scholarly journals Computational microwave imaging using 3D printed conductive polymer frequency‐diverse metasurface antennas

2017 ◽  
Vol 11 (14) ◽  
pp. 1962-1969 ◽  
Author(s):  
Okan Yurduseven ◽  
Patrick Flowers ◽  
Shengrong Ye ◽  
Daniel L. Marks ◽  
Jonah N. Gollub ◽  
...  
Keyword(s):  
Conductive Polymer ◽  
Microwave Imaging ◽  
3D Printed

scholarly journals Development of an Anthropomorphic Phantom of the Axillary Region for Microwave Imaging Assessment

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4968
Author(s):  
Matteo Savazzi ◽  
Soroush Abedi ◽  
Niko Ištuk ◽  
Nadine Joachimowicz ◽  
Hélène Roussel ◽  
...  
Keyword(s):  
Complex Permittivity ◽  
Current Knowledge ◽  
Conductive Polymer ◽  
Microwave Imaging ◽  
Good Representation ◽  
Axillary Lymph ◽  
Experimental Assessment ◽  
Imaging Technology ◽  
Axillary Region ◽  
3D Printed

We produced an anatomically and dielectrically realistic phantom of the axillary region to enable the experimental assessment of Axillary Lymph Node (ALN) imaging using microwave imaging technology. We segmented a thoracic Computed Tomography (CT) scan and created a computer-aided designed file containing the anatomical configuration of the axillary region. The phantom comprises five 3D-printed parts representing the main tissues of interest of the axillary region for the purpose of microwave imaging: fat, muscle, bone, ALNs, and lung. The phantom allows the experimental assessment of multiple anatomical configurations, by including ALNs of different size, shape, and number in several locations. Except for the bone mimicking organ, which is made of solid conductive polymer, we 3D-printed cavities to represent the fat, muscle, ALN, and lung and filled them with appropriate tissue-mimicking liquids. Existing studies about complex permittivity of ALNs have reported limitations. To address these, we measured the complex permittivity of both human and animal lymph nodes using the standard open-ended coaxial-probe technique, over the 0.5 GHz–8.5 GHz frequency band, thus extending current knowledge on dielectric properties of ALNs. Lastly, we numerically evaluated the effect of the polymer which constitutes the cavities of the phantom and compared it to the realistic axillary region. The results showed a maximum difference of 7 dB at 4 GHz in the electric field magnitude coupled to the tissues and a maximum of 10 dB difference in the ALN response. Our results showed that the phantom is a good representation of the axillary region and a viable tool for pre-clinical assessment of microwave imaging technology.

PLA conductive filament for 3D printed smart sensing applications

2018 ◽  
Vol 24 (4) ◽  
pp. 739-743 ◽  
Author(s):  
Simone Luigi Marasso ◽  
Matteo Cocuzza ◽  
Valentina Bertana ◽  
Francesco Perrucci ◽  
Alessio Tommasi ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Low Cost ◽  
Conductive Polymer ◽  
Temperature Characteristic ◽  
Temperature Sensors ◽  
Electrical Performance ◽  
Content Type ◽  
Sensing Applications ◽  
3D Printed

Purpose This paper aims to present a study on a commercial conductive polylactic acid (PLA) filament and its potential application in a three-dimensional (3D) printed smart cap embedding a resistive temperature sensor made of this material. The final aim of this study is to add a fundamental block to the electrical characterization of printed conductive polymers, which are promising to mimic the electrical performance of metals and semiconductors. The studied PLA filament demonstrates not only to be suitable for a simple 3D printed concept but also to show peculiar characteristics that can be exploited to fabricate freeform low-cost temperature sensors. Design/methodology/approach The first part is focused on the conductive properties of the PLA filament and its temperature dependency. After obtaining a resistance temperature characteristic of this material, the same was used to fabricate a part of a 3D printed smart cap. Findings An approach to the characterization of the 3D printed conductive polymer has been presented. The major results are related to the definition of resistance vs temperature characteristic of the material. This model was then exploited to design a temperature sensor embedded in a 3D printed smart cap. Practical implications This study demonstrates that commercial conductive PLA filaments can be suitable materials for 3D printed low-cost temperature sensors or constitutive parts of a 3D printed smart object. Originality/value The paper clearly demonstrates that a new generation of 3D printed smart objects can already be obtained using low-cost commercial materials.

scholarly journals A Tomograph Prototype for Quantitative Microwave Imaging: Preliminary Experimental Results

2018 ◽  
Vol 4 (12) ◽  
pp. 139 ◽  
Author(s):  
Alessandro Fedeli ◽  
Manuela Maffongelli ◽  
Ricardo Monleone ◽  
Claudio Pagnamenta ◽  
Matteo Pastorino ◽  
...  
Keyword(s):  
Ad Hoc ◽  
Microwave Imaging ◽  
Experimental Results ◽  
Network Analyzer ◽  
Reconstruction Algorithms ◽  
Quantitative Reconstruction ◽  
Qualitative And Quantitative ◽  
Switching Matrix ◽  
3D Printed ◽  
Transmission Measurements

A new prototype of a tomographic system for microwave imaging is presented in this paper. The target being tested is surrounded by an ad-hoc 3D-printed structure, which supports sixteen custom antenna elements. The transmission measurements between each pair of antennas are acquired through a vector network analyzer connected to a modular switching matrix. The collected data are inverted by a hybrid nonlinear procedure combining qualitative and quantitative reconstruction algorithms. Preliminary experimental results, showing the capabilities of the developed system, are reported.

scholarly journals Three dimensional printed degradable and conductive polymer scaffolds promote chondrogenic differentiation of chondroprogenitor cells

2020 ◽  
Vol 8 (15) ◽  
pp. 4287-4298
Author(s):  
Aruna Prasopthum ◽  
Zexing Deng ◽  
Ilyas M. Khan ◽  
Zhanhai Yin ◽  
Baolin Guo ◽  
...  
Keyword(s):  
Chondrogenic Differentiation ◽  
Conductive Polymer ◽  
Three Dimensional ◽  
Polymer Scaffolds ◽  
Polymer Scaffold ◽  
Conductive Material ◽  
Chondroprogenitor Cells ◽  
3D Printed

We report a conductive and biodegradable 3D printed polymer scaffold that promotes chondrogenic differentiation of chondroprogenitor cells. The conductive material consists of tetraniline-b-polycaprolactone-b-tetraaniline and polycaprolactone.

Advanced 3D Printed Conductive Polymer Nanocomposites for Electromagnetic Shielding

2021 ◽  
Author(s):  
Milad Kamkar ◽  
Majed Amini ◽  
Saeed Ghaderi ◽  
Ahmadreza Ghafarkhah ◽  
Amirhossein Ahmadian Hosseini ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Conductive Polymer ◽  
Electromagnetic Shielding ◽  
3D Printed
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