Polygonal Band-Stop Filter Structure for Compact Frequency Tuning
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Solution Overview
Problem
Conventional frequency selective surfaces (FSS) struggle to effectively control electromagnetic waves in complex radio environments due to fixed resonator sizes, limited frequency tunability, and space constraints, leading to inefficiencies in managing radiation noise and security threats from mobile communication devices.
Innovation Solution
The electromagnetic field band-stop filter employs a design with polygonal unit structures featuring conductor parts with bent portions and sub-resonators, allowing for increased inductance and capacitance, enabling flexible frequency characteristics and miniaturization, while maintaining desired reflection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional FSS with fixed resonator structures is used, then the resonator size is determined by wavelength requirements, but the device occupies large area and cannot be miniaturized
Solution Approach 1:
The patent introduces variable capacitor elements that can dynamically adjust capacitance values, allowing the resonant frequency to be tuned without changing the physical size of the resonator structure. This enables the filter to maintain effective frequency control while occupying minimal space, resolving the contradiction between miniaturization and frequency control effectiveness
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) of the resonator components to achieve frequency tuning instead of changing physical dimensions. By varying capacitance parameters while keeping the resonator structure compact, the filter achieves both miniaturization and maintained frequency control effectiveness
2Adaptability or versatility
If conventional FSS with fixed resonator structures is used, then the structure is simple, but the frequency characteristics cannot be tuned flexibly
Solution Approach 1:
The patent employs dynamically adjustable capacitor elements that can change capacitance values electronically, providing flexible frequency tuning capability. The underlying resonator structure remains relatively simple, but the dynamic parameter adjustment enables adaptability across different frequency bands without significantly increasing structural complexity
Solution Approach 2:
The patent designs a universal resonator structure that can operate across multiple frequency bands by adjusting capacitor values rather than requiring different structures for each frequency. This multi-functional approach enables frequency tunability while maintaining a consistent, manageable structural design
3Reliability
If conventional FSS is used in limited spaces, then the reflection properties may not be sufficient, but increasing the filter size is not feasible
Solution Approach 1:
The patent optimizes electrical parameters including capacitance values and inductance ratios to enhance reflection performance within a compact footprint. By carefully tuning these parameters, the filter achieves sufficient reflection properties without requiring large physical dimensions, resolving the contradiction between reflection performance and area constraints
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 design achieves efficient frequency control and miniaturization, allowing for effective band-stop filtering in limited spaces, reducing radiation noise and enhancing security by tuning resonance frequencies without the need for extensive redesign.
Implementation Method 1
a design with polygonal unit structures featuring conductor parts with bent portions and sub-resonators, allowing for increased inductance and capacitance
Implementation Method 2
a design with polygonal unit structures featuring conductor parts with bent portions and sub-resonators, allowing for increased inductance and capacitance
Implementation Method 3
enabling flexible frequency characteristics and miniaturization, while maintaining desired reflection properties
Implementation Method 4
an electromagnetic field band-stop filter that reflects electromagnetic waves of a specific frequency
Implementation Method 5
a conductor part of the FSS has a resonance structure
Data Source
AI summary
An electromagnetic field band-stop filter includes a plurality of unit structures that have reflection characteristics on an electromagnetic wave of a predetermined frequency. Each of the plurality of unit structures includes: a plurality of electrode parts each of which is disposed along a side of a polygon in a non-contact manner with another electrode part; and a plurality of conductor parts which are provided for the plurality of electrode parts on a one-to-one basis and each of which has at least one bent portion between one end and other end, the one ends of the plurality of conductor parts being connected to the electrode parts on a one-to-one basis and the other ends of the plurality of conductor parts being connected at one point on an inner side of the electrode parts in the individual unit structure. The plurality of unit structures are regularly and two-dimensionally disposed by disposing electrode parts of the plurality of unit structures to be adjacent to each other with a spacing that reflects the predetermined frequency.