Article
Materials Science, Ceramics
Hafiz Shehbaz Ahmad, Tanveer Hussain, Yasir Nawab, Shuaib Salamat
Summary: In this study, carbon fiber reinforced unidirectional composite (CFRC) structures were developed by adding various dielectric and magnetic nanofillers at a 2% loading concentration of the weight of the matrix. The microwave absorption properties were investigated in a wide frequency range, and it was found that the absorption increased with frequency, with the maximum value observed in the X frequency range (8.2-12.4 GHz)。
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Jiabin Chen, Xiaohui Liang, Jing Zheng, Weihua Gu, Chunchuan Pei, Feiyue Fan, Guangbin Ji
Summary: Mesoporous carbon fibers, as a lightweight microwave absorbing material, exhibit excellent microwave absorbing properties attributed to outstanding dipole polarization. Modulating permittivity by adjusting the pore structure, along with computer simulation technology (CST) validation, enables significant radar cross section (RCS) reduction performance for designing excellent microwave absorbing materials.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Engineering, Electrical & Electronic
Amir Zahedi, Farhad Akbari Boroumand, Hadi Aliakbarian
Summary: This study presents a novel method using a cross-resonator for complex permittivity measurement, offering high accuracy with a relative error less than 1% over the frequency range. The symmetrical structure eliminates unwanted asymmetric modes and allows for direct extraction of the propagation constant from S-parameters.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Materials Science, Composites
Yuksel Akinay, Bektas Colak, Muhammet Emre Turan, Ihsan Nuri Akkus, Hilal Celik Kazici, Abdullah Oguz Kizilcay
Summary: The study investigated the electromagnetic wave absorption properties of glass fiber/epoxy composite materials filled with nanoparticles doped mica pigments, showing that Sb2O3:SnO2/mica particles exhibit superior absorption performance. This composite material has potential applications as an electromagnetic wave absorber due to its high complex permittivity and low reflection loss values.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Physical
K. S. Ashraff Ali, M. M. Ravikumar, J. Mohammed, Naeim Farouk, V. Mohanavel, M. Ravichandran
Summary: This study reported the microwave absorption properties of BaFe12O19, carbon fiber@Fe3O4 composite, and graphene@BaFe12O19@Fe3O4 composite, and their effects on the microwave absorption performance. Increasing filler loading in different combinations can enhance microwave absorption capabilities within a certain range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Kai-Daniel Jenkel, Jesus Sanchez-Pastor, Mohammad Mahdi Baloochian, Rolf Jakoby, Masoud Sakaki, Alejandro Jimenez-Saez, Niels Benson
Summary: This contribution discusses the impact of sintering temperatures on the dielectric properties of 3D-printed alumina in the W-band. By varying the sintering temperature, the relative permittivity of the alumina could be tuned while the dielectric losses remained moderate. The study demonstrates the feasibility and material tunability of LCM technology in mm- and sub-mm-wave applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Environmental Sciences
Mira Kaissar Abboud, Ali Khenchaf, Philippe Pouliguen, Thomas Bonnafont
Summary: Computing the Radar Cross-Section (RCS) is crucial for various applications such as target detection and stealth technology. This article presents a Gaussian Beam Summation (GBS) method for metallic and dielectric targets, which computes the scattering far fields generated by equivalent currents. The efficacy of this method is verified in the X-band through comparison with other accurate techniques like ray tracing and ray asymptotic solution. Additionally, the accuracy of the GBS method is demonstrated by obtaining wave fields and RCS of dielectric cuboids.
Article
Chemistry, Physical
Shivanshu Goel, Avesh Garg, Himangshu Bhusan Baskey, Mritunjay Kumar Pandey, Sachin Tyagi
Summary: The study investigated the effect of bio-waste derived activated carbon on the magnetic and dielectric properties of barium hexaferrite for microwave absorption application. The addition of activated carbon led to increased reflection loss and changes in dielectric and magnetic properties, impacting the microwave absorption properties of the composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Peng Wu, Wenting He, Hongbo Guo
Summary: A novel microwave absorbing material, sodium cobaltates (Na0.78CoO2), with a lamellar structure, was synthesized and showed good electromagnetic attenuate property. The composite with 50 wt% Na0.78CoO2 and 50 wt% paraffin achieved a minimum reflection loss (RL) of around -51.7 dB at a frequency of 8.2 GHz when the thickness was about 2.41 mm. Its effective absorbing bandwidths (RL <-10 dB) were in the range of 12.5 to 15.6 GHz for a sample thickness of around 1.5 mm. The electromagnetic attenuation mechanisms of the composite were related to conductive loss, multiple reflection loss, and dipole or interfacial polarization loss.
CERAMICS INTERNATIONAL
(2022)
Article
Environmental Sciences
Xu Li, Shengbo Ye, Qingyang Kong, Chenyang Song, Xiaojun Liu, Guangyou Fang
Summary: This paper proposes a full-wave inversion real-time permittivity estimation method for stepped-frequency GPR, which improves the accuracy and efficiency of permittivity estimation by introducing a layered media detection model and optimizing waveform compensation.
Article
Environmental Sciences
Freya Addison, Thomas Dally, Elizabeth J. Duncan, James Rouse, William L. Evans, Christopher Hassall, Ryan R. Neely
Summary: In this study, electromagnetic modelling was used to investigate the radar cross section (RCS) of a volant animal. High-resolution modelling of insects was found to have advantages over previous ellipsoidal models, and the composition of wings and separation of body, wings, legs, and antennae were found to impact the RCS of the specimen.
Article
Materials Science, Ceramics
Meenu Chahar, Samiksha Dabas, O. P. Thakur
Summary: This study synthesized nano-composites of Ni0.5Zn0.5Fe2O4/MWCNTs and investigated their properties using various analytical techniques. The synthesized materials exhibited crystalline phase formation and a hexagonal flake-like structure. The electromagnetic interference performance of the materials was tested using a Vector Network Analyzer, and the CM nano-composite showed excellent shielding effectiveness.
CERAMICS INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Shaoyang Kong, Cheng Hu, Rui Wang, Fan Zhang, Lianjun Wang, Teng Long, Kongming Wu
Summary: In this study, a multiband polarimetric radar cross section measurement system was established to measure and analyze the RCS of 169 insects belonging to 21 species. The results systematically presented the scattering characteristics and variations of insects at different frequencies, verifying the effectiveness and accuracy of the established system.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2021)
Article
Engineering, Electrical & Electronic
Yin Jeh Ngui, Chih-Ping Lin
Summary: An innovative self-referencing time-domain reflectometry (TDR) dielectric spectroscopy method is introduced. The method extracts reflections from a mismatched section (MS) to characterize complex dielectric permittivity (CDP) in the sensing section (SS) using reflection-decoupled analysis (RDA). The method offers a cost-effective and flexible approach compared to traditional frequency-domain methods.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Chemistry, Applied
Sanja Martinez, Ivana Soic, Vedrana Spada
Summary: The equivalent circuit Re(Q(1)[R-1(Q(2)R(2))]) was used to analyze the performance of industrial coating systems under long-term exposure to 3.5% NaCl. The sensitivity of coatings to environmental conditions correlated with the exposure conditions, and the adhesion test and cathodic offset potential could evaluate the barrier properties of the coatings.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Computer Science, Interdisciplinary Applications
Shubhadip Paul, Mohammad Jaleel Akhtar
Summary: A novel near field subsurface microwave imaging scheme is proposed by integrating a high gain planar metasurface loaded slot antenna with the SAR algorithm. The antenna structure, utilizing the EVL MS, shows significantly enhanced gain and efficiency, enabling microwave imaging of metallic and dielectric targets with subwavelength spatial resolution. The research demonstrates the applicability of the proposed low-profile MS loaded antenna for near field subsurface microwave imaging in free space and lossy media.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Vikesh S. Bhadouria, Zubair Akhter, M. Jaleel Akhtar, P. Munshi
Summary: An innovative automated microwave technique has been proposed for monitoring hidden objects by integrating time-domain method and automated scanning setup to obtain the dielectric profile. The technique can provide 2D microwave images and approximate size of concealed objects in standard sand or behind concrete structures, making it useful for through-the-wall imaging and landmine detection.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Aman Verma, Surabhi Jain, Nilesh Kumar Tiwari, M. Jaleel Akhtar
Summary: This paper presents a novel miniaturized noninvasive submersible compact planar sensor for estimating petroleum contents. The sensor, based on a microstrip technique, operates at a resonating frequency of 8.87 GHz with high sensitivity and accurate detection capability for different levels of petroleum contents in soil samples. The sensor also utilizes an innovative automated neural network-based algorithm for permittivity extraction and shows good repeatability in detecting materials contents, making it suitable for applications in transportation pipelines and mining exploration.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Instruments & Instrumentation
Sachin Seth, Apala Banerjee, Nilesh K. Tiwari, M. Jaleel Akhtar
Summary: A tunable automated standalone RF sensor system based on ANN is proposed, achieving a higher tuning range with a modified design configuration. The ANN is trained using S-parameters of various dielectric samples as a training dataset, providing reasonably accurate results for the extracted complex permittivity.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Engineering, Electrical & Electronic
Ankita Kumari, Surya P. Singh, Nilesh K. Tiwari, M. Jaleel Akhtar
Summary: A new design of highly confined Spoof Surface Plasmon (SSP) line splitter-based differential phase sensor is presented for the THz frequency region, achieving highly confined and compact design. The designed differential splitter improves the dispersion characteristic of stem shaped unit cell, providing a symmetric differential sensing environment. The proposed sensor shows high sensitivity due to improved electric field confinement, with substantial phase difference observed even with small defects.
IEEE SENSORS JOURNAL
(2022)
Article
Computer Science, Interdisciplinary Applications
Surabhi Jain, Nilesh K. Tiwari, M. Jaleel Akhtar
Summary: The study presents a SIW-based RF sensor design for assessing milk quality, involving preparation of milk adulterants and collection of pure milk samples. A systematic approach is used to analyze deviations in milk quality using RF sensing mechanism. Mathematical processing of S-parameters shift and dielectric property estimation of test samples are conducted to visualize quantitative RF attributes.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Jutika Devi, M. Jaleel Akhtar, Pranayee Datta
Summary: In this experiment, we successfully demonstrated a microwave filter based on cadmium sulfide/zinc sulfide core-shell nanoparticles using a planar microstrip filter design. The complex permittivity profile showed that the nonlinear dielectric switching was reversible and stable for all cycles corresponding to second-order phase transition. The filter functioned accurately across a wide frequency range, as confirmed by the return loss, transmission loss, and phase shift response. The filter design was validated by the generation of a notch at 11.85 GHz with a rejection level of -50.14 dB and a transmission dip induced by Mie resonance. Additionally, a phase shift of 178.19 degrees at 9.51 GHz confirmed the generation of the microwave notch. The compact and structurally simple notch filter has the potential for wide frequency tuning and sharp notch generation, making it suitable for microwave photonic filter applications in biomedical systems.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Sandeep Kumar Singh, Yaswanth K. Penke, J. Ramkumar, M. J. Akhtar, Kamal K. Kar
Summary: This work focuses on the synthesis and application of Al substituted copper ferrite infused reduced graphene oxide (rGO) as a microwave absorbing material. The results show that infusing Al substituted copper ferrite into rGO enhances the absorption capacity. The fabricated CAF-rGO/epoxy nanocomposite exhibits excellent microwave absorption performance under low filler content and small matching thickness conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Jitendra Tahalyani, M. Jaleel Akhtar, Kamal K. Kar
Summary: This study focuses on the design and development of lightweight, flexible, and thin nanocomposite structures with enhanced electromagnetic interference (EMI) shielding. It was found that embedding 6 wt% graphene nanoplatelets (GNPs) in a polyurethane matrix provides excellent conductive and dielectric properties in the specified frequency band. Numerical simulation and mechanical bending tests confirm the high shielding effectiveness and reliability of the proposed flexible structure.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2022)
Article
Engineering, Electrical & Electronic
Shubhadip Paul, Nilesh Kumar Tiwari, Mohammad Jaleel Akhtar
Summary: In this study, a novel highly directive GRIN metasurface (MS) lens integrated dielectric-filled horn antenna (DFHA) for effective monitoring and detection of deep tumors inside the body is developed. Two novel GRIN MS lens topologies are proposed, both utilizing an optimized refractive index distribution. The proposed lens-based DFHA demonstrates enhanced signal penetration and spatial resolution, making it suitable for tumor detection deep inside the body.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Apala Banerjee, Prakrati Azad, M. Jaleel Akhtar
Summary: A novel RF sensor is developed and successfully utilized to determine the Sodium ion constituent variation in human body fluid, which is crucial for metabolic functioning. The measured sensitivity for Na+ ions in the body fluid is recorded to be 0.03 dB/(mmol/dm3) for the fabricated RF sensor.
IEEE JOURNAL OF ELECTROMAGNETICS RF AND MICROWAVES IN MEDICINE AND BIOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Shubhadip Paul, M. Jaleel Akhtar
Summary: In this article, a novel synthetic aperture radar (SAR) microwave imaging technique is proposed for detecting target objects inside layered media. The technique combines the standard Riccati equation-based reconstruction algorithm with the equivalent time domain approach to accurately estimate the electrical properties and thickness of individual layers. The major innovation lies in the integration of the proposed imaging scheme with the SAR algorithm, enabling accurate detection of targets buried deep within the layered media.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Apala Banerjee, Nilesh K. Tiwari, Farheen Fatima, M. Jaleel Akhtar
Summary: An improved planar microwave sensor is presented for assessing the quality of recycled cooking oils. The proposed sensor exhibits improved performance in detecting slight variations in electrical and chemical properties. The experiments show that recycled oils have higher acid values, indicating their adverse effects on human health.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Abhishek Kumar Jha, Nilesh Kumar Tiwari, M. Jaleel Akhtar
Summary: This article introduces a new technique for calculating the dielectric properties of arbitrary length materials. The technique differs from traditional methods by considering the depolarization effect and the impact of sinusoidal variation of the electric field on the results, enhancing accuracy and reliability.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Electrical & Electronic
Prashant Kumar Varshney, M. Jaleel Akhtar
Summary: An enhanced substrate integrated waveguide (SIW) cavity sensor operating under sub-6 GHz 5G band is proposed, suitable for accurate permittivity estimation of low-loss dielectric materials. The sensor, designed for the fundamental TE101 mode at 3 GHz, features a newly optimized external coupling topology, high unloaded quality factor, and high sensitivity. In addition to accurately differentiating between closely resembling dielectric constants, the sensor is also capable of determining low loss tangents, demonstrating its potential usability for designing high performance RF filters, oscillators, and other devices.
IEEE SENSORS JOURNAL
(2021)