Silane Ink RFID Tags Reducing Parasitic Capacitance
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Solution Overview
Problem
Current RFID tag manufacturing processes are costly and inefficient, particularly in integrating semiconductor components like diodes and transistors, which limits the performance and cost-effectiveness of RFID tags across various frequency regimes.
Innovation Solution
The method involves forming semiconductor layers using silane ink on a dielectric layer over an electrically active substrate, integrating diodes, transistors, and capacitors in a single substrate without a single photolithography mask, and using a metal antenna with an interposer strap, dielectric layer, and oxide films to support and insulate the integrated circuitry, enabling low-cost, high-performance RFID tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional RFID tag manufacturing processes are used, then existing RFID tags can be produced, but the manufacturing cost is high and efficiency is low
Solution Approach 1:
The patent merges the formation of semiconductor layers, diodes, transistors, and capacitors into a single integrated process using silane ink deposition. Multiple components that traditionally require separate fabrication steps are combined into one unified manufacturing approach, reducing both cost and complexity while improving production efficiency
Solution Approach 2:
The silane ink-based process serves multiple functions simultaneously: it forms semiconductor layers, creates diode structures, forms transistor channels, and defines capacitor regions. This multi-functional approach eliminates the need for separate manufacturing processes for each component type, directly addressing the cost and efficiency contradictions
2Device complexity
If semiconductor components are integrated using conventional methods, then RFID tags can be manufactured, but the process is costly and complex
Solution Approach 1:
The patent combines the integration of diodes, transistors, and capacitors into a single substrate using one unified silane ink process. This merging eliminates the need for multiple separate integration steps and photolithography masks, directly reducing both process complexity and manufacturing cost
Solution Approach 2:
The invention employs silane ink as a low-cost, consumable material that can be deposited and processed in a single pass. This disposable approach to semiconductor layer formation replaces expensive, multi-step conventional processes, making the integration process both simpler and more cost-effective
3Reliability
If conventional semiconductor integration is used, then RFID tags can be produced, but electrical characteristics are degraded due to parasitic capacitance
Solution Approach 1:
The patent implements local quality by creating distinct regions on the substrate with different electrical characteristics. Diode regions, transistor regions, and capacitor regions are spatially separated and locally optimized, allowing each component to achieve its optimal electrical performance while minimizing parasitic effects from adjacent structures
Solution Approach 2:
The silane ink-based semiconductor layers serve as an intermediary structure that enables low-parasitic capacitance integration. The specific material properties and formation method of the silane-derived semiconductor layers reduce parasitic capacitance between components, improving overall electrical characteristics while maintaining integration
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 results in cost-effective, high-performance RFID tags capable of operating in LF, HF, UHF, and microwave frequency regimes with improved electrical characteristics and reduced parasitic capacitance, enabling efficient integration and attachment to antennas.
Implementation Method 1
forming semiconductor layers using silane ink on a dielectric layer
Data Source
AI summary
Radio frequency identification (RFID) tags and processes for manufacturing the same. The RFID device generally includes (1) a metal antenna and/or inductor; (2) a dielectric layer thereon, to support and insulate integrated circuitry from the metal antenna and/or inductor; (3) a plurality of diodes and a plurality of transistors on the dielectric layer, the diodes having at least one layer in common with the transistors; and (4) a plurality of capacitors in electrical communication with the metal antenna and/or inductor and at least some of the diodes, the plurality of capacitors having at least one layer in common with the plurality of diodes and/or with contacts to the diodes and transistors. The method preferably integrates liquid silicon-containing ink deposition into a cost effective, integrated manufacturing process for the manufacture of RFID circuits. Furthermore, the present RFID tags generally provide higher performance (e.g., improved electrical characteristics) as compared to tags containing organic electronic devices.