Embedded Resonator Plate for GHz Common-Mode Noise Suppression
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Solution Overview
Problem
Conventional devices for suppressing common-mode radiation in cable conductors are ineffective in the GHz frequency band and are bulky and expensive, failing to adequately address noise issues in high-speed digital circuits.
Innovation Solution
A device featuring embedded resonators, such as split-ring or spiral resonators, within a flexible or ferromagnetic plate that wraps around the cable conductor, allowing the magnetic field to resonate and generate diamagnetism to suppress common-mode radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ferrite bead is used to suppress common-mode noise, then common-mode noise in the frequency band of a few hundred MHz can be suppressed, but the device becomes of great thickness and is expensive, and is not applicable to the GHz frequency band
Solution Approach 1:
The patent changes the operating frequency parameter by designing resonators with specific dimensions and configurations that resonate at GHz frequencies rather than MHz frequencies. The resonator geometry (size, shape, spacing) is optimized to achieve resonance at the target frequency band, enabling effective common-mode noise suppression in the GHz range while maintaining a thin profile.
Solution Approach 2:
The patent divides the suppression function into multiple resonator elements arranged in arrays on the plate. These segmented resonators work collectively to provide broadband suppression across the GHz frequency range, replacing the single bulky ferrite bead with multiple smaller resonant elements that achieve the same or better performance with reduced thickness.
2Object-affected harmful factors
If a ferrite bead is used to suppress common-mode noise, then common-mode noise in the frequency band of a few hundred MHz can be suppressed, but the device becomes expensive
Solution Approach 1:
The patent changes the material and structural parameters to achieve GHz frequency suppression. By using planar resonator structures that can be manufactured using standard PCB or flexible circuit board techniques, the cost is reduced compared to traditional ferrite beads while achieving the desired suppression performance in the GHz band.
Solution Approach 2:
The patent replaces the three-dimensional ferrite bead mechanical structure with a two-dimensional planar resonator system. This substitution enables manufacturing using conventional circuit board fabrication processes, significantly reducing cost while maintaining or improving suppression effectiveness.
3Object-affected harmful factors
If conventional suppression devices are used, then they can suppress common-mode noise at lower frequencies, but they are not competent for the GHz frequency band
Solution Approach 1:
The patent uses multiple resonator elements with different geometries and configurations arranged in arrays, each resonating at different frequencies within the GHz band. This segmentation approach provides broadband suppression coverage across the entire GHz frequency range, making the device adaptable to various GHz applications.
Solution Approach 2:
The patent designs the resonator array and plate structure to provide universal suppression capability across the GHz frequency band. The same device structure can suppress common-mode noise at different GHz frequencies by adjusting the resonator parameters, making it versatile for various high-speed digital circuit applications operating at different GHz frequencies.
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
Effectively reduces common-mode radiation and noise in the GHz frequency band, as demonstrated by reduced common-mode current and far-field radiation power, with adjustable parameters for tailored suppression.
Implementation Method 1
the magnetic field and the at least one resonator resonate together to generate a strong diamagnetism and thereby to suppress the common-mode radiation
Implementation Method 2
the magnetic field and the at least one resonator resonate together
Data Source
AI summary
The present invention provides a device for suppressing common-mode radiation comprising: at least one resonator embedded into a plate, wherein the at least one resonator defines a plane having a normal direction parallel and perpendicular, respectively, to a longitudinal direction and a thickness direction of the plate. The embedment of the resonator into the plate enables a magnetic field, which is generated by a cable conductor when the device for suppressing common-mode radiation wraps the cable conductor therein, to perpendicularly pass through the plane so that the magnetic field and the resonator resonate together to generate a strong diamagnetism and thereby to suppress the common-mode radiation.