Loop Antenna Conductor for Detection Wafers
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Solution Overview
Problem
Detection wafers with dipole antennas are sensitive to dielectrically or electrically conductive objects, leading to detuning of the antenna resonance frequency, which affects reading range, especially when used near biological tissues or in moist environments.
Innovation Solution
A loop-shaped antenna conductor is used, which concentrates the magnetic component of the electromagnetic field, reducing the impact of dielectric and conductive objects, and is attached to a carrier using embroidery or wire laying technology, allowing for a balanced current distribution and increased resonance width, enabling a greater reading range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If dipole antennas are used for detection wafers in UHF and SHF range, then the reading range is extended, but the sensitivity to dielectrically or electrically conductive objects increases, leading to detuning of antenna resonance frequency
Solution Approach 1:
The patent changes the antenna geometry from a dipole configuration to a loop configuration, fundamentally altering the electromagnetic field distribution. This parameter change transforms the antenna's interaction with dielectric and conductive objects, reducing sensitivity to such objects while maintaining extended reading range capabilities.
Solution Approach 2:
Instead of using a dipole antenna that is sensitive to dielectric and conductive objects, the patent inverts the approach by using a loop antenna that concentrates magnetic field components. This inverted configuration is less affected by the presence of biological tissues or moisture, thereby stabilizing the antenna resonance frequency while maintaining reading range.
2Reliability
If the antenna conductor is loop-shaped, then the magnetic component of the electromagnetic field is concentrated, but the geometric circumference must be optimized to achieve resonance
Solution Approach 1:
The patent specifies that the geometric circumference of the antenna loop should be a single or multiple of lambda half of the reading device's wavelength. This parameter optimization enables resonance at the desired frequency while maintaining concentrated magnetic field components, achieving both reliable field strength and practical resonance conditions.
3Adaptability or versatility
If detection wafers are used in moist environments or on body, then the identification capability is maintained, but the electrical component of the electromagnetic field is absorbed by tissues and materials
Solution Approach 1:
The patent changes the antenna configuration to a loop shape, which concentrates the magnetic component of the electromagnetic field. Since magnetic fields are not absorbed by non-ferromagnetic materials like biological tissues or moisture, this parameter change enables maintenance of identification capability in moist environments and on-body applications without significant energy loss.
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 a reading range that is less influenced by nearby conductive objects, maintaining a sufficient electromagnetic field strength, even in the presence of biological tissues or moisture, and is resistant to mechanical and chemical stresses.
Implementation Method 1
If the antenna conductor is loop-shaped, the magnetic component of the electromagnetic field is more concentrated than if the antenna conductor is elongated
Implementation Method 2
The parallel ends form a capacitance layer which, compared to opposite ends, leads to a flatter voltage maximum and thus to a balanced current distribution and an increase in the magnetic component of the electromagnetic field
Implementation Method 3
the resonance width of the resonant circuit formed by the antenna loop is increased
Implementation Method 4
these tissues or materials lead to an absorption of the electrical component of the electromagnetic field
Data Source
Figure 1~2
AI summary
A description is given of a small detection plate, comprising a chip module and an antenna module. A chip of the chip module is coupled to an antenna conductor of the antenna module via a coupling loop. The antenna conductor is an antenna loop and consists of a wire embodied as at least one turn and mechanically connected to the second carrier by textile embroidering technology or by wire laying technology. In this case, adjacent turns and the ends of the wire are insulated from one another.