RFID Transponder Housing with Step for Mechanical Stress Reduction
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Solution Overview
Problem
Passive RFID transponders are vulnerable to mechanical stresses, particularly at the slot region of the antenna, which can lead to deformation and damage, limiting their durability and functionality under environmental and industrial conditions.
Innovation Solution
The design features a housing with a step on its outer face, where the second housing part is arranged above the antenna, creating a gap that reduces mechanical stress transmission, and the antenna is fastened exclusively by the first housing part, enhancing robustness and protection against deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the housing extends from one side of the slot to the other and the coupling loop is arranged directly above the slot, then the reading distance is increased, but the housing becomes vulnerable to mechanical stresses and deformation
Solution Approach 1:
The housing is divided into two distinct parts: a first housing part that extends across the slot and provides mechanical support, and a second housing part that is arranged above the antenna but separated by a gap. This segmentation allows the first housing part to bear mechanical loads while the second housing part maintains the required reading distance without being subjected to the same mechanical stresses.
Solution Approach 2:
The first housing part acts as an intermediary structure that supports the antenna and coupling loop assembly while protecting the second housing part from mechanical stresses. The fastening connection between the first housing part and the antenna/coupling loop assembly serves as a mediator that transfers and distributes mechanical loads away from the slot region.
2Stability of the object's composition
If the antenna is fastened directly to the housing across the slot region, then structural stability is improved, but mechanical stresses cause deformation and damage to the housing and components
Solution Approach 1:
The housing is segmented into two parts with different functions: the first housing part provides structural stability and mechanical support for the antenna, while the second housing part maintains the required distance from the slot region to ensure reliability under mechanical stress. This segmentation allows each part to optimize for its specific function.
Solution Approach 2:
Different regions of the housing have different properties: the first housing part has high mechanical strength and structural rigidity to support the antenna, while the second housing part is positioned to minimize mechanical stress exposure. The fastening structure also exhibits local quality by providing secure attachment at the first housing part while creating a protective gap at the second housing part.
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 significantly reduces mechanical stress on the housing, protecting the RFID chip and coupling loop from deformation and environmental damage, allowing for reliable operation over larger distances and in harsh conditions, such as industrial cleaning processes.
Implementation Method 1
a coupling loop which is arranged in said housing and is electrically connected to an RFID chip
Implementation Method 2
having an antenna which consists of a flat metal piece and has a slot and is arranged on an outer face of the housing
Data Source
AI summary
The housing of an RFID transponder, which is attached to a slot antenna, is protected against mechanical stresses and/or reduced mechanical stresses that act on the housing at least to such an extent that damage to the housing and the components arranged therein is prevented. To this end the antenna includes a first antenna part and a second antenna part, which are separated from each other by a slot, at least in one region of the antenna. The housing is composed of a first housing part and a second housing part, wherein the second housing part is arranged over the second antenna part, at least in some regions. The housing is fixed to the first antenna part solely by the first housing part. The housing has at least one step on the outer side directed toward the antenna, such that the height of the second housing part is at least 0.5 mm less than the height of the first housing part.