TaN Superconducting MMIC Passive Layers for Dual-Temperature Operation
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Solution Overview
Problem
Current monolithic microwave integrated circuits (MMICs) face challenges in achieving superconducting performance at low temperatures while maintaining functionality at room temperature, due to limitations in conductor loss and material properties of thin films used in transmission lines and inductors.
Innovation Solution
Incorporating Tantalum Nitride (TaN) as a superconducting material for passive elements in MMICs, which superconducts at low temperatures, and using a metal contact layer to enable operation at both low and room temperatures, allowing for the creation of superconducting monolithic microwave integrated circuits without additional cryogenic hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional conductor materials are used in MMIC transmission lines and inductors, then the circuit can operate at room temperature, but conductor loss increases at low temperatures preventing superconducting performance
Solution Approach 1:
The patent changes the material parameter of the conductor from conventional materials (copper, aluminum) to Tantalum Nitride, which has fundamentally different electrical properties at low temperatures. This material substitution enables the transition from resistive conduction to superconducting state, achieving zero conductor loss at cryogenic temperatures while maintaining structural compatibility with existing MMIC fabrication processes
Solution Approach 2:
The patent employs a composite structure where Tantalum Nitride superconducting material is integrated with conventional MMIC circuit elements. The Tantalum Nitride layer is deposited as a thin film (e.g., 5-50 nm) on the substrate and patterned to form transmission lines and inductors, creating a composite system that combines superconducting properties with standard MMIC architecture, enabling both low-temperature superconducting operation and compatibility with room-temperature fabrication
2Reliability
If Tantalum Nitride is used as the superconducting material, then superconducting performance is achieved at low temperatures, but additional cryogenic hardware is required
Solution Approach 1:
The patent designs the MMIC to serve multiple temperature regimes: the Tantalum Nitride-based passive elements (transmission lines, inductors) provide superconducting performance at low temperatures for high-sensitivity applications, while the active circuit elements (transistors, amplifiers) can operate at elevated temperatures. This multi-functional design allows a single device to leverage both superconducting advantages and conventional electronics, reducing the need for entirely separate cryogenic systems
3Ease of manufacture
If thin film materials are used for transmission lines and inductors, then integration is improved, but conductor loss increases due to material properties
Solution Approach 1:
The patent fundamentally changes the electrical parameter of the thin film conductor by using Tantalum Nitride, which exhibits superconductivity at low temperatures. This transforms the thin film from a high-loss resistive conductor into a zero-loss superconducting pathway, maintaining the integration advantages of thin film technology while eliminating the conductor loss problem that plagues conventional thin film MMICs at cryogenic temperatures
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 approach enhances the performance of MMICs by improving transmission line and inductor performance, enabling superconducting operations at low temperatures while maintaining functionality at room temperature, thus reducing manufacturing costs and increasing scalability.
Implementation Method 1
Tantalum Nitride superconducts at low temperatures (e.g., approximately temperatures below 4 Kelvin (K)), enabling a superconducting monolithic microwave integrated circuit
Implementation Method 2
a cryogenic refrigerator and a monolithic microwave integrated circuit comprising a superconducting layer coupled to a first circuit element and to a second circuit element, wherein a material of the superconducting layer comprises Tantalum Nitride, and wherein the monolithic microwave integrated circuit is located within the cryogenic refrigerator
Data Source
AI summary
One or more systems, devices, methods of use and/or methods of fabrication herein relate to superconducting monolithic microwave integrated circuits. According to an embodiment, a device comprises a monolithic microwave integrated circuit comprising a superconducting layer coupled to a first circuit element and to a second circuit element, wherein a material of the superconducting layer comprises Tantalum Nitride.