Loopback Switching Circuit With Grounded Line Sections for Wideband Isolation

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Solution Overview

Problem

Existing connecting devices face challenges in achieving wideband and high isolation characteristics when the loop back path is inactive, and low loss characteristics when it is active, due to the close proximity of elements which deteriorates isolation and increases signal loss.

Innovation Solution

The connecting device incorporates a first connecting unit with a pseudo-distributed constant line configuration, utilizing shunt-type switches to connect multiple sections of the transmission line to a reference potential, enhancing isolation and maintaining consistent impedance for reduced signal loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If elements are placed in close proximity to achieve high-density implementation, then device integration is improved, but isolation characteristics deteriorate and signal loss increases

Engineering Contradiction:

Improvedevice integration densityVSAvoidisolation characteristics

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The transmission line is divided into multiple sections with ground switching units inserted between them. This segmentation allows the transmission line to be divided into manageable segments that can be independently controlled, enabling high-density integration while maintaining isolation characteristics through selective grounding of each segment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Ground switching units are introduced as intermediary elements between transmission line sections. These switching units act as mediators that can connect or disconnect ground paths, providing isolation between closely-spaced elements when needed while allowing signal transmission when the isolation path is not required.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If ground switching units are added to improve isolation characteristics, then isolation performance is improved, but device complexity increases

Engineering Contradiction:

Improveisolation characteristicsVSAvoidnumber of switching components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The ground switching units serve multiple functions simultaneously: they provide isolation between transmission line sections, maintain characteristic impedance continuity, and enable high-density element placement. This multi-functionality reduces the need for additional dedicated isolation components, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The isolation function and impedance matching function are merged into a single ground switching unit structure. By combining these functions, the patent avoids adding separate isolation components that would further increase device complexity, achieving improved isolation without proportional increases in complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of energy

If transmission line sections are shortened to reduce signal loss, then signal loss is reduced, but isolation characteristics deteriorate due to closer element proximity

Engineering Contradiction:

Improvesignal lossVSAvoidisolation characteristics

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The ground switching units are made dynamically controllable, allowing the isolation paths to be activated or deactivated based on operational requirements. This dynamic control enables the system to achieve both short transmission line sections for low signal loss and adequate isolation when needed, resolving the contradiction between these two performance parameters.

Inventive Principle:

Principle #15Dynamics

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 configuration effectively improves isolation characteristics when the loop back path is inactive and reduces signal loss when active, enabling high-density implementation with wideband and low-loss performance.

Implementation Method 1

a first ground switching unit that connects two ends of the first transmission line as well as a contact point located on a line between the two ends of the first transmission line to a reference potential

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20250055169A1Connecting device, testing device, and communication device

Publication Date: 2025.02.13 ADVANTEST CORP

AI summary

A connecting device, including: a first connecting unit that switches a connection between a first terminal and a second terminal; and a second connecting unit that switches a connection between the first terminal or the second terminal and a third terminal, wherein the first connecting unit has: a first transmission line; a first connection switching unit that switches the connection between the first terminal and the second terminal via the first transmission line; and a first ground switching unit that switches a connection of each of three or more first connection points at different positions in the first transmission line to a reference potential.