Article
Engineering, Electrical & Electronic
Dingzhao Chen, Yanhui Liu, Shu-Lin Chen, Pei-Yuan Qin, Y. Jay Guo
Summary: A wideband low-profile antenna with switchable multilinear polarizations is proposed in this study, utilizing odd number dipoles with trapezoidal-shaped arms and p-i-n diodes for polarization reconfiguration. A circular-contoured artificial magnetic conductor (AMC) reflector is used to reduce antenna profile, while maintaining almost rotationally invariant performance. Multiple dipole structures with different LP configurations are studied, achieving measured overlapped bandwidths and peak gains within a specified frequency range.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Ren-Hui Jin, Zheng-Gang Yan, Ya-Wen Liu, Wen-Zhong Lu, Xiao-Chuan Wang
Summary: A wideband function reconfigurable metamaterial (FRM) is proposed for radar cross section (RCS) reduction, which can switch between absorption and cancellation modes by regulating the circuit unit. The experimental results demonstrate significant RCS reduction in both absorption and cancellation functions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Ryuji Kuse, Takeshi Fukusako, Akira Matsushima
Summary: This study presents a technique to compensate for the difference in reflection phase characteristics between a finite-size metasurface (MS) and an infinite MS structure. A new MS design with notches and slots on the backing conductor is proposed to compensate for the reflection phase affected by complex diffraction at the edge. The fabrication and analysis of both the proposed and conventional MSs show that the proposed design effectively achieves the desired performance based on the unit cell analysis corresponding to the infinite structure.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Information Systems
Sherif A. A. Khaleel, Ehab K. I. Hamad, Naser Ojaroudi Parchin, Mohamed B. B. Saleh
Summary: This article proposes a graphene-based antenna structure that can modernize applications and meet user demands in the upcoming 6G communication network. The antenna has a reconfigurable and controllable surface, allowing for beam steering and gain enhancement. By manipulating the graphene material, the antenna can achieve directional transmission and improve signal strength.
Article
Engineering, Multidisciplinary
Wen-Jing Wu, Gaofeng Wang
Summary: The paper proposes a modified artificial magnetic conductor (M-AMC)-based antenna sensor for retrieving the complex permittivity of the material under test (MUT). The sensor system consists of a coplanar waveguide (CPW) antenna and a M-AMC structure. The M-AMC structure is composed of a 3 x 3 array and each unit cell is fabricated by two-layer dielectric substrates. The proposed antenna sensor achieves an average sensitivity of 1.89% and a maximum error of less than 3.516% in extracting the real permittivity.
Article
Engineering, Electrical & Electronic
Zhiyuan Liu, Yikai Chen, Shiwen Yang
Summary: The Vivaldi antenna array is well-suited for phased array developments in airborne installations due to its wide bandwidth and scanning angle. However, its usage is limited by the 3-D structure, which can result in significant electromagnetic scattering and compromise the stealth property of the airborne platform. This work proposes two techniques to reduce in-band scattering of the Vivaldi antenna arrays, achieving a balance between scattering reduction and radiation performance.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Chemistry, Analytical
Musa N. Hamza, Yadgar Abdulkarim, Salah Raza Saeed, Olcay Altintas, Rashad H. Mahmud, Bhargav Appasani, Cristian Ravariu
Summary: This research presents a new low-cost microstrip patch antenna suitable for wideband microwave imaging applications. The antenna performance is improved with the addition of an artificial magnetic conductor (AMC), which is validated through experimental results. This work is of significant importance for the design of electromagnetic biosensors.
Article
Engineering, Electrical & Electronic
Hang Yuan, Fu-Chang Chen
Summary: This paper investigates a mixed decoupling scheme for a dual-polarized antenna array. The array considered here is a 2-1-2 staggered scheme for the base station, with both non-negligible E- and H-plane coupling between antenna elements. To suppress mutual coupling, a novel decoupling scheme is proposed, combining an artificial magnetic conductor (AMC) and an array-antenna decoupling surface (ADS). The proposed scheme effectively reduces the antenna profile, suppresses E-plane coupling, and achieves improved isolation and performance.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Information Systems
Lina Qiu, Gaobiao Xiao
Summary: A broadband circularly polarized antenna with enhanced gain and low profile is proposed, featuring crossed-dipoles with full wavelength as the main radiators and an artificial magnetic conductor (AMC) structure as the reflector. The antenna design successfully reduces the profile while achieving a wide impedance bandwidth and axial ratio bandwidth, as well as high peak and average gain.
Article
Chemistry, Analytical
Guang Lu, Fabao Yan, Kaiyuan Zhang, Yunpeng Zhao, Lei Zhang, Ziqian Shang, Chao Diao, Xiachen Zhou
Summary: This paper presents dual-band high-gain subwavelength cavity antennas with artificial magnetic conductor (AMC) metamaterial microstructures. A cavity antenna was constructed using a dual-band AMC metamaterial plate and a feed patch antenna as the radiation source. The antenna demonstrated low profile, light weight, dual-frequency capability, high gain, and easy processing.
Article
Engineering, Electrical & Electronic
Changfei Zhou, Jiaxing Sun, Wen-Wen Yang, Min Li, Hang Wong
Summary: The fusion of dipole and patch antennas is proposed to achieve a wide band and a low profile by loading parasitic elements. A double-layer-metal artificial magnetic conductor (AMC) is employed to reduce the height, and two shorting pins are loaded to improve the isolation. The measured results show that the proposed antenna has a wide impedance bandwidth, high isolation, and stable performance.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Hossein Malekpoor, Ali Abolmasoumi
Summary: This article introduces a low-profile eight-element printed dipole antenna (PDA) array with a broadband rhomboid artificial magnetic conductor (AMC) for wireless communication systems. The PDA array loaded with an AMC reflector achieves a low-profile wideband structure with enhanced radiation properties. The measured parameters demonstrate a broad bandwidth and suitable isolation for MIMO systems. The suggested PDA with the AMC exhibits a smaller size, enhanced gain, excellent impedance matching, and directional radiation patterns compared to the PDA without the AMC.
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Rawaa Maher, Ahmed Allam, Haruichi Kanaya, Adel B. Abdelrahman
Summary: This paper presents two high-gain, dualband antennas designed to harvest energy from GSM-1800 and the 2.45 GHz ISM frequency bands. The antennas demonstrate good gain and circular polarization characteristics. Additionally, a dualband rectifier is designed to achieve high peak conversion efficiency.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Computer Science, Information Systems
Muhammad Aamer Shahzad, Kashif Nisar Paracha, Salman Naseer, Sarosh Ahmad, Muhammad Malik, Muhammad Farhan, Adnan Ghaffar, Mousa Hussien, Abu Bakar Sharif
Summary: The study introduced an antenna integrated on a smart watch strap, which achieved high gain and efficiency through the use of flexible antenna design and optimized antenna unit, with low specific absorption rate near the human body, suitable for wireless IoT applications.
Article
Computer Science, Information Systems
Hossein Malekpoor, Ali Abolmasoumi
Summary: This article introduces a low-profile 16-element printed dipole antenna (PDA) array supported by a broadband Giuseppe Peano artificial magnetic conductor (AMC) for wireless communication systems. By inserting the AMC reflector into the PDA, improved radiation efficiency and a wider bandwidth are achieved, with a measured bandwidth of 4.50-7.20 GHz for WLAN/WiMAX and 5G applications.
Article
Engineering, Electrical & Electronic
Huangyan Li, Shi Chen, Filippo Costa, Yi Wang, Qunsheng Cao, Wen Wu, Agostino Monorchio
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Tao Liang, Sami Barmada, Nunzia Fontana, Yan-zhao Xie, Danilo Brizi, Agostino Monorchio
Summary: The use of magnetic metasurfaces in Wireless Power Transfer systems is a popular research topic that has been proven to increase power transfer performance and improve EMC properties. In this study, the susceptibility of these systems to Electromagnetic Interference (EMI) is investigated, and different parameters for selected system components are evaluated. The worst-case scenarios for voltage peak, energy, and sharpness at transmitting and receiving ports and each capacitor of the metasurface are calculated. The results show that the metasurface may not necessarily reduce susceptibility to EMI and can be the most critical component itself. Identification of key parameters provides insights into the proper design of metamaterials used as shielding devices.
INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS
(2023)
Article
Multidisciplinary Sciences
Valeria Lazzoni, Danilo Brizi, Agostino Monorchio
Summary: In this paper, the design of spatial filtering magnetic metasurfaces for improving the efficiency of misaligned wireless power transfer (WPT) systems is presented. An analytical framework is developed to control the currents and manipulate the spatial magnetic field distribution on a finite-size metasurface. Numerical simulations and experimental measurements on fabricated prototypes validate the proposed approach, which is particularly helpful for WPT applications with frequently changing coil positions.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Angelica Masi, Danilo Brizi, Agostino Monorchio
Summary: This article presents the design and fabrication of a microwave contactless sensor for detecting millimetric inclusions in a biological medium. The sensor configuration consists of a self-resonant planar spiral resonator (SR) inductively coupled to an external concentric single-loop probe, operating at 648 MHz. The detection is achieved by measuring both the amplitude variation and frequency shift of the input impedance of the reading probe. Full-wave simulations and experimental verification demonstrate the effectiveness of the sensor in detecting air bubbles in hemodialysis procedures and highlight its potential use in biomedical applications.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Danilo Brizi, Maria Conte, Agostino Monorchio
Summary: In this article, a new antenna utilizing specially designed metasurfaces is introduced to improve radiating performance near the human body in microwave biomedical applications. Design guidelines are presented to realize a thin metasurface acting as an impedance matching layer between the radiating element and biological tissue. Additionally, an artificial magnetic conductor (AMC) is combined as the backing element of the antenna for the first time to improve gain and reduce undesired back radiation.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Multidisciplinary Sciences
Martina Falchi, Sabrina Rotundo, Danilo Brizi, Agostino Monorchio
Summary: This paper presents a novel low-frequency sensing solution using a passive holographic magnetic metasurface, controlled by an active RF coil. The sensing capability is based on the interaction between the magnetic field distribution produced by the radiating system and the magneto-dielectric inhomogeneities in the material under test. The proposed approach shows effectiveness in non-destructive sensing of inhomogeneities with magnetic inclusions in a medium, even at extremely low frequencies.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Eliana Canicatti, Danilo Brizi, Angelica Masi, Nunzia Fontana, Agostino Monorchio
Summary: This study compares the electromagnetic exposure of representative human models with different body features and genders when exposed to near-field, high-power, and broadband devices. The results show that the WBA-SAR is mainly related to the total body weight, while the 10-g SAR varies along with the frequency range. Guidelines for exposure reduction and physical considerations are also presented.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Medicine, General & Internal
Eliana Canicatti, Daniel Alvarez Sanchez-Bayuela, Cristina Romero Castellano, Paul Martin Aguilar Angulo, Ruben Giovanetti Gonzalez, Lina Marcela Hernandez, Juan Ruiz Martin, Gianluigi Tiberi, Agostino Monorchio
Summary: Custom-designed electromagnetic characterization system based on an open-ended coaxial probe was used to discriminate between benign and malignant breast tissues in a clinical setting. The dielectric properties of the breast tissues were reconstructed immediately after biopsy, enabling tissue discrimination based on a rule-of-thumb. Statistical evaluation of the system's performance showed good sensitivity, specificity, and accuracy compared to conventional histological assessment.
Article
Engineering, Electrical & Electronic
Sabrina Rotundo, Danilo Brizi, Agostino Monorchio
Summary: This article presents the theoretical and experimental feasibility analyses of a high-sensitivity imaging system for non-invasive detection of pathological inclusions within biological tissues. The system utilizes a low frequency magnetic field to produce a focused magnetic field distribution, allowing for high-sensitivity imaging and detection of inclusions with sizes in the order of 1 cm. The effectiveness of the system is evaluated through full-wave numerical simulations and experimental measurements, demonstrating its potential for non-invasive detection of malignant inclusions.
IEEE JOURNAL OF ELECTROMAGNETICS RF AND MICROWAVES IN MEDICINE AND BIOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
S. Rotundo, V. Lazzoni, D. Brizi, A. Monorchio
Summary: This paper presents a preliminary analysis of a near-field radiating system for biomedical sensing applications using a radio-frequency magnetic field. The system, operating at 50 MHz, consists of a resonant helical coil wrapped around a ferromagnetic core and is inductively coupled with an unloaded probe loop. The system design aims to produce a focused magnetic field distribution and improve the device detection sensitivity by introducing a ferromagnetic material. The proposed non-invasive system has the advantages of low-complexity instrumentation and reduced health risks compared to current diagnostic techniques such as X-rays. Preliminary numerical results suggest the feasibility of an innovative near-field clinical device for non-invasive sensing applications, such as malignant tumor detection.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Daniel Alvarez Sanchez-Bayuela, Eliana Canicatti, Mario Badia, Lorenzo Sani, Lorenzo Papini, Cristina Romero Castellano, Paul Martin Aguilar Angulo, Ruben Giovanetti Gonzalez, Lina Marcela Cruz Hernandez, Juan Ruiz Martin, Navid Ghavami, Gianluigi Tiberi, Agostino Monorchio
Summary: In recent years, new technologies based on dielectric principles have been developed for medical applications. Variations in conductivity and permittivity of biological tissues have been identified between benign and malignant tissues, leading to efforts in implementing low-power microwaves for medical imaging. This study presents the application of Machine Learning approaches to dielectric data from excised breast tissues, offering new tools for optimizing hospital routines in diagnosis.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Valeria Lazzoni, Riccardo Rossi, Danilo Brizi, Francesca Ugolini, Silvia Baronti, Marco Moriondo, Marco Bindi, Agostino Monorchio
Summary: This paper presents preliminary results of a measurement campaign for a novel sensor designed for monitoring plants' hydric stress. The proposed sensor is a microwave sensing system that operates at around 250 MHz, employing a microstrip self-resonant spiral coil coupled to an external concentric planar probe loop. The experimental results demonstrate that as the irrigation water decreases, there is an increase in the resonant frequency of the spiral coil and the input impedance amplitude of the probe loop. These findings encourage further research, particularly in the field of precision agriculture.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Angelica Masi, Danilo Brizi, Agostino Monorchio
Summary: Intelligent dressings are being used to monitor and treat inflammatory processes in wound healing. A low-cost and reusable sensor has been developed to integrate into dressing bandages for this purpose. The sensor utilizes a radiating system with a planar metasurface made of passive spiral resonator unit cells to analyze the impedance of the tissue and identify the presence and location of inflammation. This sensor shows great promise in improving treatment decisions and monitoring tissue health status.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Article
Engineering, Electrical & Electronic
Paris Velez, Ferran Paredes, Pau Casacuberta, Mahmoud Elgeziry, Lijuan Su, Jonathan Munoz-Enano, Filippo Costa, Simone Genovesi, Ferran Martin
Summary: This article presents a low-cost and portable phase-variation planar microwave sensor operating in reflective mode, which retrieves the phase of the reflection coefficient of the one-port sensing element using a distributed circuit based on a pair of rat-race hybrid couplers and associated electronics. This architecture can be adapted to other one-port reflective-mode phase-variation microwave sensors.
IEEE SENSORS JOURNAL
(2023)
