RF Probe Alignment with Passive Tag Using Multi-Coil Segmentation
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Solution Overview
Problem
Passive RF tags face challenges in efficient energy scavenging and data communication due to the limitations of single-frequency power transfer and alignment issues between RF probes and tags, which affect the reliability and efficiency of power transfer and data exchange.
Innovation Solution
The use of multiple conductive coils in both RF probes and passive tags, allowing for separate frequencies for power transfer and data communication, along with alignment mechanisms such as notched indentations and trapezoidal shapes to ensure proper coil alignment, enables efficient energy scavenging and data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-frequency RF field is used for both power transfer and data communication, then the device complexity is reduced, but the reliability of power transfer and data communication deteriorates due to interference and efficiency limitations
Solution Approach 1:
The patent divides the RF communication system into separate frequency channels: one frequency (e.g., 13.56 MHz) dedicated to power transfer and another frequency (e.g., 2.4 GHz or 5.8 GHz) dedicated to data communication. This segmentation eliminates interference between power and data operations, improving reliability while maintaining manageable device complexity through modular coil design.
Solution Approach 2:
The RF probe and passive tag are designed with multiple conductive coils that can operate at different frequencies simultaneously. Each coil pair is tuned to specific frequencies for optimized power transfer and data communication, allowing the system to perform multiple functions (power transfer, bidirectional data communication) with high efficiency and reliability.
2Reliability
If alignment mechanisms such as notched indentations and trapezoidal shapes are added to ensure proper coil alignment, then the reliability of power transfer and data communication is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs asymmetric geometric features such as notched indentations and trapezoidal shapes on the passive tag and corresponding features on the RF probe. These asymmetric alignment features guide the RF probe into the correct position and orientation relative to the passive tag, ensuring optimal coil alignment for both power transfer and data communication while adding minimal complexity to the overall device design.
3Productivity
If multiple conductive coils are used in both RF probes and passive tags for separate frequencies, then the efficiency of power transfer and data communication is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates alignment features (notched indentations, trapezoidal shapes) that pre-position the RF probe and passive tag in the correct orientation before the actual power transfer and data communication operations begin. This preliminary alignment action ensures that the multiple conductive coils are properly positioned relative to each other, reducing the stringency of manufacturing precision requirements while maintaining high productivity.
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 solution enhances the reliability and efficiency of power transfer and data communication between RF probes and passive tags, ensuring consistent operation and secure data processing, even in tamper-proof applications.
Implementation Method 1
a first conductive coil to receive RF energy at a first frequency
Implementation Method 2
a second conductive coil to transmit data signals at a second frequency for bidirectional data communication
Data Source
AI summary
A passive tag embedded in a package includes multiple conductive coils. A first coil receives radio frequency (RF) energy used to power the tag. Additional coils receive and/or transmit data signals, clock signals, and carrier signals. The RF energy and other signals may be at different frequencies. An RF probe includes a first coil to emit the RF energy to power the tag. The RF probe includes additional coils corresponding to the additional coils in the tag. The RF probe may turn off the RF signal used for power during communication. The RF energy may be rectified to provide DC power to circuits in the tag, or may be used directly for adiabatic circuits. The RF probe and the package may have complementary shapes to facilitate alignment of the coils.