Double Coil RFID Transceiver in Shielded Housing
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Solution Overview
Problem
Existing RFID systems with shielded housings face challenges in transmitting data with sufficient signal strength due to the interference and attenuation caused by the housing materials, particularly metallic components, which hinder effective communication between NFC tags and reading devices.
Innovation Solution
The implementation of a device with a double coil configuration within the shielded housing creates a transmission area with reduced shielding effect, allowing for targeted directional electromagnetic flux guidance through the housing, using a transceiver connected to an RFID memory chip and a reading device, and incorporating a resonance circuit for optimal signal coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielded housing is used to protect the RFID memory chip, then protection against environmental influences and electromagnetic interference is improved, but signal transmission strength and communication reliability deteriorate
Solution Approach 1:
The housing is designed with differentiated shielding properties: most of the housing provides strong electromagnetic shielding, while specific local areas (transmission openings) have reduced or no shielding to allow signal passage. This creates optimal conditions for both protection and communication by applying different shielding qualities to different parts of the housing structure.
Solution Approach 2:
Transmission openings serve as intermediary structures that mediate between the shielded interior environment and the external electromagnetic field. These openings allow electromagnetic signals to pass through the otherwise shielded housing, enabling communication while maintaining overall shielding protection for the RFID chip.
2Object-affected harmful factors
If a transmission opening is provided in the shielded housing, then signal transmission capability is improved, but electromagnetic shielding effectiveness deteriorates
Solution Approach 1:
The housing structure implements local quality differentiation by providing transmission openings only in specific areas where signal transmission is required, while maintaining full shielding in all other areas. This selective approach preserves electromagnetic shielding effectiveness overall while enabling necessary signal transmission at designated locations.
Solution Approach 2:
The housing is segmented into shielded regions and unshielded transmission regions. The transmission openings are strategically positioned and sized to allow signal passage while minimizing impact on overall shielding. The double coil antenna system is also segmented with one coil inside the housing and one outside, with the transmission opening positioned between them to facilitate controlled signal transfer.
3Ease of operation
If a double coil configuration is used to guide electromagnetic flux through the transmission area, then directional signal transmission is improved, but device complexity increases
Solution Approach 1:
The double coil configuration implements a nested arrangement where one coil is positioned inside the shielded housing and the other coil is positioned outside. The transmission opening is nested between these two coils, creating a focused electromagnetic flux path. This nested structure enables directional signal transmission while keeping the overall device configuration relatively compact and integrated.
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 solution enables reliable, cost-effective, and efficient wireless data transmission and reception from an RFID memory chip housed in a shielded environment, overcoming the limitations of signal attenuation and interference, ensuring robust communication.
Implementation Method 1
two coil bodies coupled to one another are positioned and/or coupled to one another in the electromagnetically shielded housing in such a way that the transmission region provided in the housing can be penetrated by the generated electromagnetic fields
Implementation Method 2
incorporating a resonance circuit for optimal signal coupling
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a device (1) for wirelessly transmitting and receiving data of an RFIF tag (8) introduced in an electromagnetically shielded housing (4), wherein a transmission region (3) is provided in the housing wall (40) of the housing (4) and wherein a transceiver (6) connected to the RFID tag (8) is also provided, which is designed to transmit and/or receive data from the RFID tag (8) through the transmission region (3), wherein a double coil (2) formed by two coil assemblies (2A, 2B) is provided directly above or below the transmission region (3) for coupling to an external receiving unit (10) of a reading device and for coupling to the transceiver (6).