Frequency Selective Surface Resonator Layout for Sharper Attenuation
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Solution Overview
Problem
Conventional frequency selective surfaces face limitations in achieving desired frequency characteristics due to constraints on resonator size and fabrication accuracy, resulting in poor sharpness of frequency selection and limited applicability.
Innovation Solution
A frequency selective surface is designed with resonators having identical shapes periodically arrayed on a dielectric substrate, featuring an equivalent circuit with two or more LC serial resonance circuits connected in parallel, which increases the steepness of the attenuation slope without reducing the line width or pattern interval of the conductive pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the line width of conductive pattern and pattern interval are decreased to increase inductance and capacitance, then the resonance frequency characteristics improve, but the fabrication accuracy constraint cannot be satisfied
Solution Approach 1:
The resonator is divided into multiple conductive patterns (first conductive pattern and second conductive pattern) that are spatially separated but electrically connected through capacitive coupling. This segmentation allows each pattern to maintain adequate line width and spacing for fabrication while collectively providing the required inductance and capacitance values for the resonance circuit.
Solution Approach 2:
The invention transitions from a single-planar conductive pattern to a multi-layer structure with conductive patterns on different surfaces of the dielectric substrate. This dimensional change enables independent optimization of each pattern's geometry for fabrication ease while achieving the desired electrical characteristics through inter-layer capacitive coupling.
2Speed
If the resonator size is decreased to meet wavelength constraint, then the frequency selective surface prevents unexpected resonance, but the inductance and capacitance magnitudes necessary for desired frequency characteristic cannot be ensured
Solution Approach 1:
Multiple conductive patterns are merged into a single resonator unit through capacitive coupling, where the first and second conductive patterns work together as one functional resonance element. This merging allows the resonator to achieve the required total inductance and capacitance values while maintaining a compact overall size that satisfies the wavelength constraint.
Solution Approach 2:
The resonator is constructed as a composite structure combining multiple conductive patterns with different geometries and orientations on a dielectric substrate. This composite configuration enables the system to achieve the desired equivalent inductance and capacitance values through the combined electromagnetic effects of all components while maintaining a size appropriate for the operating wavelength.
3Measurement precision
If the gradient of attenuation slope is increased by decreasing capacitance and increasing inductance, then the sharpness of frequency selection improves, but the line width and pattern interval must be decreased which conflicts with fabrication constraints
Solution Approach 1:
Different regions of the resonator are assigned different geometric characteristics to optimize local electromagnetic properties. The first conductive pattern may have dimensions optimized for inductance while the second pattern is optimized for capacitance, with their relative positioning and coupling distance tuned to achieve the desired attenuation slope gradient without requiring uniformly small line widths or pattern intervals throughout the entire structure.
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 configuration provides a frequency selective surface with a steep attenuation slope characteristic, enhancing the sharpness of frequency selection without compromising the line width or pattern interval, thus improving the applicability of the surface.
Implementation Method 1
The operation principle thereof can be explained based on a resonance phenomenon of an equivalent circuit expressed with inductance and capacitance included in each resonator
Implementation Method 2
an equivalent circuit in which two or more LC serial resonance circuits are connected in parallel with each other
Implementation Method 3
an equivalent circuit in which two or more LC serial resonance circuits are connected in parallel with each other
Data Source
AI summary
A frequency selective surface having a steep attenuation slope (high sharpness) characteristic is provided without decreasing the line width of a conductive pattern nor the pattern interval thereof. In a frequency selective surface having a structure in which resonators k1xy having identical shapes are periodically arrayed on a dielectric substrate 101, each resonator k1xy includes a cross-shaped conductive pattern formed on the dielectric substrate 101 and a lateral pattern 10 and a longitudinal pattern 20 forming a cross are shaped such that each pattern is extended by a predetermined length in respective directions, each pattern extended by the predetermined length is further extended in both directions orthogonal to each other on the dielectric substrate 101, and leading end parts of the respective further extensions face each other at a predetermined interval d.