3D Superconducting Filter With Movable Film Tuning
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Solution Overview
Problem
Conventional high-frequency bandpass filters face challenges in simultaneously achieving high electrical power tolerance, compact size, and variable center frequency, particularly in superconducting filters used in radio base stations, where existing tunable filters often experience degradation in Q characteristics and struggle to handle power higher than a few tens of watts.
Innovation Solution
A three-dimensional filter design featuring a pair of superconductor films opposed to each other, with a movable superconductor film and a dielectric resonator between them, coupled with a conductor case and waveguides, allowing for adjustable frequency characteristics and improved power tolerance through the use of a dielectric block and a piezoelectric actuator for precise control of the superconductor film position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a planar-circuit structure with superconductor film is used, then frequency selectivity is improved, but power tolerance deteriorates
Solution Approach 1:
The invention transitions from a two-dimensional planar-circuit structure to a three-dimensional structure by stacking multiple dielectric layers with superconductor films formed on their surfaces. This vertical stacking arrangement distributes current paths across multiple layers, reducing current density concentration and improving power tolerance while maintaining frequency selectivity through precise control of inter-layer spacing and coupling.
2Reliability
If the superconductor film pattern is formed in a patch shape, then power concentration is reduced, but device complexity increases
Solution Approach 1:
The invention divides the superconductor film into multiple discrete patterns across different dielectric layers, with each layer containing segmented resonator structures. This segmentation distributes current density across multiple separated regions, reducing power concentration and improving power characteristics while the modular layered structure keeps fabrication manageable.
3Reliability
If a three-dimensional structure with stacked dielectric layers is used, then power tolerance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention incorporates alignment marks and positioning structures during the fabrication process to pre-establish precise spatial relationships between superconductor films on different dielectric layers. By preparing alignment features beforehand, the required manufacturing precision is achieved through guided registration rather than relying solely on high-precision deposition processes.
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 design achieves a high unloaded Q factor and tunable frequency characteristics, enabling efficient high-frequency signal transmission with improved power tolerance and compactness, suitable for high-power applications in radio communication systems.
Implementation Method 1
a piezoelectric actuator for precise control of the superconductor film position
Implementation Method 2
a pair of superconductor films opposed to each other, with a movable superconductor film and a dielectric resonator between them
Data Source
AI summary
A three-dimensional filter includes a pair of superconductor films opposed to each other, and a three-dimensional resonator made of dielectric and situated between the superconductor films, wherein one of the superconductor films is movable relative to the three-dimensional resonator.