Electromagnetic Screen With Capacitor Lattices For Compact Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electromagnetic shielding screens are ineffective at smaller sizes compared to the wavelength, as they allow electromagnetic waves to bypass the shielding due to their cross-sectional dimensions, leading to reduced radiation suppression and complex designs with non-uniform impedance.
Innovation Solution
A device with a flat metallic reflector and two capacitor-type parallel lattices, where at least one lattice is electrically connected to the edge of the reflector, forming an artificial magnetic conductor (AMC) with a high and homogeneous surface impedance, creating a deep electromagnetic shadow even at smaller sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional metallic or radio-absorbing screens are reduced in cross-sectional size, then the screen becomes smaller and more compact, but the shielding effectiveness deteriorates because electromagnetic waves can easily flow around the screen
Solution Approach 1:
The patent changes the electromagnetic parameters of the screen surface by using high-impedance surfaces and metamaterials with specific permittivity and permeability values. This creates a resonance effect that generates a magnetic wall, fundamentally altering how the screen interacts with electromagnetic waves and enabling effective shielding at reduced sizes
Solution Approach 2:
The patent employs composite structures combining metallic lattices, dielectric materials, and metamaterials with specific electromagnetic properties. These composite materials create artificial magnetic conductors that produce strong magnetic fields to block electromagnetic radiation, achieving superior shielding performance in a compact form factor
2Volume of moving object
If the cross-sectional size of the screen is made small, then the device becomes more compact, but the impedance uniformity across the screen surface deteriorates
Solution Approach 1:
The patent carefully controls and adjusts the electromagnetic parameters (permittivity, permeability, impedance) of the metamaterials and structural dimensions to achieve impedance matching across the entire screen surface. This parameter optimization ensures uniform impedance distribution even in compact screens, preventing edge effects and maintaining consistent shielding performance
Solution Approach 2:
The patent implements local variations in the lattice structure and material properties across different regions of the screen to compensate for edge effects and maintain uniform impedance. By adjusting local structural parameters, the patent achieves homogeneous impedance distribution across the entire screen surface despite the reduced overall size
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 achieves significant electromagnetic radiation shielding, with a resonant frequency and Q-factor that determine the shielding effectiveness, demonstrating over 15 dB reduction in radiation, even when the screen's cross-sectional sizes are smaller than the wavelength, and maintains uniform impedance across the surface.
Implementation Method 1
The resonance of system is the resonance of a large number of the connected elementary resonators. Each elementary resonator is formed by capacity between two elements of the mobile and motionless lattices and also inductance of the circuit including a site of a metal substrate
Implementation Method 2
Each elementary resonator is formed by capacity between two elements of the mobile and motionless lattices and also inductance of the circuit including a site of a metal substrate and 2 next conductors connecting elements of the motionless lattice with a metal substrate
Implementation Method 3
at falling an electromagnetic wave on this surface the tangential magnetic field has a node instead of an antinode, as on a surface of an electric conductor. In particular, it is shown that behind such surfaces, even with a limited cross-section size, the area of a deep electromagnetic shadow is formed
Data Source
AI summary
The device according to an exemplary embodiment of the present invention relates to an area of wireless communication and can be used for shielding from electromagnetic radiation. The electromagnetic screen with the big surface impedance contains a flat metal reflector substrate and two lattices of capacitor type that are shifted from each other on a share of the period in parallel and located above the reflector substrate. At least one of lateral edges of the lattices has an electric connection with an edge of the reflector substrate.