Superconducting Radiofrequency Power Limiter with Reversible Phase Transition
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Solution Overview
Problem
Existing radiofrequency power limiters, such as those using PIN diodes and coplanar waveguides, suffer from high insertion losses, limited bandwidth, and irreversible operation, making them unsuitable for applications requiring analysis of signals with a large dynamic range over a wide spectral band.
Innovation Solution
A radiofrequency power limiter device utilizing a line with a second geometry and made of a second superconducting material, featuring a normal phase and a superconducting phase with a transition temperature difference, allowing for adjustable power limiting and reversible operation by modifying the geometry or operating temperature, and comprising zones of different superconducting materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PIN diodes are used as power limiters, then protection from high power signals is achieved, but insertion losses become high and bandwidth is limited
Solution Approach 1:
The patent changes the material parameter from conventional semiconductor (PIN diode) to superconducting material, which fundamentally alters the electrical properties. The superconducting material exhibits zero resistance below its critical temperature, enabling power limiting functionality with minimal insertion losses while maintaining broad bandwidth operation.
Solution Approach 2:
The patent employs composite superconducting structures combining different superconducting materials with distinct critical temperatures. This composite approach allows optimization of both protection capability and insertion loss characteristics by leveraging the complementary properties of different superconducting materials in a unified device architecture.
2Reliability
If conventional power limiters are used, then protection is provided, but bandwidth is limited and operation becomes irreversible
Solution Approach 1:
The patent utilizes the temperature-dependent superconducting transition as a controllable parameter. By operating below the critical temperature, the device achieves both broad bandwidth and reversible operation. The superconducting state allows unrestricted frequency operation while the reversible transition enables dynamic control without permanent damage.
Solution Approach 2:
The patent implements dynamic, reversible power limiting through the controllable superconducting transition. The limiter can switch between superconducting and normal states reversibly based on power level, enabling adaptive protection that responds dynamically to incoming signals without irreversible degradation, unlike conventional limiters.
3Loss of energy
If superconducting materials are used, then insertion losses are reduced and bandwidth is widened, but device complexity increases
Solution Approach 1:
The patent divides the superconducting limiter into multiple segments or zones with different geometric characteristics or material compositions. This segmentation allows independent optimization of different functional regions while maintaining overall device simplicity. Each segment can be designed to handle specific aspects of the power limiting function, reducing the complexity of any single component.
Solution Approach 2:
The patent applies local quality variations within the superconducting structure, such as varying the thickness, width, or material composition in specific regions. This allows optimization of the superconducting properties locally to achieve desired performance characteristics while keeping the overall device design simple and manageable.
4Adaptability or versatility
If the transition temperature is lowered, then protection threshold is adjusted, but operating temperature requirements become more stringent
Solution Approach 1:
The patent uses composite superconducting materials or multi-layer structures with different critical temperatures. This allows the device to operate at a relatively higher temperature while still achieving the desired power limiting threshold through the lower-Tc component. The composite structure provides both the adjustable protection threshold and relaxed temperature requirements simultaneously.
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 device achieves low insertion losses, wide bandwidth, and reversible operation, effectively protecting electronic components from high electromagnetic fields while allowing for easy integration and adjustment of performance criteria.
Implementation Method 1
A radiofrequency power limiter device utilizing a line with a second geometry and made of a second superconducting material, featuring a normal phase and a superconducting phase with a transition temperature difference
Implementation Method 2
allowing for adjustable power limiting and reversible operation by modifying the geometry or operating temperature
Implementation Method 3
the first transition temperature is strictly lower than the second transition temperature
Data Source
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Figure 7~9
AI summary
An electronic device (10) for processing radio frequency waves (12) includes a line (22), having a second geometry (16, 20) and being made of a second superconducting material having a second transition temperature (T2), the line including a radio frequency power limiter (18) with two operating modes made in the form of a portion of the line, having a first geometry and being made of a first superconducting material having a superconducting phase, a normal phase and a first transition temperature (T1), the limiter being in one operating mode when the portion is superconducting and in a second operating mode when the portion is normal, the first geometry and the first superconducting material differing from the second geometry and the second superconducting material so that the first transition temperature is lower than the second transition temperature.