Elliptical Ferrite Magnetic Core Shielding Filter
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Solution Overview
Problem
Current electromagnetic wave shielding filters, particularly low pass and band pass filters, are limited in effectively blocking all frequency bands while passing only desired signals, as they struggle to shield high-frequency signals and are prone to damage from external electromagnetic pulses, requiring frequent component replacement.
Innovation Solution
An electromagnetic wave shielding filter utilizing an elliptical magnetic core with high magnetic permeability, converting high-frequency signals to differential-mode signals, and using a high-conductivity material for shielding, which allows desired high-frequency signals to pass while blocking common-mode electromagnetic waves across the entire frequency band, eliminating the need for capacitive and inductive elements and reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a low pass filter is used to block high frequency bands for electromagnetic wave shielding, then shielding performance is improved, but desired high frequency signals cannot pass through
Solution Approach 1:
The filter is segmented into multiple resonant circuits, each tuned to specific frequency bands. This allows different frequency components to be handled separately - some blocked, others passed - resolving the contradiction between shielding and signal transmission.
Solution Approach 2:
Different portions of the filter have different characteristics - some sections are designed for shielding specific frequency bands while other sections allow desired signals to pass. This local differentiation enables simultaneous shielding and signal transmission.
2Object-affected harmful factors
If the shielding frequency is lowered to block lower frequency electromagnetic waves, then shielding effectiveness is improved, but power supply loss increases
Solution Approach 1:
The filter uses variable capacitors and adjustable resonant circuits that allow dynamic adjustment of the shielding frequency threshold. This enables optimization of the balance between shielding effectiveness and power loss based on actual operational requirements.
3Manufacturing precision
If traditional filter components are used to block interference frequencies, then frequency selectivity is improved, but the filter becomes vulnerable to external electromagnetic pulses
Solution Approach 1:
The filter employs composite structures combining multiple materials with different electromagnetic properties. This composite approach provides both frequency selectivity and enhanced resistance to external electromagnetic pulses, eliminating the vulnerability of traditional single-material filters.
4Manufacturing precision
If a band pass filter is used to pass only specific frequency bands, then frequency selectivity is improved, but blocking of other frequency bands becomes insufficient
Solution Approach 1:
The invention merges multiple filter functions into a single integrated structure that combines band-pass characteristics with additional shielding capabilities. This merged design achieves both precise frequency selection and comprehensive blocking of unwanted 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
The solution provides enhanced electromagnetic wave shielding with a high shielding effect of 100 dB or more across the entire frequency band, preventing signal loss and equipment damage, and allows continuous use without the need for component replacement.
Implementation Method 1
converting a high frequency electromagnetic wave signal to a differential-mode signal at a primary coil through a core shielding and penetration unit
Implementation Method 2
a structure filled with a high electrical-conductivity (low-resistance) material along the longitudinal direction at the center of the core
Implementation Method 3
transmitting the signal in the form of a differential-mode magnetic field from the outside of a shielding facility to the inside of the shielding facility by the elliptical magnetic core
Implementation Method 4
restoring the differential-mode high frequency signal at a secondary coil
Data Source
AI summary
An electromagnetic wave shielding filter is configured in a magnetic field transmission scheme, not in a low pass filter or band pass filter scheme, and thus allows a desired signal to pass, while maintaining unintended electromagnetic waves shielded.The present embodiment relates to an electromagnetic wave shielding filter for high-frequency communication, having a structure in which an elliptical ferrite magnetic core is formed inside the filter, a primary coil and a secondary coil are installed at both ends of the magnetic core, and then a shielding and penetration unit is formed of a shielding material on the elliptical magnetic field core, so that a signal from the primary coil is transmitted in the form of a magnetic field to the secondary coil, and the other unintended common-mode components are eliminated.