Nested Planar RFID Antenna for 3D Tag Detection
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Solution Overview
Problem
Existing RFID/NFC antenna devices require complex structures and multiple antenna elements to achieve reliable detection of tags in any three-dimensional position or orientation, often resulting in incomplete coverage and reduced sensitivity.
Innovation Solution
A flat RFID/NFC antenna device with nested or stacked antenna units, each having orthogonal directivity axes, allowing for comprehensive coverage in all three spatial directions through overlapping electromagnetically active areas, enabling efficient communication with tags regardless of orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antenna elements are used to achieve reliable detection in any three-dimensional position, then coverage and sensitivity are improved, but device complexity increases
Solution Approach 1:
The patent implements nested antenna units where smaller antenna elements are positioned within the structure of larger antenna elements. This nesting approach allows multiple antenna functions to be integrated into a compact planar structure, achieving three-dimensional coverage without proportionally increasing overall device complexity. The nested configuration enables overlapping electromagnetically active areas that provide isotropic sensitivity while maintaining a simplified structural organization.
Solution Approach 2:
The patent transitions from traditional three-dimensional antenna arrays to a planar two-dimensional structure by utilizing stacked or nested antenna units with orthogonal directivity axes. This dimensional transformation allows the antenna system to achieve three-dimensional coverage capability while maintaining a flat, simplified structure that is easier to manufacture and integrate into devices.
2Area of stationary object
If multiple antenna elements are used to achieve comprehensive coverage, then coverage area is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple antenna units with orthogonal directivity axes into a single planar structure with nested or stacked configurations. This merging approach integrates multiple functional elements into one unified component, achieving comprehensive three-dimensional coverage while simplifying manufacturing processes. The combined structure eliminates the need for separate assembly of multiple independent antenna elements, reducing manufacturing complexity.
Solution Approach 2:
The patent achieves comprehensive coverage area through a planar two-dimensional layout of nested antenna units rather than extending physical dimensions in three directions. This approach maintains a compact form factor that is easy to manufacture and integrate, while the orthogonal directivity axes of stacked units provide the necessary three-dimensional coverage capability.
3Ease of manufacture
If a planar antenna structure is used, then ease of manufacture is improved, but sensitivity in arbitrary three-dimensional orientation is reduced
Solution Approach 1:
The patent uses nested antenna units within a planar structure, where each nested unit contributes orthogonal directivity axes. This nesting configuration allows the planar structure to generate three-dimensional electromagnetic field coverage, achieving orientation-independent sensitivity while maintaining manufacturing simplicity. The overlapping active areas of nested units ensure adequate field strength in all spatial directions.
Solution Approach 2:
The patent achieves three-dimensional sensitivity from a two-dimensional planar structure by utilizing stacked antenna units with orthogonal directivity axes. This dimensional transformation allows the planar antenna to project electromagnetic fields in multiple spatial directions, maintaining ease of manufacture while achieving reliable detection in arbitrary three-dimensional orientations.
4Adaptability or versatility
If nested or stacked antenna units with orthogonal directivity axes are used, then three-dimensional coverage is improved, but device complexity increases
Solution Approach 1:
The patent implements nested antenna units where simpler structural elements are positioned within larger antenna structures, sharing common support and mounting infrastructure. This nesting approach achieves three-dimensional coverage capability while avoiding the complexity of completely independent antenna assemblies. The shared structural framework reduces overall device complexity despite the enhanced spatial coverage capability.
Solution Approach 2:
The patent merges multiple antenna units with orthogonal directivity axes into a single integrated planar structure. This combination achieves comprehensive three-dimensional coverage while simplifying the overall device architecture by eliminating separate mounting structures and control systems for individual antennas. The unified structure reduces device complexity while maintaining versatile spatial coverage.
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
The solution provides reliable and isotropic sensitivity over a two-dimensional plane, allowing for efficient communication with RFID/NFC tags in any three-dimensional position, simplifying the structure and production while maintaining high sensitivity and coverage.
Implementation Method 1
Near Field Communication (NFC) is an international transmission standard based on RFID technology for the contactless exchange of data via electromagnetic induction using loosely coupled coils over short distances
Data Source
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AI summary
The invention relates to an RFID/NFC antenna device (10) for reading and/or communicating with an RFID/NFC tag (12) in any three-dimensional position or orientation, comprising an antenna assembly (14) and a control unit (16), wherein the antenna assembly (14) is formed planarly in an X/Y axis plane (18), in particular on a planar plate (20) in an X/Y axis plane (18). The antenna assembly (14) comprises at least one, in particular two, nested and/or stacked antenna units (22), wherein the at least one antenna unit (22) has two mutually orthogonally aligned directionality axes in the X and Z axis directions and/or in the Y and Z axis directions.It is proposed that at least one antenna unit (22) comprises at least two mutually overlapping antenna loops (24), each antenna loop (24) having at least three adjacent and electromagnetically active regions (25) of the orthogonally aligned directivity axes, the regions (25) of each antenna loop being delimited from one another by individual conductor sections (30) of the antenna loop (24), and the associated regions (25) of the two antenna loops (24) substantially overlapping. In a related aspect, the invention relates to a method for operating such an RFID/NFC antenna device (10) in which the antenna units (22) are switched sequentially or combinatorially selectively until optimized inductive coupling with the NFC/RFID tag (12) in any position above the X/Y axis plane (18) is achieved.