Resonant Cable Mantle for Broadband Shield Current Suppression
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Solution Overview
Problem
Existing methods for suppressing shield currents in shielded cables, such as LC-tank circuits and ferrite beads, are inadequate due to increased insertion losses, phase shifts, cumbersome manufacturing, and limited broadband and multi-frequency capabilities.
Innovation Solution
A cable mantle with a plurality of resonant elements forming an Electromagnetic Band Gap (EBG) structure, which includes inner and outer tube-shaped conductive structures, transversal conductive structures, and capacitors to create a parallel resonant circuit, providing high impedance and suppressing coupled shield currents without electrical attachment to the cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LC-tank circuits are used to reduce shield current, then shield current suppression is improved, but insertion losses increase due to extra cable length required for inductor turns
Solution Approach 1:
The invention transitions from a one-dimensional solution (winding cable in helix) to a three-dimensional structure (cable mantle with resonant elements surrounding the cable). The resonant elements are arranged circumferentially around the cable in a multi-dimensional configuration, creating electromagnetic band gap effects that suppress shield currents without requiring additional cable length, thereby avoiding increased insertion losses.
2Object-affected harmful factors
If LC-tank circuits are used to reduce shield current, then shield current suppression is improved, but manufacturing complexity increases due to cable modification requirements
Solution Approach 1:
The cable mantle is divided into multiple modular resonant elements that can be independently manufactured and then assembled around the cable. Each resonant element is a discrete component with standardized structure, allowing for simplified manufacturing processes and easy assembly without requiring complex cable modifications or removal of insulation layers.
Solution Approach 2:
The cable mantle acts as an intermediary structure that surrounds the existing shielded cable without requiring modification of the cable itself. The resonant elements are mounted on the outer surface of the cable's insulation layer, serving as a mediator that provides shield current suppression while leaving the original cable structure intact and unchanged.
3Object-affected harmful factors
If traditional cable-traps are used, then shield current suppression is improved, but adaptability decreases due to fixed narrowband operation
Solution Approach 1:
The cable mantle with resonant elements is designed to provide broadband shield current suppression across multiple frequency ranges. The resonant elements can be configured with different electrical lengths and capacitance values to target different frequency bands, making the structure universally applicable for suppressing shield currents in various electromagnetic environments without being limited to a single narrow frequency range.
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 shield currents across a wide range of frequencies, maintaining cable flexibility and compatibility with MRI devices, while being reusable and reconfigurable, with compact and multi-frequency capabilities.
Implementation Method 1
an electrical behavior of the inner tube-shaped conductive structure, the first longitudinal portion of the outer tube-shaped conductive structure, the second longitudinal portion of the outer tube-shaped conductive structure, the first transversal conductive structure, the second transversal conductive structure and the at least one capacitor is equivalent to a parallel resonant circuit defining a resonance frequency of the respective resonant element
Implementation Method 2
The resonant elements are configured to form an Electromagnetic Band Gap (EBG) structure, which provides a high impedance and thus suppresses coupled shield currents
Data Source
AI summary
A cable mantle for shield current suppression in a shielded cable includes a through hole for hosting the shielded cable; and a plurality of resonant elements; wherein each of the resonant elements includesan inner tube-shaped conductive structure; an outer tube-shaped conductive structure; a first transversal conductive structure; a second transversal conductive structure; andat least one capacitor bridging a gap between a first longitudinal portion of the outer tube-shaped conductive structure and a second longitudinal portion of the outer tube-shaped conductive structure, so that an electrical behavior of the inner tube-shaped conductive structure, the first longitudinal portion of the outer tube-shaped conductive structure, the second longitudinal portion of the outer tube-shaped conductive structure, the first transversal conductive structure, the second transversal conductive structure and the at least one capacitor is equivalent to a parallel resonant circuit defining a resonance frequency of the respective resonant element.