Security Tag Antenna Beam Design for RF Interference Reduction
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Solution Overview
Problem
Conventional security tags experience reduced RF performance due to the integration of electronic components and technologies such as Acousto-magnetic, RFID, NFC, batteries, and Wi-Fi, which hinder their functionality and capabilities.
Innovation Solution
A security tag design featuring a tack housing, a tag housing, and antenna elements extending between them, with the antenna elements positioned away from the electrical components to minimize interference, utilizing a beam made from plastic or polymer materials and an actuator for secure engagement, enabling enhanced RF performance and multi-directional radiation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic components and technologies (RFID, NFC, Wi-Fi, batteries) are integrated into security tags to enhance functionalities, then the capabilities and features of security tags are improved, but the RF performance is degraded due to interference and cross-talk from these components
Solution Approach 1:
The antenna elements are extracted and positioned in a separate beam structure away from the electronic components housed in the tag housing. This physical separation removes the source of RF interference from proximity to sensitive electronic components, thereby maintaining RF performance while allowing integration of multiple technologies.
Solution Approach 2:
A beam made from plastic or polymer material serves as an intermediary structure that houses the antenna elements and connects the tack housing to the tag housing. This intermediary structure provides physical separation and isolation between the antenna elements and electronic components, reducing cross-talk and interference while maintaining structural integrity.
2Volume of moving object
If antenna elements are placed close to electronic components to reduce size, then the device size is minimized, but cross-talk and interference increase, degrading RF performance
Solution Approach 1:
The antenna elements are positioned in a separate spatial dimension by extending them in a beam that connects the tack housing and tag housing, rather than placing them in the same housing space as electronic components. This dimensional separation reduces interference while maintaining compact overall device size.
Solution Approach 2:
The beam structure acts as an intermediary that physically separates antenna elements from electronic components while maintaining connection between housing parts. This intermediary structure minimizes harmful electromagnetic interactions while preserving device compactness.
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 design maintains and enhances RF performance by creating additional distance between antenna elements and electrical components, reducing cross-talk and interference, thereby improving the range and sensitivity of the security tag, allowing it to effectively incorporate multiple technologies like RFID, NFC, and Wi-Fi without compromising functionality.
Implementation Method 1
The one or more antenna elements are electrically connected with one or more electrical components housed within the tag housing. at least a portion of the one or more antenna elements is disposed away from the one or more electrical components
Data Source
AI summary
The present disclosure relates to security tags for an electronic article surveillance system deployed in a retail environment. The security tag is a single piece security tag that comprises a tack housing and a tag housing connected by a beam. The beam is enabled to house one or more antenna elements that is electrically connected with one or more electronic components housed within the tag housing. Alternatively, one or more antenna elements can be housed within the tack housing, wherein engagement of the tack housing with the tag housing enables the one or more antenna elements to receive electrical signals from the one or more electronic components via a tack.