RFID Tag Wiring Layout for Longer, More Stable Read Range
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Solution Overview
Problem
RFID tags with functional modules face challenges in optimizing the electrical length of connection wiring to enhance communicable distance and reduce variance, as existing designs often result in inefficient radio wave absorption and varied communication distances.
Innovation Solution
The RFID tag incorporates a circuit board with an antenna conductor and an RFID IC, where the electrical length of the connection wiring between the functional module and the circuit board is within ±10% of a half wavelength of the radio signal, and the lead wires are arranged to minimize absorption of radiated radio waves by being bound in a configuration that avoids strong electric field areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrical length of connection wiring is not optimized, then the structure is simpler to manufacture, but the communicable distance is reduced and variance increases
Solution Approach 1:
The patent applies parameter changes by optimizing the electrical length of connection wiring to be within ±10% of an integral multiple of half wavelength of the radio signal. This specific parameter control transforms the wiring from a passive connection into an active element that resonates with the radio frequency, thereby extending communicable distance and reducing signal loss without fundamentally changing the manufacturing process.
Solution Approach 2:
The patent introduces dynamics by making the wiring length adjustable or selectable from multiple predetermined lengths. This allows the system to adapt to different frequency bands and application requirements, enabling the same RFID tag structure to achieve optimal performance across various operating conditions while maintaining reliable communication.
2Reliability
If lead wires are arranged without considering radio wave absorption, then the manufacturing process is simpler, but the communication distance and signal strength are reduced
Solution Approach 1:
The patent applies local quality by creating different spatial zones for lead wire placement. Specifically, the lead wires are positioned in areas where the electric field strength is minimal, such as along the ground plane or in shielded regions. This localized optimization ensures that the lead wires do not absorb or disrupt the radio waves in the antenna's high-field zones, thereby maintaining communication distance without adding significant manufacturing complexity.
Solution Approach 2:
The patent introduces an intermediary element, such as a ground plane or shielding structure, that mediates between the lead wires and the radio wave propagation path. This intermediary protects the lead wires from being exposed to strong electric fields while still allowing them to perform their electrical connection function, thus preventing signal degradation without complicating the overall device structure.
3Reliability
If connection wiring length varies significantly, then manufacturing is easier with less precision control, but the communicable distance varies widely
Solution Approach 1:
The patent applies parameter changes by establishing a specific tolerance range (±10% of half wavelength) for the connection wiring length. This parameter control ensures that the wiring remains within the resonant frequency range, maintaining consistent communicable distance across production batches. The tolerance is set wide enough to accommodate normal manufacturing variations but narrow enough to ensure reliable performance.
Solution Approach 2:
The patent introduces beforehand cushioning by designing the connection wiring with built-in compensation for manufacturing tolerances. This may include using flexible wiring materials that can accommodate length variations, or designing the electrical length to be less sensitive to small changes in physical length. This cushioning approach allows manufacturers to produce wirings within a broader tolerance range while still achieving consistent communication performance.
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 configuration extends the communicable distance while reducing variance, as demonstrated by communication tests showing improved performance when the electrical length of the connection wiring matches the half wavelength and the lead wires are bound to avoid overlapping with the antenna conductor's strong electric fields.
Implementation Method 1
an electrical length of a connection wiring that electrically connects the functional module to an element on the circuit board is within ±10% of an integral multiple of a half wavelength of a radio signal that the RFID IC transmits or receives
Implementation Method 2
the lead wires are arranged to minimize absorption of radiated radio waves by being bound in a configuration that avoids strong electric field areas
Data Source
AI summary
An RFID tag includes a circuit board, an RFID IC and a functional module. The circuit board has an antenna conductor. The RFID IC is mounted on the circuit board. The functional module is connected to the circuit board through a lead wire. An electrical length of a connection wiring that electrically connects the functional module to an element on the circuit board is within ±10% of an integral multiple of a half wavelength of a radio signal that the RFID IC transmits or receives.