RFID Transponder Label Antenna for Fill-Level Frequency Shifts
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Solution Overview
Problem
Existing RFID labeling technologies face challenges in reliably identifying small containers with varying fill levels and proximity to dissipative media, leading to frequency shifts that can prevent communication with readers.
Innovation Solution
A transponder label with a carrier layer and an RFID functional unit featuring meander-shaped antenna arms electromagnetically coupled to form multiple resonance frequencies, allowing reliable identification despite environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional RFID antenna structure is used, then the labeling is simple and cost-effective, but the RFID communication becomes unreliable due to frequency shifts caused by varying fill levels and proximity to dissipative media
Solution Approach 1:
The antenna structure is divided into multiple independent meander-shaped antenna arms (first and second antenna arms) that are arranged in parallel and electromagnetically coupled. Each antenna arm can be independently designed and optimized, allowing the system to provide multiple resonance frequencies while maintaining manufacturing simplicity through modular construction
Solution Approach 2:
The patent changes the geometric parameters of the antenna structure by introducing meander-shaped antenna arms with specific dimensions, spacing, and coupling configurations. By adjusting the length, width, and spacing of these arms, multiple resonance frequencies are achieved, enabling reliable RFID communication across varying fill levels and environmental conditions
2Adaptability or versatility
If the antenna structure is designed to provide multiple resonance frequencies, then reliable identification is achieved despite environmental changes, but the antenna structure becomes more complex
Solution Approach 1:
The antenna structure is designed to perform multiple functions simultaneously: it provides multiple resonance frequencies (at least two different resonance frequencies) to adapt to varying fill levels, maintains electromagnetic coupling for signal transmission, and achieves reliable RFID communication across different environmental conditions. This multi-functionality is achieved through the parallel arrangement of meander-shaped antenna arms with specific coupling configurations
Solution Approach 2:
The antenna structure is designed to dynamically adapt to changing conditions (varying fill levels) by providing multiple resonance frequencies. The electromagnetic coupling between the meander-shaped antenna arms allows the system to maintain at least one resonance frequency within the reader's reading range regardless of the container's fill level or proximity to dissipative media
3Reliability
If a single resonance frequency is used, then the antenna structure is simple, but communication fails when frequency shifts occur due to fill level changes
Solution Approach 1:
The antenna is segmented into multiple meander-shaped arms that can be manufactured using standard PCB or printed circuit techniques. Each arm is a simple geometric pattern that can be easily fabricated, and the overall structure maintains manufacturing simplicity while providing multiple resonance frequencies through the parallel arrangement and electromagnetic coupling of these segments
Solution Approach 2:
The patent achieves multiple resonance frequencies by changing geometric parameters (length, width, spacing) of the antenna arms rather than introducing complex additional components. This parameter-based approach maintains ease of manufacture by using standard fabrication processes while achieving the reliability needed for varying fill levels
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
Ensures reliable RFID communication across varying fill levels and environmental conditions by utilizing multiple resonance frequencies within the reader's range, reducing material costs and handling difficulties.
Implementation Method 1
The antenna structure further comprises an antenna loop arranged between and coupled to the first and second antenna sections. At least one of the two antenna sections comprises a first meander-shaped antenna arm and a second meander-shaped antenna arm, which are arranged at a predetermined distance from each other and electromagnetically coupled to each other.
Implementation Method 2
The specifically designed and adjacent meandering antenna arms are inductively and capacitively coupled with each other, so that a controlled mode increase is set up and the antenna structure realizes a multimodal RFID antenna with several resonance frequencies.
Data Source
AI summary
A transponder label (2) for a container (3) comprises a carrier layer (20), and an RFID functional unit comprising an RFID chip (18) and an antenna structure (10) coupled thereto, which are coupled to the carrier layer (20). The antenna structure (10) has a first antenna section (11), a second antenna section (12) and an antenna loop (17), which is arranged between the first and second antenna sections (11, 12) and is coupled thereto. At least one of the two antenna sections (11, 12) comprises a first meander-shaped antenna arm (13) and a second meander-shaped antenna arm (14), which are arranged at a predetermined distance (D1, D2, D3) from each other and are electromagnetically coupled to each other.