Loop-Dipole RFID Antenna for Denture Detection
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Solution Overview
Problem
Existing RFID systems for detecting lost dentures have limited detection ranges and are not suitable for embedding in dentures due to size and impedance matching issues, especially in varying dielectric conditions such as water, which affects the antenna's ability to communicate effectively with the RFID chip.
Innovation Solution
A loop-dipole antenna with tuning patches is embedded in dentures, allowing for efficient communication with UHF RFID readers over long distances by matching the antenna's input impedance to the microchip, even in the presence of dielectric materials, and is designed to maintain performance in different environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If existing RFID tags with long reading range are used, then detection distance is improved, but the antenna becomes bulky and unsuitable for embedding in dentures
Solution Approach 1:
The antenna is divided into two functional segments: a loop portion and a dipole portion. This segmentation allows each segment to be optimized independently - the loop provides magnetic coupling for extended range while the dipole provides electric coupling for impedance matching, achieving long detection distance without requiring a single large antenna structure that would be too bulky for denture embedding
Solution Approach 2:
The patent transitions from traditional linear dipole antennas to a three-dimensional loop-dipole hybrid structure. The loop portion introduces a new spatial dimension (magnetic field coupling) complementing the traditional dipole's electric field coupling, enabling extended detection range in multiple spatial dimensions without increasing overall antenna footprint
2Reliability
If existing RFID tags are embedded in dentures, then denture identification is improved, but impedance matching fails under varying dielectric conditions such as water
Solution Approach 1:
The patent employs tuning patches that can be adjusted to change the electrical parameters (capacitance and inductance) of the antenna system. By modifying these parameters, the antenna's input impedance can be matched to the RFID chip across varying dielectric conditions, maintaining reliable communication whether the denture is in air, water, or other environments
Solution Approach 2:
Tuning patches serve as intermediary elements between the loop-dipole antenna and the RFID chip. These patches mediate the impedance transformation, adapting the antenna's input impedance to match the chip's requirements under different dielectric conditions, thereby ensuring reliable signal coupling regardless of whether the denture is immersed in water or air
3Volume of moving object
If miniaturized transponders are used for denture identification, then device size is reduced for embedding, but detection range is limited to 2-4 inches
Solution Approach 1:
The transponder uses a segmented loop-dipole antenna structure where the loop portion (providing magnetic coupling for extended range) and dipole portion (providing electric coupling for compactness) are separated into distinct functional segments. This allows the overall transponder to maintain miniaturized dimensions while achieving detection ranges up to 20 feet through the complementary action of both segments
Solution Approach 2:
The patent creates a composite antenna structure combining two different antenna types (loop and dipole) into a single hybrid system. This composite structure leverages the strengths of both antenna types - the loop's magnetic field coupling for extended range and the dipole's electric field coupling for efficient impedance matching - achieving long detection range within a miniaturized form factor suitable for denture embedding
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 enables reliable detection and identification of lost dentures at distances of up to 20 feet, even when immersed in water, by ensuring the antenna remains tuned to the microchip, thus addressing the limitations of existing systems.
Implementation Method 1
The antenna is used for communication with the reader and the microchip is used for storing and processing information, modulating and demodulating a radio-frequency signal
Implementation Method 2
tuning procedures for matching the embedded antenna's input impedance to the impedance of an RFID tag microchip under varying dielectric conditions
Data Source
AI summary
A radio frequency identification (RFID) system for detecting and identifying lost dentures in a facility, includes readers deployed in fixed locations in the facility. Each of the readers is configured to transmit a first signal and to detect from a distance a second signal, which is generated at an RFID transponder embedded in a denture in response to receiving the first signal by backscattering a part of the first signal. The second signal contains information related to the denture, including an identification of the denture owner. The RFID system also includes a first server located within the facility. The first server is configured to communicate with the readers over a network in the facility and to control operations of the readers. Each of the readers sends the information related to the denture to the first server when it detects the second signal from the RFID transponder.