Multilayer Inductor Layout for Tolerant Turn Overlap Control
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Solution Overview
Problem
Existing multilayer antennas for RFID transponders face challenges in miniaturization due to size and shape constraints, which affect the resonant frequency and require precise alignment of turns to maintain performance.
Innovation Solution
The design incorporates an inductor with conductive layers having turns with varying widths in the overlap area, allowing for tolerance compensation in layer positioning and enabling precise control of the resonant frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multilayer antennas are used to miniaturize RFID transponders, then the size of the transponder is reduced, but the alignment precision of turns between layers becomes critical and difficult to maintain
Solution Approach 1:
The patent applies asymmetry by making the turns of different layers have different widths. Specifically, the first turn has a first width and the second turn has a second width that is different from the first width. This asymmetric design creates an overlapping area where the turns partially overlap when superimposed, which compensates for positioning tolerances and reduces the criticality of alignment precision during manufacturing.
Solution Approach 2:
The patent applies local quality by creating a specific overlapping area where the turns of different layers partially overlap. This overlapping area is positioned at a specific location (such as the inner side or outer side of the turns) and has different geometric properties compared to non-overlapping areas. This localized feature allows the antenna to tolerate positioning variations while maintaining consistent electrical characteristics and resonant frequency.
2Ease of manufacture
If conventional manufacturing processes are used for multilayer antennas, then production flexibility is maintained, but resonant frequency control precision deteriorates due to positioning tolerances
Solution Approach 1:
The asymmetric turn widths create an overlapping area that acts as a tolerance buffer. This design allows conventional manufacturing processes with standard positioning tolerances to be used while still achieving precise resonant frequency control, because the overlapping region ensures that minor positioning variations do not significantly affect the electrical characteristics of the antenna.
Solution Approach 2:
The patent controls the resonant frequency by carefully selecting and adjusting geometric parameters of the antenna, including the different widths of turns in different layers, the positioning of the overlapping area, and the dimensions of conductive bridges. By optimizing these parameters, the invention achieves precise resonant frequency control despite variations introduced by conventional manufacturing processes.
3Measurement precision
If turns of different layers are perfectly aligned, then resonant frequency accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The asymmetric turn widths inherently create an overlapping area that compensates for misalignment. This design eliminates the need for complex alignment control mechanisms, as the overlapping geometry naturally tolerates positioning variations. The different widths ensure that even when turns are not perfectly aligned, there is still sufficient overlapping area to maintain the desired electrical characteristics and resonant frequency accuracy.
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 the miniaturization of RFID transponders while maintaining the desired resonant frequency, improving manufacturing flexibility and reducing production costs.
Implementation Method 1
In the area of superimposition of said turns, the width of the section of the first turn is greater than the width of the section of the second turn
Data Source
AI summary
The invention provides an inductor (1) comprising at least one first conductive layer (4a) comprising at least one first turn (5) of conductive material and at least one second conductive layer (4b) comprising at least one second turn (5) of conductive material, at least one conductive bridge (7) connecting the first and second turns (5), a layer of insulating material (6a) being interposed at least partially between the first and second turns (5), the first and second turns (5) being at least partially superimposed in the stacking direction (Z) of said layers (4a, 4b, 6a), characterized in that, in the area of superimposition of said turns, the width (I1) of the section of the first turn (5, 4a) is greater than the width (I2) of the section of the second turn (5, 4b).