EBG Structure Impedance Optimization for Broadband Noise Blocking
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Solution Overview
Problem
Conventional EBG structures in multi-layer circuit boards often fail to effectively block noise across a broad frequency range, particularly below 1 GHz, leading to voltage variations and abnormal operations in electronic devices.
Innovation Solution
The method involves enhancing EBG structures by measuring and optimizing the input impedance of EBG units, determining suitable capacitance and resistance values, and coupling electronic elements in parallel to create a broadband bandgap that covers frequencies from nearly DC to 7 GHz, thereby reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EBG structures are used in multi-layer circuit boards, then noise blocking is provided at certain frequencies, but noise below 1 GHz cannot be effectively blocked and voltage variations occur
Solution Approach 1:
The patent changes the electrical parameters of the EBG structure by introducing electronic elements (capacitors and resistors) to modify the impedance characteristics. By adjusting capacitance values (e.g., 0.1pF to 10pF) and resistance values (e.g., 1Ω to 100Ω), the bandgap frequency range is extended to cover low frequencies below 1 GHz while maintaining high-frequency noise blocking capability
Solution Approach 2:
The patent creates a composite electromagnetic structure by combining the conventional EBG unit structure with electronic elements (capacitors and resistors). This composite configuration forms an equivalent circuit that integrates the geometric inductance of the EBG pattern with the electrical components, achieving broadband noise blocking from DC to high frequencies
2Reliability
If EBG structures are designed to block broad frequency range, then noise blocking improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by placing electronic elements (capacitors and resistors) only at specific positions within the EBG unit structure, such as at the feed points or at strategic locations along the pattern. This localized addition modifies the impedance characteristics without requiring complex changes to the entire EBG structure, maintaining manufacturing simplicity while achieving broadband performance
Solution Approach 2:
The patent segments the EBG structure into modular units, each containing the patterned geometry and associated electronic elements. These modular EBG units can be independently designed, analyzed, and manufactured, then replicated and arranged across the circuit board to form a comprehensive noise blocking system, reducing overall device complexity
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 approach effectively blocks noise across a wide frequency band, ensuring better power supply integrity and reducing the likelihood of system failures by minimizing parallel resonance and maintaining low insertion losses.
Implementation Method 1
an electromagnetic bandgap (EBG) structure may be applied to resolve the aforementioned problems, in which a gandgap is designed to block the noises
Implementation Method 2
a maximum input impedance of the EBG unit under a predetermined frequency band is measured, in which a frequency corresponding to the maximum input impedance is a resonance frequency
Data Source
AI summary
A method for improving EBG (electromagnetic bandgap) structures is provided. First, a multi-layer board having at least one EBG unit is provided. Then, a maximum input impedance of the EBG unit under a predetermined frequency band is measured, in which a frequency corresponding to the maximum input impedance is a resonance frequency, and a capacitance is determined based on the resonance frequency. Besides, a minimum input impedance of the EBG unit is measured, and a logarithmic value corresponding to the maximum input impedance and a logarithmic value corresponding to the minimum input impedance are obtained so as to determine a resistance. Finally, an electronic device having the capacitance and the resistance is coupled to the EBG unit in parallel.