Decoupled Antenna Design for Non-Invasive Analyte Detection
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Solution Overview
Problem
Current non-invasive analyte detection methods using spectroscopic techniques face challenges such as lack of specificity, interference from temperature fluctuations and skin compounds, and complexity in device placement, particularly when measuring analytes like glucose in biological tissues.
Innovation Solution
A non-invasive analyte sensor utilizing decoupled transmit and receive antennas operating in radio or microwave frequency bands, with intentional geometric differences and appropriate spacing to minimize direct electromagnetic coupling, allowing for accurate detection of analytes by maximizing signal penetration into the target while minimizing direct signal receipt by the receive antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmit and receive antennas are coupled together, then the receive antenna can directly receive the transmit signal, but the detection specificity is reduced and direct signal interference occurs
Solution Approach 1:
The antenna system is segmented into distinct transmit and receive antenna elements with different geometries. The transmit antenna has a first geometry optimized for signal transmission, while the receive antenna has a second geometry optimized for signal reception. This segmentation prevents direct coupling between transmit and receive paths, thereby improving analyte detection specificity by eliminating direct signal leakage.
Solution Approach 2:
The patent employs asymmetric antenna geometries where the transmit antenna and receive antenna have intentionally different configurations. This asymmetry creates directional radiation patterns and impedance characteristics that minimize direct coupling between the antennas while maximizing their respective transmission and reception efficiencies, thus improving measurement precision without excessive complexity.
2Use of energy by moving object
If the transmit antenna transmits strong signals, then the signal penetration into the target is maximized, but the direct signal received by the receive antenna increases causing interference
Solution Approach 1:
The target medium (biological tissue) serves as an intermediary between the transmit and receive antennas. The transmit antenna sends signals through the target, and the receive antenna detects signals that have interacted with the target. This intermediary arrangement ensures that strong transmit signals are necessary for adequate penetration, but the received signals are predominantly from target interaction rather than direct coupling, reducing electromagnetic interference.
Solution Approach 2:
Different regions of the electromagnetic field are optimized for different functions. The transmit antenna creates a local field distribution optimized for penetration into the target, while the receive antenna is positioned and configured to locally detect signals emerging from the target. This local quality differentiation allows strong transmission without proportionally increasing direct interference at the receiver.
3Ease of operation
If conventional non-invasive methods are used, then the measurement can be performed on biological tissue, but the detection suffers from interference from temperature fluctuations and skin compounds
Solution Approach 1:
The system performs preliminary signal processing and calibration to account for environmental factors before final analyte detection. By establishing baseline measurements and compensation algorithms in advance, the system can distinguish between signals caused by temperature fluctuations or skin compounds and those caused by the target analyte, thereby maintaining measurement accuracy in non-invasive conditions.
Solution Approach 2:
The system incorporates feedback mechanisms where the received signals are continuously analyzed and compared against reference values. This feedback allows the system to compensate for interference from temperature fluctuations and skin compounds by adjusting detection parameters or subtracting known interference patterns, thereby improving analyte detection accuracy while maintaining non-invasive operation.
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 decoupling technique enhances the sensor's ability to detect analytes with improved specificity and reduced interference, enabling accurate measurement of analyte presence and concentration without the need for invasive procedures.
Implementation Method 1
transmit a generated transmit signal that is in a radio or microwave range of the electromagnetic spectrum into a target
Implementation Method 2
detect a response resulting from transmission of the transmit signal by the transmit antenna into the target
Data Source
AI summary
A method of non-invasive detection of an analyte includes generating a transmit signal having at least two frequencies each of which is a radio or microwave frequency range of the electromagnetic spectrum, and transmitting the transmit signal into a target containing at least one analyte of interest using at least one transmit antenna/element. At least one receive antenna/element is used to detect response that results from transmitting the transmit signal by the at least one transmit antenna/element into the target containing the at least one analyte of interest. The at least one transmit antenna/element and the at least one receive antenna/element are less than 95% coupled to one another, or less than 90% coupled to one another, or less than 85% coupled to one another, or less than 75% coupled to one another.