Decoupled Antenna Layout for Non-Invasive Analyte Sensing
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Solution Overview
Problem
Current non-invasive analyte detection methods face challenges such as lack of specificity, interference from temperature fluctuations, skin compounds, and pigments, and complexity in device placement, particularly when using non-optical frequencies like radio or microwave bands for detecting analytes like glucose in biological tissues.
Innovation Solution
A non-invasive analyte sensor system utilizing decoupled transmit and receive antennas in radio or microwave frequency bands to minimize direct electromagnetic interference, allowing for accurate detection and notification of analyte presence or concentration by transmitting signals with multiple frequencies and using geometrically distinct antennas to ensure signal penetration and response measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional non-invasive detection methods are used, then analyte measurement is attempted, but specificity to the analyte of interest is poor and interference from temperature fluctuations, skin compounds, and pigments occurs
Solution Approach 1:
The system segments the electromagnetic spectrum into multiple frequency bands (e.g., first frequency band for penetration, second frequency band for detection). By dividing the detection process into multiple frequency components, the system can selectively measure analyte-specific spectral features while filtering out broadband interference from temperature, skin compounds, and pigments.
Solution Approach 2:
The system changes the frequency parameter of the electromagnetic signal to optimize detection. By transmitting signals at specific frequency bands and analyzing frequency-dependent absorption characteristics, the system enhances analyte specificity. The receiver detects frequency-specific absorption patterns that are unique to the target analyte, distinguishing it from interferents.
2Measurement precision
If non-optical frequencies are used for non-invasive detection, then signal penetration into tissue is improved, but direct electromagnetic coupling between transmit and receive antennas causes interference
Solution Approach 1:
The target tissue acts as an intermediary medium between the transmit and receive antennas. The system forces electromagnetic lines of force to travel through the target tissue rather than allowing direct antenna-to-antenna coupling. This intermediary path ensures that the received signal contains information about the analyte within the tissue, filtering out direct electromagnetic interference.
Solution Approach 2:
The system uses spatial dimensionality by positioning transmit and receive antennas at specific distances and orientations. By controlling the spatial separation and geometric arrangement, the system minimizes direct coupling while maximizing the path through the target tissue. The decoupling is achieved through intentional spatial configuration rather than direct contact.
3Measurement precision
If decoupled antennas with different geometries are used, then direct signal receipt is minimized and analyte detection is improved, but device complexity increases
Solution Approach 1:
The transmit and receive antennas are designed with different geometries (asymmetric configuration). This asymmetry prevents resonant coupling and minimizes direct electromagnetic energy transfer between antennas. The different geometric shapes ensure that the antennas are decoupled while maintaining their respective functions for signal transmission and reception through the target tissue.
4Measurement precision
If multiple frequency bands are transmitted, then analyte specificity is improved through spectral analysis, but energy consumption and system complexity increase
Solution Approach 1:
The system transmits electromagnetic signals in periodic pulses at different frequency bands rather than continuous transmission. This periodic multi-frequency approach allows spectral analysis for analyte detection while reducing overall energy consumption compared to continuous multi-frequency transmission. The pulsed nature enables time-multiplexed frequency scanning.
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 system effectively detects analytes with improved specificity and reduced interference, enabling accurate measurement and notification of analyte levels, including glucose, through the use of decoupled antennas that minimize direct signal receipt and maximize signal penetration into the target.
Implementation Method 1
transmit a generated transmit signal in a radio or microwave frequency range of the electromagnetic spectrum into a target containing an analyte of interest
Implementation Method 2
non-invasively detecting an analyte via spectroscopic techniques using non-optical frequencies such as in the radio or microwave frequency bands
Data Source
AI summary
A method for providing notification regarding one or more analytes includes detecting an amount of each of the one or more analytes using a non-invasive sensor, determining a notification to present based on the amount of at least one of the one or more analytes and notification criteria using a processor, and sending an instruction directing presentation of the notification. The method can further include presenting the notification. The notification can include vibration, sound, or visible components such as light, text, or images. The notification criteria can include upper thresholds, lower thresholds, or the analyte being within or outside of bounded ranges. Systems performing the method can include the sensor and optionally one or more of a mobile device and a remote server, and the notification can be presented in a device including the sensor or a separate device such as the mobile device.