Accessory NFC Circuit Sliding Shield for Signal Collision Avoidance
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Solution Overview
Problem
Near Field Communication (NFC) circuits in mobile devices can experience interference and collisions due to overlapping signals from nearby NFC circuits, leading to unreliable data reception when an accessory with an NFC circuit is attached, potentially positioning itself between the device's NFC circuit and a targeted NFC device.
Innovation Solution
An accessory with a housing that slides onto a mobile device, featuring a pair of antennas and a signal comparator/charging circuit to manage signal levels, a conductive signal shield to prevent inductive coupling, and a transceiver that operates by inductive coupling with the device's NFC circuit to avoid interference, ensuring reliable communication by controlling data transmission based on proximity and power availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an accessory with NFC circuit is attached to the mobile device, then the accessory can provide additional NFC functionality and data storage, but the accessory's NFC circuit may interfere with the device's NFC circuit causing signal collisions and unreliable communication
Solution Approach 1:
A sliding mechanism is introduced as an intermediary between the accessory NFC circuit and the device NFC circuit. When the accessory is attached, the sliding mechanism positions the accessory NFC circuit at a specific distance and orientation relative to the device NFC circuit, reducing direct interference while still allowing controlled inductive coupling for power and communication when needed.
Solution Approach 2:
The NFC circuit configuration is made dynamic through the sliding mechanism. The accessory NFC circuit can be positioned at different distances from the device NFC circuit by sliding, allowing the system to adapt between modes: minimal interference when detached or partially attached, and controlled coupling when fully attached for power transfer and data communication.
2Productivity
If the accessory NFC circuit is positioned close to the device NFC circuit for effective communication, then data transmission is improved, but signal interference and collisions increase
Solution Approach 1:
The sliding mechanism creates different local configurations: when the accessory is fully attached, the NFC circuits are positioned at an optimal distance for communication; when partially attached or detached, the distance increases to reduce interference. This local variation in positioning allows the system to optimize for either communication efficiency or interference reduction depending on the attachment state.
Solution Approach 2:
The accessory is divided into separable components with the NFC circuit positioned on a sliding portion. This segmentation allows the NFC circuit to be independently positioned relative to the device NFC circuit, enabling controlled proximity for communication while minimizing interference through the sliding distance adjustment.
3Adaptability or versatility
If multiple NFC circuits are activated simultaneously, then more devices can communicate with the mobile device, but signal collisions occur making reception unreliable
Solution Approach 1:
The sliding mechanism acts as a physical intermediary that controls the coupling strength between the accessory NFC circuit and device NFC circuit. By adjusting the sliding position, the system can modulate the level of inductive coupling, allowing selective activation and reducing simultaneous interference from multiple NFC circuits while maintaining the ability to communicate with multiple devices sequentially.
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 effectively prevents interference between the accessory's NFC circuit and the device's NFC circuit, allowing for reliable communication with targeted NFC devices by optimizing signal transmission and reception, ensuring the device can interact with NFC tags or terminals without data collisions.
Implementation Method 1
The antenna is configured to be inductively coupled to the UE NFC circuit, and a transceiver configured to be powered by the antenna to operate
Implementation Method 2
The conductive signal shield may extend between the antenna and the UE NFC circuit to inhibit inductive coupling between the antenna and the UE NFC circuit
Data Source
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Figure 3
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AI summary
An accessory for a user equipment (UE) includes a housing and a near field communication (NFC) circuit. The housing is slid on the UE to become attached in a stored position relative to the UE. The NFC circuit is attached at a location on the housing and configured to become powered by inductive coupling to signals emitted by another NFC circuit within the UE to temporarily operate to transmit data to the other NFC circuit within the UE as the accessory NFC circuit passes over the other UE NFC circuit while the housing is being slid on the UE before reaching the stored position relative to the UE. While the housing is in the stored position relative to the UE, the NFC circuit may be configured to be inhibited from transmitting data to the other NFC circuit within the UE irrespective of whether the other NFC circuit within the UE is emitting signals to attempt to provide inductive coupling to the NFC circuit.