Parallel RFID Antenna on Metal Body for Gas Cylinder Tags
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Solution Overview
Problem
RFID tags affixed to metal bodies experience reduced communication characteristics and gain due to the conductor impairing the communication signal, and existing solutions lack robustness and suitable designs for applications like gas cylinders.
Innovation Solution
A wireless IC device with a loop conductor and RFIC element connected to a metal body, where the loop conductor's surface is parallel to the object's surface, maximizing current flow and enhancing robustness and communication gain by using a connection conductor to connect near the loop end, allowing the metal body to function as a radiator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the loop conductor is connected to the metal body to enhance communication characteristics, then the gain and communication distance are improved, but the structural robustness and compactness are compromised
Solution Approach 1:
The patent transitions from a perpendicular mounting configuration to a parallel configuration where the loop conductor's surface extends along the metal body surface. This dimensional change allows the antenna to maintain effective electromagnetic coupling with the metal body (improving gain) while remaining coplanar with the surface (maintaining robustness and compactness).
Solution Approach 2:
The patent changes the orientation parameter of the loop conductor from perpendicular to parallel relative to the metal body surface. This parameter change fundamentally alters how the antenna interacts with the metal body, enabling both improved communication characteristics through enhanced current flow and maintained structural robustness through coplanar positioning.
2Object-affected harmful factors
If the RFID tag is affixed away from the metal surface to avoid conductor interference, then the communication signal is preserved, but the communication gain and transmission distance are reduced
Solution Approach 1:
The patent converts the harmful effect of the metal body (which normally causes signal cancellation when tags are placed on it) into a beneficial effect by using the metal body as a ground plane and radiation element. The parallel configuration allows the metal body to enhance the antenna's radiation pattern and extend communication distance, transforming the conductor from a source of interference to a source of gain enhancement.
3Reliability
If the RFID tag projects from the metal body to achieve proper antenna orientation, then the communication characteristics are improved, but the robustness and suitability for applications like gas cylinders are compromised
Solution Approach 1:
The patent resolves the contradiction between communication performance and robustness by changing the mounting dimension from perpendicular (projecting) to parallel (coplanar). This allows the antenna to achieve effective electromagnetic coupling without protruding from the metal body surface, maintaining a sleek, robust profile suitable for applications like gas cylinders while preserving communication characteristics.
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 improves communication characteristics and robustness by maximizing current flow through the metal body, enhancing radio-frequency transmission performance and maintaining a compact, non-projecting design suitable for robust applications.
Implementation Method 1
an electrical length between the first input/output terminal and the second input/output terminal is about 1⁄2 of a wavelength of a communication signal; and an electrical length from a farthest end of the metal body based on the second end to the first input/output terminal is equal to or greater than about 1⁄2 of a wavelength of a communication signal
Implementation Method 2
the RFID tag not only to pick up radio waves but also to utilize the metal surface as a radiation element
Data Source
AI summary
In a wireless IC device, a columnar body includes a metal body with an insulating film. A loop-shaped antenna conductor is provided on an upper surface of the columnar body via an insulating pedestal. The loop surface of the antenna conductor is parallel or substantially parallel to the upper surface of the columnar body. On the lower surface of a RFIC element, two terminal electrodes are provided. The RFIC element is mounted on the antenna conductor such that the two terminal electrodes are connected to both ends of the antenna conductor, respectively. One end of the connecting conductor is connected to the vicinity of one end of the antenna conductor, and the other end of the connecting conductor is connected to the upper surface of the columnar body.