AEPH Chip Interrogation Using Separate Fields to Limit Backscatter
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Solution Overview
Problem
Existing package tracking technologies, such as optical codes and RFID, face challenges in high-speed packaging environments due to line-of-sight alignment requirements and signal interference, limiting their ability to process items efficiently.
Innovation Solution
The implementation of ambient electromagnetic power harvesting (AEPH) systems with initialization and interrogation nodes that use separate electromagnetic fields to charge and read AEPH chips, minimizing backscatter and enabling faster processing of items by using different frequencies for charging and interrogation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If stronger electromagnetic fields are used to power RFID chips at high speeds, then power delivery to the chip is improved, but signal backscattering increases and interferes with reading the reply signal
Solution Approach 1:
The patent divides the electromagnetic field interaction into two separate frequency domains: a first frequency for power delivery (charging the AEPH chip) and a second frequency for data interrogation (reading reply signals). This frequency segmentation allows the power delivery function and signal reading function to operate simultaneously without interference, resolving the backscattering problem that occurs when a single frequency is used for both purposes
Solution Approach 2:
The system changes the frequency parameter of the electromagnetic field based on the operational phase: using a first frequency during the charging phase when strong fields are needed, and switching to a second frequency during the interrogation phase when signal reading is required. This dynamic parameter change enables the system to optimize power delivery while avoiding backscattering interference during data transmission
2Measurement precision
If optical codes are used for tracking, then item identification is achieved, but line-of-sight alignment is required which limits high-speed processing capability
Solution Approach 1:
The patent replaces the optical reading system (which requires precise mechanical alignment and line-of-sight) with an electromagnetic field-based RFID system. The AEPH chip uses electromagnetic coupling to communicate with the reader, eliminating the need for line-of-sight alignment and enabling high-speed processing without mechanical positioning requirements
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 allows for higher-speed item processing, enabling the tracking of a greater number of items per minute without interference, as the AEPH system effectively separates charging and reading functions, enhancing the efficiency of item tracking in high-speed packaging lines.
Implementation Method 1
an AEPH initialization node that emits a first electromagnetic field to charge the AEPH chip and/or initiate a boot-up sequence
Implementation Method 2
a AEPH interrogation node that transmits a second electromagnetic field (which can be at a different frequency from the first electromagnetic field) to trigger one or more processing operations within the AEPH chip including providing information from memory to the AEPH interrogation node
Data Source
AI summary
Systems and methods for performing high speed interactions with electromagnetic power harvesting (AEPH) chips are provided. In one embodiment, an AEPH initialization node emits a first electromagnetic field to charge the AEPH chip and/or initiate a boot-up sequence, and an AEPH interrogation node that transmits a second electromagnetic field to trigger processing operations within the AEPH chip. The first electromagnetic field and second electromagnetic fields are emitted respectively within an AEPH initialization zone and an AEPH interrogation zone that are offset from each other such that the first electromagnetic field emission in the AEPH initialization zone does not produce backscatter that interferes with the AEPH interrogation node receiving interrogation reply signals from the AEPH interrogation zone. Curtailing backscatter facilitates the ability to convey items with AEPH chips at faster line speeds so that a greater number of items per minute can be processed.