RFID Crate with Wraparound Antenna for Stacked Read
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Solution Overview
Problem
Conventional RFID devices face challenges in communicating with RFID inlays embedded in crates made of RF-unfriendly materials, such as water or metal, especially when stacked together, due to signal blocking or detuning, which complicates data retrieval and limits read range.
Innovation Solution
An RFID-enabled crate design featuring an RFID inlay on one side and a secondary antenna extending along another side, capacitively or inductively coupled to improve signal reach and orientation independence, allowing communication even when inlays are buried within a stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RFID inlays are embedded in crates made of RF-unfriendly materials, then the crates can be constructed with desired materials, but signal blocking or detuning occurs which complicates data retrieval and limits read range
Solution Approach 1:
A secondary antenna is introduced as an intermediary element between the RFID inlay and the reader. This external antenna extends along another side of the crate and is capacitively or inductively coupled to the RFID inlay, serving as a mediator to transmit RF signals through or around RF-unfriendly materials when the primary inlay antenna is blocked or detuned.
Solution Approach 2:
The solution moves from a single-point RFID inlay embedded in one side of the crate to a distributed antenna system where the secondary antenna extends along another side of the crate. This spatial dimensionality change allows signal transmission from multiple locations, increasing the probability of successful communication regardless of crate orientation or material composition.
2Device complexity
If RFID inlays are embedded in only one side of the crate, then the device complexity is reduced, but the crates must be manually repositioned to ensure readable orientation
Solution Approach 1:
The RFID communication function is segmented between the primary RFID inlay embedded in one side of the crate and the secondary antenna extended along another side. This segmentation allows each component to serve specific directional purposes, collectively providing omnidirectional read capability without requiring manual repositioning of the entire crate.
Solution Approach 2:
The secondary antenna is designed to perform multiple functions: it serves as an alternative transmission path when the primary inlay is blocked, extends the read range in multiple orientations, and provides redundancy for reliable communication. This multi-functionality eliminates the need for manual crate repositioning while maintaining relatively simple device structure.
3Productivity
If crates are stacked together, then storage efficiency is improved, but signal blocking between stacked crates complicates data retrieval
Solution Approach 1:
By extending the secondary antenna along another side of the crate rather than relying solely on the embedded inlay in one side, the system creates multiple spatial pathways for signal transmission. When crates are stacked, signals can propagate through gaps between crates or around edges, maintaining communication reliability while preserving storage efficiency.
Solution Approach 2:
The secondary antenna acts as an intermediary that bridges the gap between the RFID inlay and the reader when direct line-of-sight is blocked by stacked crates. It captures and retransmits signals through alternative paths, enabling data retrieval from stacked configurations without compromising storage density.
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
Enhances communication reliability and range by ensuring that RFID inlays can be read from multiple sides, even when the crates are randomly oriented, without the need for manual repositioning or complex mechanical adjustments.
Implementation Method 1
capacitively coupled to the RFID inlay
Implementation Method 2
capacitively or inductively coupled to improve signal reach
Data Source
AI summary
A radio frequency identification (RFID) enabled crate (50) includes: a plurality of sides (52); an RFID inlay (54) supported on a first one of the plurality of sides; and an antenna (56) coupled to the RFID inlay (54). Suitably, the antenna (56) extends at least partially across at least a second one of the plurality of sides (52), the second one of the sides being different from the first one where the RFID inlay (54) is located.