Planar Metamaterial Based Microwave Sensor Arrays for Biomedical Analysis and Treatment

Vargas, Margarita Puentes

doi:10.1007/978-3-319-06041-5

Cited by 32 publications

(3 citation statements)

References 6 publications

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“…For example, metamaterial-based microwave and terahertz sensors have been used in biomedical analyses. [185,186] In ultrasound imaging applications, graded metamaterials are demonstrated to be useful for enhanced sensitivity [187,188] and aberration correction. [187,189] Because of the large potential of metamaterials and the importance of biology and medicine in the contemporary society, we anticipate that more work will be done to bring the technology into real-life products.…”

Section: Biomedical Applicationsmentioning

confidence: 99%

Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

et al. 2021

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Cellular solids have gained extensive popularity in different areas of engineering due to their unique physical and mechanical properties. Recent advancements in manufacturing technologies have led to the development of cellular solids with highly controllable microstructures and properties modulated for multiple functionalities at low structural weights. The concept of density gradation in cellular solids has recently gained attention due to its potentials in opening new doors to the development of lightweight structures that offer optimal physical and mechanical properties without compromising their favorable characteristics. Herein, a comprehensive insight into the fundamental concepts, fabrication, and current and potential applications of density‐graded cellular solids in various areas of science and engineering is provided. Cellular solids are broadly classified into two main categories: foams and lattice structures. An overview of the fundamental concepts in each category is presented, followed by details on the characterization approaches and some of the most novel processing techniques utilized in fabricating the structures. The uses of density‐graded structures in load‐bearing, acoustic, and biomedical applications are highlighted. The state of the art in each category and the current trends in application‐specific optimization of density‐graded structures are discussed. The review concludes with an outlook of the future directions in this exciting field.

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Section: Biomedical Applicationsmentioning

confidence: 99%

Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

et al. 2021

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“…This is broad expansion of more basic iterations of this technique that monitors arrays of pressure sensors via planar readout coils, [ 24,37 ] or the radiation of an array of temperature sensors. [ 38,39 ] In our study, RF signal is first mediated by passive intermediate relay coils that are wireless and electrically disconnected from other elements. This can transfer signal over intermediate distances, and can be fused onto textiles [ 40–42 ] or conform over surfaces.…”

Section: Introductionmentioning

confidence: 99%

Programmable Multiwavelength Radio Frequency Spectrometry of Chemophysical Environments through an Adaptable Network of Flexible and Environmentally Responsive, Passive Wireless Elements

Dautta

Hajiaghajani

et al. 2022

Small Science

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Readout of multiparametric environmental signals typically uses discrete sensing formats that individually require unique signal conditioning circuitry and/or processing pathways. Here, adaptable sensor networks composed exclusively of passive material architectures that enable spectrometric comonitoring of chemical or physical environmental signals are proposed. Herein, a single radio frequency (RF) reader wirelessly interacts first with an intermediate wireless relay coil—this is tunable in length and can be designed to conform around surfaces. This relay (that is fused on textiles or surfaces) is then wirelessly coupled to arrays of passive RF sensors with individually programmable flexibility/reactivity to environmental signals. Multiple chemical and physical signals can then be monitored within the single spectral readout of a wearable reader. This technique can probe over tunable length scales, and is robust to mechanical disturbances that limit present techniques. As a proof of concept, this approach is used to comonitor chemophysical metrics such as nutrients, temperature, pressure, pH, and more on the skin or in utensils with a single readout. This technique may form a cornerstone of zero‐microelectronic sensor networks.

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“…Most microwave resonant sensors are implemented by loading a transmission line with a planar resonator (the sensing element), and the most usual working principle is frequency variation [2], [4], [6], [10], [16]- [20]. Nevertheless, sensors based on symmetry truncation, including frequency-splitting sensors [8], [21]- [25], coupling-modulation sensors [26]- [35], and differential sensors [9], [13]- [15], [36] have also been reported.…”

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confidence: 99%

Frequency-Variation Sensors for Permittivity Measurements Based on Dumbbell-Shaped Defect Ground Structures (DB-DGS): Analytical Method and Sensitivity Analysis

Muñoz-Enano¹,

Vélez²,

Gil

et al. 2022

IEEE Sensors J.

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It is shown in this paper that a microstrip line loaded with a dumbbell-shaped defect ground structure (DB-DGS) is useful for complex permittivity measurements. The working principle of the sensor is the variation in the notch (resonance) frequency and depth caused by the material under test (MUT), when it is put in contact with the sensitive region of the device, i.e., the capacitive slot. It is demonstrated that the relative sensitivity of the sensor, defined as the variation of the resonance frequency of the DB-DGS with the dielectric constant of the MUT relative to the resonance frequency of the bare structure, does not depend on the geometry of the DB-DGS, provided the substrate is thick enough. The relative sensitivity, the key figure of merit, is dictated by the equivalent dielectric constant of the substrate, and it increases as the substrate permittivity decreases. Using the circuit model of the sensing structure, simple analytical expressions providing the dielectric constant and the loss tangent of the MUT are derived. Such analytical formulas depend on the notch frequency and depth of the sensor with and without MUT in contact with it, i.e., easily measurable quantities. The analysis carried out is corroborated through full-wave electromagnetic simulation and experiments.

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Planar Metamaterial Based Microwave Sensor Arrays for Biomedical Analysis and Treatment

Cited by 32 publications

References 6 publications

Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

Programmable Multiwavelength Radio Frequency Spectrometry of Chemophysical Environments through an Adaptable Network of Flexible and Environmentally Responsive, Passive Wireless Elements

Frequency-Variation Sensors for Permittivity Measurements Based on Dumbbell-Shaped Defect Ground Structures (DB-DGS): Analytical Method and Sensitivity Analysis

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