RF Tag Cavity Mounting for Conductor Interference
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Solution Overview
Problem
Existing RF tags face issues with damage from collisions and interference when exposed on surfaces, and communication failures when near conductors due to resonance frequency shifts and irradiation limitations.
Innovation Solution
An RF tag design featuring a helical free space antenna exposed outside a cavity, a closed space antenna supported by a substrate within the cavity, and a cap for waterproofing, allowing the conductor-made member to function as an antenna with adjustable resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RF tag is exposed on the surface to enhance reading accuracy, then communication performance is improved, but the RF tag is vulnerable to damage from collision
Solution Approach 1:
The RF tag is nested within a cavity of a conductor-made member, with only the necessary antenna portion exposed. This nesting approach protects the vulnerable electronic components while maintaining the necessary communication functionality through the exposed antenna.
2Reliability
If the RF tag is mounted in a cavity to protect from damage, then reliability is improved, but reading accuracy may deteriorate
Solution Approach 1:
The RF tag is nested within a cavity of a conductor-made member, with only the necessary antenna portion exposed. This nesting approach protects the vulnerable electronic components while maintaining the necessary communication functionality through the exposed antenna.
Solution Approach 2:
The antenna is extracted from the enclosed cavity and exposed to the outside environment. This extraction allows the antenna to receive carrier waves effectively while the rest of the RF tag remains protected within the cavity.
3Power
If the RF tag approaches a conductor to enhance communication, then signal strength is improved, but resonance frequency shifts occur
Solution Approach 1:
The substrate acts as an intermediary between the closed space antenna and the conductor-made member, maintaining a specific distance to prevent harmful interactions. This intermediary positioning stabilizes the resonance frequency while allowing effective communication.
Solution Approach 2:
The patent transitions from surface mounting to cavity mounting, changing the spatial dimension from two-dimensional surface to three-dimensional cavity space. This dimensional change allows the RF tag to be positioned at an optimal distance from conductors, stabilizing resonance frequency.
4Ease of operation
If electric waves are irradiated to the back side surface of an attached RF tag, then communication is enabled, but this limits mounting flexibility
Solution Approach 1:
The conductor-made member serves multiple functions: it provides mechanical support, acts as a shield, and functions as an antenna element. This multi-functionality eliminates the need for specific irradiation directions, enhancing mounting flexibility.
Solution Approach 2:
The RF tag and conductor-made member are merged into an integrated structure where the conductor-made member's cavity houses the RF tag. This merging allows communication from multiple directions and eliminates the limitation of back-side surface irradiation requirements.
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 RF tag is protected from damage, maintains high communication performance by utilizing the conductor-made member as an antenna, and enhances reception/transmission sensitivity with omnidirectional features and adjustable resonance.
Implementation Method 1
The closed space antenna, the substrate, and the conductor-made member constitute a capacitor portion, and a resonance frequency is adjusted by adjusting a capacitance of the capacitor portion.
Implementation Method 2
a resonance circuit; wherein a portion of the free space antenna is exposed from the cavity to an outside... a resonance frequency is adjusted by adjusting a capacitance of the capacitor portion
Data Source
AI summary
There is provided an RF tag that can be mounted in a cavity of a member formed of a conductor having the cavity therein, and has high communication performance. An RF tag 1 of the present invention is an RF tag that is mounted in a cavity 101 of a conductor-made member 100 having the cavity 101 therein, and includes at least a free space antenna 10, a resonance circuit 20, an IC chip 30, a closed space antenna 40, and a substrate 50 for supporting the closed space antenna, a portion of the free space antenna is exposed from the cavity to the outside, and the substrate supports the closed space antenna so that the closed space antenna is not in contact with the inner surface of the conductor-made member. The closed space antenna, the substrate and the conductor-made member forms a capacitor portion C2.