Frequency Selective Surface Resonator Design for Adjustable Bandwidth
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Solution Overview
Problem
Designing frequency selective surfaces is challenging due to the complexity of obtaining desired frequency characteristics, making it a costly and labor-intensive process.
Innovation Solution
A frequency selective surface with resonators formed by conductive patterns arranged on a dielectric substrate, featuring a conductor wire part and longitudinal pattern forming a cross, where both ends are extended orthogonally, and an electrode plate part is shaped to oppose another resonator's tip with a notched central portion, allowing for adjustable operating frequency and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional frequency selective surfaces with various resonance structures are used to achieve desired frequency characteristics, then the frequency selectivity is improved, but the design complexity and cost increase significantly
Solution Approach 1:
The resonator is segmented into distinct functional parts: a cross-shaped conductor wire part and an electrode plate part with notched portions. This segmentation allows independent optimization of each part's contribution to the overall frequency characteristics, simplifying the design process while maintaining precise frequency selectivity.
Solution Approach 2:
The electrode plate part features localized notched portions at specific positions, creating areas with different electrical properties. These local variations in structure allow precise control over the resonance characteristics without requiring complex overall design, thereby achieving desired frequency characteristics with simpler design procedures.
2Reliability
If multiple structural parameters are adjusted to optimize frequency characteristics, then the performance is improved, but the design process becomes more labor-intensive and time-consuming
Solution Approach 1:
The invention provides a systematic approach to parameter optimization by defining specific geometric parameters (cross wire dimensions, electrode plate dimensions, notched portion positions and sizes) that directly control the resonance frequency and bandwidth. This structured parameter framework enables efficient optimization with reduced design iterations, saving time while achieving reliable frequency characteristics.
3Ease of manufacture
If the resonator structure is simplified for easier manufacturing, then the ease of manufacture is improved, but the ability to control bandwidth and operating frequency is reduced
Solution Approach 1:
The resonator design incorporates adjustable geometric parameters that allow the operating frequency and bandwidth to be tuned by simply changing dimensional values during the manufacturing process. The notched portions in the electrode plate can be varied in position, size, and shape to dynamically adjust the electrical characteristics, maintaining frequency control capability while using a relatively simple manufacturing process.
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
Enables easy adjustment of operating frequency and bandwidth, simplifying the design process and improving the frequency selective surface's performance by controlling resonance frequencies and bandwidths.
Implementation Method 1
Frequency selective surfaces impart frequency dependency to transmission characteristics/reflection characteristics of incident electromagnetic waves by periodically arranging resonators (unit cells) formed by conductor patterns of which dimensions are approximately equal to or smaller than a wavelength
Data Source
AI summary
To provide a frequency selective surface of which an operating frequency and a bandwidth thereof can be readily adjusted. A frequency selective surface structured such that resonators kxy formed by conductive patterns with a same shape are periodically arranged on a dielectric substrate, wherein the resonator kxy includes: a conductor wire part with a lateral pattern 10 and a longitudinal pattern 20 which form a cross above a dielectric substrate 101; and an electrode plate part created by extending, in directions in which the lateral pattern and the longitudinal pattern are orthogonal to each other, respective both end parts of the lateral pattern and the longitudinal pattern having been extended by a prescribed length, the electrode plate part being shaped such that a tip portion thereof opposes a tip portion extended from another direction at an interval above a diagonal line, and the electrode plate part is shaped such that a central portion opposing an electrode plate part of another adjacent resonator is notched in a width of the lateral pattern, the electrode plate part being joined with the electrode plate part of the other adjacent resonator by being extended from a center of the notched portion in a width that is narrower than the width of the lateral pattern 10 and in a length that is shorter than the prescribed length, and the interval of the tip portion is wider than an interval with the electrode plate part of the other adjacent resonator.