RFID Antenna Coil with Vertical Parallel Plate Electrodes
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Solution Overview
Problem
RFID media face challenges in meeting standards for antenna coil design due to the need for wiring patterns that connect parallel plate electrodes, which can disrupt radiation efficiency and compliance with specific shape standards, especially when parallel plate electrodes are centrally disposed within the antenna coil.
Innovation Solution
A contactless information medium is designed with a spiral antenna coil, IC chip, and parallel plate electrodes arranged to accommodate the standard constraints, where the plate electrodes are positioned to ensure balanced placement around the antenna coil, allowing for an opening while maintaining efficient electrical connections through a jumper portion, thus enhancing radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parallel plate electrodes are disposed substantially centrally in an opening formed inside an antenna coil, then the capacitance portion can be provided, but the requirements of the standard cannot be met and the area of the opening becomes insufficient
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where capacitance electrodes occupy central space to a three-dimensional configuration where electrodes are positioned on opposite surfaces of the substrate. This vertical stacking allows the capacitance portion to coexist with the antenna coil opening without reducing the opening area, as electrodes are distributed through the thickness dimension rather than competing for planar space.
Solution Approach 2:
The capacitance portion is segmented into multiple components: a first plate electrode on the first surface, a second plate electrode on the second surface, and a dielectric layer between them. This segmentation allows the capacitance function to be distributed across different spatial locations and layers, enabling the opening area to remain sufficient while still providing the required capacitance functionality.
2Reliability
If wiring pattern is used to connect parallel plate electrodes to antenna coil, then capacitance portion can be formed, but it is difficult to meet the requirements of the standard for antenna coil design
Solution Approach 1:
The patent merges the connection function into the antenna coil structure itself. The antenna coil is configured to directly connect to the first and second plate electrodes, eliminating the need for separate wiring patterns. This integration reduces structural complexity while maintaining the capacitance portion's functionality, as the antenna coil serves dual purposes: wireless communication and electrical connection to capacitance electrodes.
Solution Approach 2:
The antenna coil is designed with multi-functionality, serving both as the wireless communication antenna and as the connection pathway to the parallel plate electrodes. This universal design eliminates the need for dedicated wiring patterns, reducing overall device complexity while ensuring proper electrical connectivity for the capacitance portion.
3Reliability
If the area of the opening of the antenna coil is insufficient, then the radiation efficiency of the antenna decreases
Solution Approach 1:
By positioning capacitance electrodes on opposite surfaces of the substrate rather than within the planar opening area, the invention utilizes the thickness dimension to accommodate the capacitance portion. This ensures the opening area remains sufficiently large for optimal radiation efficiency while the capacitance function is fulfilled through the vertically distributed electrode structure.
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 allows for reliable wireless communication while adhering to shape standards, ensuring high-frequency signal propagation and reducing variations in electric characteristics, thereby improving the overall performance and reliability of the RFID medium.
Implementation Method 1
an antenna coil disposed on a first surface of the film base and formed in a spiral shape to perform wireless communication with an external device
Implementation Method 2
a capacitance portion capable of propagating high-frequency signals using parallel plate electrodes
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3
AI summary
A contactless communication medium 10 includes a film base 11, an antenna coil 14 disposed on a top surface 11 a of the film base 11 and formed in a rectangular spiral shape, an IC chip 12 performing wireless communication processing via the antenna coil 14, first plate electrodes 15 and 16 connected to an inner end 14a and an outer end 14b of the antenna coil 14, and second plate electrodes 17 and 18 disposed on a rear surface 11b of the film base 11 so as to be opposite to the first plate electrodes 15 and 16 in the thickness direction of the film base 11. The first plate electrodes 15 and 16 and the second plate electrodes 17 and 18 have a first electrode portion and a second electrode portion respectively extending along a long side direction and a short side direction of the antenna coil 14 so as to be adjacent to an inner periphery or an outer periphery of the antenna coil 14 when viewed perpendicular to the film base 11.