Distributed RFID Antenna Layout for Low-Profile Wearable Scanning
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Solution Overview
Problem
Traditional wearable devices with integrated RFID components become bulky and interfere with daily activities due to their stacked configuration, making them impractical for wearing on fingers or the back of the hand.
Innovation Solution
Distribute RFID antennas across a user's fingers and wrist, with one antenna facing inward and the other outward, and utilize a processor to activate the appropriate antenna based on the location or type of RFID object, enhancing flexibility and comfort while reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RFID components (electronic module, RFID radio, RFID antenna, batteries) are implemented together in a stacked configuration, then all necessary components are integrated in one device, but the device becomes too bulky, thick, tall, and heavy to be practically worn on fingers or the back of the hand
Solution Approach 1:
The wearable device is divided into multiple separate components: an electronic module worn on one finger and RFID antennas distributed across other fingers. This segmentation allows each component to be small and lightweight while collectively providing full functionality, resolving the contradiction between integration and wearability.
Solution Approach 2:
The patent transitions from a three-dimensional stacked configuration to a distributed spatial arrangement across multiple fingers. By utilizing the dimensional space of the hand and fingers, the system achieves functional integration without volumetric accumulation, making the device practical for wear.
2Adaptability or versatility
If a single RFID antenna is used in the wearable device, then the device structure is simple, but it cannot effectively communicate with RFID tags in various orientations (inward facing vs. outward facing)
Solution Approach 1:
Different fingers are equipped with RFID antennas having different directional characteristics (inward-facing vs. outward-facing). Each antenna is optimized for its specific location and orientation, enabling effective communication with RFID tags regardless of whether they are on the inside or outside of the hand, thus achieving orientation-agnostic RFID communication.
Solution Approach 2:
The distributed antenna system provides universal RFID communication capability in both inward and outward directions simultaneously. Rather than requiring different devices for different orientations, the multi-antenna configuration enables a single wearable device to handle all RFID communication scenarios.
3Ease of operation
If components are distributed across fingers and wrist, then flexibility and comfort are improved, but the device requires more complex interconnections (e.g., Bluetooth) which may increase interference with wrist and knuckle movements
Solution Approach 1:
Bluetooth technology serves as an intermediary communication medium between the distributed RFID antennas on fingers and the electronic module on the wrist or another finger. This wireless intermediary eliminates the need for physical cables that would constrain movement, thereby maintaining flexibility and comfort while enabling component coordination.
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 distributed antenna configuration lowers the wearable device's profile, improves comfort, and minimizes interference with wrist and knuckle movements, allowing for efficient RFID communication in various orientations.
Implementation Method 1
having a directional radiation pattern oriented for reading RFID tags
Data Source
AI summary
Example wearable devices having multiple distributed radio frequency identification (RFID) antennas are disclosed. A disclosed example wearable device includes a first RFID antenna; a second RFID antenna; a processor configured to activate one of the first RFID antenna or the second RFID antenna based upon at least one of a location or a type of an RFID object external to the wearable device; and a body, wherein an RFID radio, the first RFID antenna, and the second RFID antenna are disposed at respective positions along the body. The wearable device may include the RFID radio, wherein, when the wearable device is worn, the RFID radio and the processor are disposed at one or more fingers of a user's hand, the first RFID antenna is disposed at an upper side of the user's hand, and the second RFID antenna is disposed at a user's wrist.