Flat Electromagnetic Band Gap Resonance Structure for Noise Suppression
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Solution Overview
Problem
The intrinsic electromagnetic resonance frequency between power and ground planes in electric circuits can amplify noise, leading to lower signal-to-noise ratios and impacting normal operation, which existing technologies have not effectively addressed.
Innovation Solution
A flat electromagnetic band gap resonance structure is introduced, comprising multiple flat units with conductive stands connecting them to the ground and power planes, allowing for the suppression of resonance frequencies by adjusting the stub length of each flat unit, effectively decoupling the power and ground planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power plane and ground plane are used to transmit supply power, then power delivery is achieved, but electromagnetic resonance frequency amplifies noise and reduces signal-to-noise ratio
Solution Approach 1:
A flat electromagnetic band gap (EBG) resonance structure is introduced as an intermediary element between the power plane and ground plane. This EBG structure acts as a mediator that selectively suppresses electromagnetic resonance at specific frequencies while allowing power transmission to continue, thereby reducing noise amplification without compromising power delivery capability
Solution Approach 2:
The patent modifies the electromagnetic characteristics of the power delivery system by changing the physical parameters of the EBG structure, including the stub length, unit cell dimensions, and material properties. By adjusting these parameters, the resonance suppression frequency can be tuned to match problematic noise frequencies, transforming the system's electromagnetic response to eliminate noise amplification
2Object-affected harmful factors
If conventional resonance suppression methods are used, then some noise suppression is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The EBG structure is divided into multiple identical or modular unit cells arranged in a periodic pattern. Each unit cell contains a simple flat resonant element with a stub configuration. This segmentation allows the complex resonance suppression function to be achieved through repetition of simple, standardized units, reducing overall design complexity and facilitating manufacturing
Solution Approach 2:
The patent employs identical copies of the flat EBG unit cell structure across the power plane. By copying a single optimized unit cell design multiple times in a periodic array, the complex resonance suppression functionality is achieved through replication rather than through a single complex structure, simplifying both design and manufacturing processes
3Object-affected harmful factors
If flat EBG resonance structure is introduced to suppress resonance frequency, then noise reduction is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent provides specific parameter ranges and design guidelines for the EBG structure dimensions, including stub length, unit cell size, and spacing. By establishing optimized parameter ranges during the design phase, the structure achieves effective noise reduction while accommodating normal manufacturing tolerances, reducing the stringency of precision requirements
Solution Approach 2:
The EBG structure achieves noise suppression through local resonant elements (the flat units with stubs) distributed across the power plane. Each local unit contributes to the overall suppression effect, and the periodic arrangement ensures that the collective behavior achieves the desired frequency selectivity without requiring extremely precise manufacturing of individual elements
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 solution effectively suppresses resonance frequencies, reducing noise interference and improving signal quality by precisely tuning the resonance frequency, potentially reducing the need for decoupling capacitors and simplifying circuit design.
Implementation Method 1
a structure formed by power plane and ground plane has intrinsic electromagnetic resonance frequency (or frequencies)
Implementation Method 2
Each conductive stand (e.g., V[nx,ny] in FIG. 4) may be associated with one of the predetermined quantity of flat units (e.g., U[nx,ny] in FIG. 4), for connecting the associated flat unit to the first conductor layer
Data Source
AI summary
Circuit with flat electromagnetic band gap resonance structure, includes a plurality of flat units formed at a conductor layer; each flat unit spirally revolves inward from a first end to an internal point following a rotation direction, and spirally revolves outward from the internal point to a second end following an opposite rotation direction. Each flat unit is connected to a ground plane by a conductive stand (e.g., a via) at a connection point, for suppressing noise resonances at certain frequencies, and the frequencies are related to a stub length of each flat unit, and the stub length is related to a route length from the connection point to an end.