body, suppressing unwanted coupling without increasing the width of the multilayer insulating body.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent divides the interlayer connecting conductors into multiple segments positioned at different corners of the multilayer insulating body. This segmentation allows the connecting conductors to be distributed throughout the structure, effectively suppressing unwanted coupling between signal lines while maintaining a compact width.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If the pitch of interlayer connecting conductors is set to a small value to reduce unwanted coupling, then coupling suppression is improved, but the capacitance between signal line and interlayer connecting conductor is increased

Engineering Contradiction:

Improveunwanted coupling between signal linesVSAvoidcapacitance between signal line and interlayer connecting conductor

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The patent extracts the interlayer connecting conductors from their traditional position adjacent to signal lines and relocates them to the corners of the multilayer insulating body. This extraction removes the harmful capacitive coupling between signal lines and interlayer connecting conductors while maintaining the shielding function against unwanted coupling.

Inventive Principle:

Principle #2Taking out (Extraction)

3Area of stationary object

If the width of the multilayer insulating body is reduced to minimize size, then device size is reduced, but the capacitance between signal line and interlayer connecting conductor is increased

Engineering Contradiction:

Improvewidth of multilayer insulating bodyVSAvoidcapacitance between signal line and interlayer connecting conductor

Core Design Contradiction:

Area of stationary objectVSQuantity of substance

Solution Approach 1:

By relocating interlayer connecting conductors to the corners of the insulating body and arranging them in the thickness direction rather than the width direction, the patent enables reduced width of the multilayer insulating body without increasing capacitance between signal lines and interlayer connecting conductors.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design effectively reduces unwanted coupling and cross-talk between signal lines, allows for a smaller transmission line width, and stabilizes the potential of ground conductors, ensuring a consistent characteristic impedance and reducing the thickness of the multilayer insulating body.

Implementation Method 1

an interlayer connecting conductor that establishes interlayer connection between the first ground conductor pattern and the second ground conductor pattern

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Implementation Method 2

the first signal conductor pattern includes a first bypassing pattern portion that bypasses the first interlayer connecting conductor

Methodology Applied

Scientific EffectElectromagnetic Field Coupling: Electromagnetic Induction

Data Source

PatentUS11581622B2Transmission line and electronic device

Publication Date: 2023.02.14 MURATA MFG CO LTD

AI summary

In a transmission line, a first ground conductor pattern and a second ground conductor pattern are connected through a first interlayer connecting conductor, and the first ground conductor pattern and a third ground conductor pattern are connected through a second interlayer connecting conductor. A first signal conductor pattern includes a first bypassing pattern portion that bypasses the first interlayer connecting conductor, and a second signal conductor pattern includes a second bypassing pattern portion that bypasses the second interlayer connecting conductor. Bypassing directions of the first bypassing pattern portion and the second bypassing pattern portion are opposite to each other.