Single-Cell Dielectric Spectroscopy Using RF Coplanar Waveguides
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Solution Overview
Problem
Existing methods for dielectric spectroscopy of single biological cells face limitations in manufacturing simplicity, sensing frequency, and the ability to provide ultrafast detection of internal states or morphological states.
Innovation Solution
A label-free method and device using a coplanar waveguide with a micropore or channel for translocating biological cells, applying RF fields of at least 700 MHz, and a heterodyne mixing setup for down-converting RF signals to determine amplitude and phase changes for cell characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If open coaxial probe is used for dielectric spectroscopy measurement, then measurement can be performed on tissue samples, but the measurement result reflects average over macroscopic sample and cannot characterize single cell properties
Solution Approach 1:
The patent replaces the mechanical contact measurement approach (open coaxial probe) with a non-contact microwave resonator-based measurement system. The resonator couples electromagnetically with the sample without mechanical contact, enabling single cell measurement while simplifying the measurement setup. This substitution of mechanical measurement with electromagnetic field-based measurement resolves the contradiction between measurement precision and device complexity.
2Speed
If conventional dielectric spectroscopy methods are used, then basic dielectric properties can be measured, but ultrafast detection of internal states and morphological changes cannot be achieved
Solution Approach 1:
The patent employs frequency domain analysis by sweeping through multiple resonance frequencies of the microwave resonator. By measuring the complex impedance spectrum across a frequency range and analyzing the spectral features, the system achieves both ultrafast detection speed and precise internal state characterization. The frequency parameter variation enables discrimination of different cell internal states through their characteristic frequency responses.
Solution Approach 2:
The microwave resonator acts as an intermediary between the measurement system and the single cell sample. The resonator couples the incident microwave signals with the sample's dielectric properties, translating subtle internal state changes into measurable resonance frequency and quality factor variations. This intermediary enables ultrafast non-contact measurement of internal cellular states.
3Object-affected harmful factors
If label-free measurement is implemented, then non-invasive characterization is achieved, but sensitivity for detecting subtle cellular changes is reduced
Solution Approach 1:
The patent utilizes periodic microwave oscillation at resonator resonance frequencies to probe the sample. By measuring the periodic resonance response and analyzing parameters such as resonance frequency shift and quality factor change, the system achieves high sensitivity for detecting subtle cellular changes without labels. The periodic resonant excitation amplifies the interaction between the electromagnetic field and the sample's dielectric properties.
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
Enables ultrafast and high-throughput single cell determination with tomographic characterization, allowing for the detection of internal states and morphological changes in biological cells.
Implementation Method 1
applying RF fields of at least 700 MHz provided via an RF input port to the coplanar waveguide
Implementation Method 2
Dielectric spectroscopy is a method which was pioneered by Schwan who demonstrated that the electronic response of biological tissue, that is exposed to an AC field, has a rich frequency dependence
Implementation Method 3
a heterodyne mixing setup for down-converting RF signals to determine amplitude and phase changes for cell characterization
Data Source
Figure 1(a)~1(e)
Figure 2(a)~2(c)
Figure 3
AI summary
Provided is a label-free, single biological cell dielectric spectroscopy method, comprising the steps of: translocating a biological cell through a micropore or channel embedded in a substrate and interfaced with a coplanar waveguide while the biological cell experiences at least one RF field of at least 700 MHz provided via an RF input port to the coplanar waveguide; performing a time domain measurement of at least one RF signal reflected from or transmitted to a device under test (DUT); and determining an amplitude change and a phase change based on the reflected or transmitted at least one RF signal due to the translocating biological cell to determine an internal state or a morphological state of the biological cell.