Article
Engineering, Electrical & Electronic
Chaitanya Narendra, Puyan Mojabi
Summary: A phaseless Gauss-Newton inversion (PGNI) algorithm has been developed for microwave imaging applications, which differs from traditional inversion methods by using magnitude-only total field data. The algorithm is augmented with three forms of regularization, one for cases with no prior information and two for incorporating prior information about the objects being imaged. Testing of the PGNI, SL-PGNI, and SP-PGNI inversion algorithms was conducted using synthetic and experimental phaseless total field data.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Geochemistry & Geophysics
Feng Han, Miao Zhong, Junjie Fei
Summary: This article presents an efficient and accurate 3-D quantitative hybrid microwave imaging method. By combining LSM and FWI, it achieves higher reconstruction accuracy and lower computational cost. Inserting a trained CNN U-Net between LSM and BIM further improves the obtained shapes.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Sulayman Joof, Semih Dogu, Egemen Bilgin, Mehmet Cayoren
Summary: An antipodal Vivaldi antenna optimized for microwave torso imaging in a specific coupling medium is proposed, showing better performance compared to other antennas, and validated using a realistic human torso model.
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2021)
Article
Engineering, Electrical & Electronic
Ondrej Fiser, Vojtech Hruby, Jan Vrba, Tomas Drizdal, Jan Tesarik, Jan Vrba, David Vrba
Summary: This paper presents a compact UWB bowtie antenna and balun circuit for medical MWI applications. The antenna has low reflection coefficient, high radiation efficiency, and can successfully reconstruct images.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Mathematics, Applied
Yosra Boukari, Houssem Haddar, Nouha Jenhani
Summary: We revisit the differential sampling method proposed in (Haddar and Nguyen 2017 Comput. Math. Appl. 74 2831-55) for identifying a periodic domain and a local perturbation. We provide a theoretical justification for the method that does not require the assumption of the local perturbation being periodic. Our theoretical framework utilizes functional spaces with continuous dependence on the Floquet-Bloch variable. The key aspect of the analysis is the validation of the generalized linear sampling method for a single Floquet-Bloch mode in this setting.
Article
Chemistry, Multidisciplinary
Ayman M. Qashlan, Rabah W. Aldhaheri, Khalid H. Alharbi
Summary: In this paper, a compact and flexible Vivaldi antenna is designed and utilized in a microwave breast imaging experiment using a nine-antenna array. By collecting backscattered signals, the image of the breast phantom can be reconstructed to identify and locate tumors accurately, regardless of their size.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Marija Nikolic Stevanovic, Jelena Lj. Dinkic, Antonije R. Djordjevic
Summary: An algorithm for localizing and estimating electrically small targets using sparse processing framework and vector electric-field measurements has been developed. Equivalent electric and magnetic dipoles are used to model the sources of the electromagnetic field, with l(1) regularization applied to find their locations and complex amplitudes. The method includes a normalization scheme and an algorithm to find the optimal regularization coefficient, leading to improved numerical stability and performance.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Food Science & Technology
Joe Garvin, Feras Abushakra, Zachary Choffin, Bayley Shiver, Yu Gan, Lingyan Kong, Nathan Jeong
Summary: This paper proposes a novel microwave imaging system for detecting the ripeness of watermelon as a proof of concept. The design utilizes a circular array with 10 Coplanar Vivaldi antennas offering wide bandwidth, high gain, and high efficiency. S-parameters between antennas are quickly collected via automated channel switching for fast image generation. Comparisons with sample cross-sections show distinct differences in image characteristics based on watermelon maturity. Sugar concentration of unripe and ripe watermelon is also measured and plotted for further validation of the imaging technique.
CURRENT RESEARCH IN FOOD SCIENCE
(2023)
Article
Medicine, General & Internal
Eleonora Razzicchia, Pan Lu, Wei Guo, Olympia Karadima, Ioannis Sotiriou, Navid Ghavami, Efthymios Kallos, George Palikaras, Panagiotis Kosmas
Summary: This study explores the feasibility of enhancing microwave imaging (MWI) for stroke detection using metasurface (MTS) loaded antennas. Experimental measurements and detailed simulation studies demonstrate that the MTS loading improves the performance of the imaging prototype, leading to more accurate reconstructions.
Article
Computer Science, Information Systems
Mohamad Yafik Ihtisyam Yazid, Mohd Hafiz Baharuddin, Mohammad Shahidul Islam, Mohammad Tariqul Islam, Ali F. Almutairi
Summary: This paper presents the development of an antipodal Vivaldi antenna with a fractal slot, which has potential applications in multisensory systems for head stroke imaging. The fractal slot is utilized to enhance the antenna's directivity, bandwidth, and gain. The research aims to design and optimize a compact Vivaldi antenna with the fractal slot for detecting stroke in the human head. The proposed antenna achieves a wide bandwidth of 1.44 GHz (2.35 GHz to 3.79 GHz) and a maximum gain of 7.35 dBi, and it meets the requirements for microwave imaging procedures.
Article
Engineering, Electrical & Electronic
Martina Teresa Bevacqua, Roberta Palmeri, Tommaso Isernia, Lorenzo Crocco
Summary: This article presents a general and simple procedure for designing VEs capable of enforcing contrast sources with desired properties. The proposed procedure is computationally straightforward and stable, as it does not require an explicit inversion and regularization process. The design approach is tested in the case of VE enforcing circularly symmetric contrast sources, and the corresponding inversion procedure is assessed using both simulated and experimental data.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Chemistry, Analytical
Jiwan Ghimire, Feyisa Debo Diba, Ji-Hoon Kim, Dong-You Choi
Summary: This paper presents a novel feed system for compact, wideband, high gain six-slot Vivaldi antenna arrays on a single substrate layer, utilizing a unique combination of power splitters, phase shifters, and T-branches. The proposed antenna system ensures symmetrical beam patterns without splitting, leading to highly directive radiation patterns. The design features a T-junction power splitter with an out-of-phase feeding mechanism and a T-branching feeding, contributing to high realized gain and front-to-back ratio.
Article
Engineering, Biomedical
Mingyang Ren, Zhongwen Cheng, Linghua Wu, Huimin Zhang, Shanxiang Zhang, Xiaoyu Chen, Da Xing, Huan Qin
Summary: This paper presents the design and evaluation of a portable microwave-acoustic coaxial TA probe that can flexibly image the region of interest. By adjusting the geometry of the antennas and the ultrasonic transducer, the probe achieves homogeneous microwave illumination and high-sensitivity ultrasonic detection. Experimental results demonstrate that the proposed probe successfully visualizes the anatomical structure of breast tumors with high resolution and excellent signal-to-noise ratio.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Pan Lu, Juan Corcoles, Panagiotis Kosmas
Summary: The study introduces a novel matrix building technique utilizing basis functions of the finite element method in a 2-D DBIM algorithm, showcasing efficiency in solving the electromagnetic inverse scattering problem for microwave imaging.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Physics, Mathematical
Yunwen Yin, Weishi Yin, Pinchao Meng, Hongyu Liu
Summary: This paper proposes a hybrid approach that combines linear sampling method and Bayesian method to simultaneously reconstruct multiple obstacles. Numerical experiments are provided to testify the effectiveness and efficiency of the proposed method.
COMMUNICATIONS IN COMPUTATIONAL PHYSICS
(2022)
Article
Geochemistry & Geophysics
Mehmet Nuri Akinci
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2018)
Article
Geochemistry & Geophysics
Ismail Kurtoglu, Mehmet Cayoren, Ismail Hakki Cavdar
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2019)
Article
Engineering, Biomedical
Mehmet Nuri Akinci, Mehmet Cayoren, Ersin Gose
PHYSICS IN MEDICINE AND BIOLOGY
(2019)
Article
Biology
Banu Sacli, Cemanur Aydmalp, Gokhan Cansiz, Sulayman Joof, Tuba Yilmaz, Mehmet Cayoren, Bulent Onal, Ibrahim Akduman
COMPUTERS IN BIOLOGY AND MEDICINE
(2019)
Article
Engineering, Electrical & Electronic
Tuba Yilmaz, Banu Sacli, Gokhan Cansiz, Sulayman Joof, Cemanur Aydinalp, Mehmet Cayoren, Ibrahim Akduman, Bulent Onal
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2019)
Article
Engineering, Electrical & Electronic
Semih Dogu, Mehmet Nuri Akinci, Mehmet Cayoren, Ibrahim Akduman
IET MICROWAVES ANTENNAS & PROPAGATION
(2020)
Article
Radiology, Nuclear Medicine & Medical Imaging
Sema Cosgun, Egemen Bilgin, Mehmet cayoren
Article
Medicine, General & Internal
Aleksandar Janjic, Mehmet Cayoren, Ibrahim Akduman, Tuba Yilmaz, Emre Onemli, Onur Bugdayci, Mustafa Erkin Aribal
Summary: SAFE is a novel microwave imaging device for breast cancer screening and early detection, using harmless electromagnetic waves without the need for X-rays. Initial results show promising concordance with clinical reports, encouraging further studies on its effectiveness. Breast size was found to influence sensitivity rates, with smaller breasts having lower sensitivity compared to larger ones.
Article
Engineering, Mechanical
Hadi Alidoustaghdam, Mehmet Cayoren
Summary: This study investigates multiphase flow monitoring inside metallic pipes using qualitative microwave imaging to detect foreign objects and eliminate contamination. By employing the factorization method of qualitative inverse scattering theory, real-time flow monitoring is achieved, showing promising capabilities in detecting foreign objects in industrial flows such as food and petroleum.
FLOW MEASUREMENT AND INSTRUMENTATION
(2021)
Article
Engineering, Electrical & Electronic
Sema Cosgun, Egemen Bilgin, Mehmet Cayoren
Summary: A new method is presented in this paper to determine the complex dielectric permittivity profile of three-dimensional inhomogeneous dielectric objects. By measuring the scattered electric field vectors in the frequency domain, the method can be used to reconstruct scatterers with complex shapes.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Ismail Dilman, Mehmet Nuri Akinci, Tuba Yilmaz, Mehmet Cayoren, Ibrahim Akduman
Summary: This work presents a new method for measuring the complex dielectric permittivity variation of materials using open-ended coaxial probes. The method directly retrieves the Debye model parameters without the need for data fitting. Experimental verification shows that the method achieves high accuracy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Electrical & Electronic
Sulayman Joof, Cemanur Aydinalp, Ismail Dilman, Mehmet Nuri Akinci, Tuba Yilmaz, Mehmet Cayoren, Ibrahim Akduman
Summary: In this study, a general guideline and technique for retrieving complex permittivities of materials using a deep learning model are proposed. The technique utilizes synthetic data generated from an admittance model and a four-pole Cole-Cole relaxation model, and is able to accurately predict the complex permittivities of biological tissues. The results show that the technique has a high prediction accuracy when compared with real measured data.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Aleksandar Janjic, Tuba Yilmaz, Mehmet Cayoren, Ibrahim Akduman, Lorenzo Crocco
2020 14TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP 2020)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Hadi Alidoustaghdam, Mehmet Cayoren
PROCEEDINGS OF THE 2020 GERMAN MICROWAVE CONFERENCE (GEMIC)
(2020)