Compact Metamaterial Band Stop Filter for Waveguides
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Solution Overview
Problem
Current band pass and band stop filters used in phased array antennas require larger sizes due to the use of dielectric materials placed inline or in series within waveguides, which is not desirable for compact antenna designs.
Innovation Solution
A resonator system comprising a dielectric structure with conductive segments, such as split ring resonators, is placed within waveguides to reduce the passing of unwanted electromagnetic frequencies, acting as a compact band stop filter by blocking specific frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional band stop filters are placed within waveguides, then unwanted frequencies are reduced, but the size of the waveguide increases
Solution Approach 1:
The waveguide is divided into multiple sections with different dielectric materials arranged in parallel rather than in series. This segmentation allows each section to contribute differently to the filtering function while maintaining a more compact overall structure, resolving the contradiction between filtering effectiveness and waveguide size.
Solution Approach 2:
The patent transitions from a one-dimensional series arrangement of dielectric materials to a multi-dimensional parallel configuration. By arranging dielectric sections side-by-side along the waveguide cross-section rather than stacking them end-to-end, the filter achieves the same frequency rejection functionality with reduced longitudinal extent, thus compacting the waveguide size.
2Manufacturing precision
If dielectric materials are placed inline in waveguides to filter frequencies, then frequency selectivity is improved, but the length of the waveguide increases
Solution Approach 1:
The waveguide is divided into multiple sections with different dielectric materials arranged in parallel rather than in series. This segmentation allows each section to contribute differently to the filtering function while maintaining a more compact overall structure, resolving the contradiction between filtering effectiveness and waveguide size.
Solution Approach 2:
The patent transitions from a one-dimensional series arrangement of dielectric materials to a multi-dimensional parallel configuration. By arranging dielectric sections side-by-side along the waveguide cross-section rather than stacking them end-to-end, the filter achieves the same frequency rejection functionality with reduced longitudinal extent, thus compacting the waveguide 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 resonator system effectively reduces the transmission of unwanted frequencies, providing a compact solution for filtering electromagnetic signals while maintaining the ability to steer beams in phased array antennas, thus enhancing the antenna's performance and size efficiency.
Implementation Method 1
A resonator system comprising a dielectric structure with conductive segments, such as split ring resonators, is placed within waveguides to reduce the passing of unwanted electromagnetic frequencies, acting as a compact band stop filter by blocking specific frequency ranges.
Data Source
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AI summary
A method and apparatus comprising a dielectric structure (304) and a plurality of conductive segments (306, 308). The dielectric structure is configured for placement in a waveguide (302). The plurality of conductive segments is located within the dielectric structure. Each of the plurality of conductive segments is configured to reduce a passing of a number of frequencies of electromagnetic signals traveling through the dielectric structure.