Article
Materials Science, Ceramics
Min Yang, Yan Gao, Yong Zheng, Xuepeng Lu, Huimin Yang, Xiangyu Xu, Peng Wu
Summary: Ca1-xBaxMgSi2O6 ceramics were prepared through solid-state reaction sintering, and the effects of substituting Ba2+ for Ca2+, relative density, phase composition, crystal morphology, and microwave dielectric properties were studied. The results showed that a single phase was formed when x ≤ 0.2, while a second phase appeared at x = 0.4. The increase in Ba2+ substitution affected the microwave dielectric properties, with Qxf value first increasing and then decreasing, and epsilon(r) value continuously increasing. The z(f) value also slightly improved.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Sen He, Kangguo Wang, Xianjie Zhou, Sang Hu, Xiaowen Luan, Shicheng Zhou, Xi Wang, Xiuli Chen, Huanfu Zhou
Summary: In this study, a high-quality CSAT ceramic was prepared using the RS method, and its phase structure, surface morphology, packing fraction, and valence bond were systematically investigated. The ceramic exhibited exceptional microwave dielectric properties with a relative dielectric constant of 17.5, quality factor of 66700 GHz, and temperature coefficient of resonant frequency of -6.93 ppm/°C, highlighting the excellent suitability of the RS method for preparing CSAT ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Zi-Xuan He, Lu Lu, Jia-Min Wu, An-Nan Chen, Shuang Chen, Li-Jin Cheng, Shuai-Bin Hua, Chen-Hui Li, Chang-An Wang, Yu-Sheng Shi
Summary: ZTM microwave dielectric ceramics were prepared using digital light processing technology. The sintering temperature was found to have a significant impact on the phase composition, microstructure, and microwave dielectric properties of the ceramics. The ceramics sintered at 1450°C exhibited the best microwave dielectric properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Brian M. Moloney, Peter F. McAnena, Sami M. Abd Elwahab, Angie Fasoula, Luc Duchesne, Julio D. Gil Cano, Catherine Glynn, AnnaMarie O'Connell, Rachel Ennis, Aoife J. Lowery, Michael J. Kerin
Summary: This study evaluated the clinical application of a low-power electromagnetic wave microwave breast imaging (MBI) system. The results showed that the MBI system was able to detect and localize the majority of breast lesions, including benign lesions and breast cancer. Patients reported a positive experience with the system, and no device-related adverse events were recorded. This study suggests that the MBI system has the potential to serve as a noninvasive, non-ionizing, and painless adjunct to breast cancer diagnosis.
ACADEMIC RADIOLOGY
(2022)
Article
Chemistry, Physical
Fuyu Li, Yuanxun Li, Yang Luo, Jinping Zhang, Yongcheng Lu, Rui Peng, Tingting Tang, Qiye Wen
Summary: This article reports a novel Zn0.96Cu0.oMoO4 ceramic and its application in microwave imaging devices. The substitution behavior and microwave dielectric properties of the ceramic are systematically studied. The ceramic exhibits excellent microwave dielectric properties when sintered at 825 degrees C. A 40 x 40 microstructure array for static microwave imaging is designed based on this ceramic substrate. This work opens up the application of microwave dielectric ceramics in the imaging field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Dawei Wang, Lifeng Ding, Ben Heng, Haikui Zhu, Xifeng Ding, Zhefei Wang, Lixi Wang, Shiwo Ta, Qitu Zhang
Summary: (1-x)BaSi2O5-Ba3V2O8 (x = 0.05-0.25 mol) novel low-dielectric ceramics were successfully synthesized and investigated via a solid-state sintering process. The presence of BaSi2O5 and Ba3V2O8 phases without any other phases was confirmed. Particularly, 0.8BaSi2O5-0.2Ba3V2O8 ceramics exhibited excellent microwave dielectric properties, making it a promising candidate for 5G microwave applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xianqiang Chen, Binfeng Zhao, Naichao Chen, Jin Cheng, Mingzhao Dang, Feng Wang, Xinwei Xu, Hong Wang
Summary: Nano-sized CaF2 powders synthesized using a wet chemical method enable low-temperature sintering and superior microwave dielectric properties. The addition of LiF as a sintering aid further improves the microwave dielectric properties of CaF2 ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Chemical
Pengfei Zhao, Chenhui Liu, Chandrasekar Srinivasakannan, Libo Zhang, Fang Wang, Jiyun Gao
Summary: The dielectric properties and heating characteristics of stibnite concentrate and pure antimony compounds were evaluated, showing differences in performance during microwave heating. Based on XRD and SEM-EDS results, a theoretical basis for microwave selective roasting stibnite concentrate to produce antimony oxide powder was proposed.
Article
Materials Science, Ceramics
Yin Liu, Dongmei Zhu, Gangli Feng, Yuchang Qing, Wancheng Zhou
Summary: By introducing Ni, Ti, or Zr ions to substitute for Mn ions in CaMnO3, the complex permittivity match was enhanced, leading to significant improvements in microwave absorption properties, including a substantial increase in the minimum reflection loss value and expansion of the effective absorption bandwidth.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xiao-Qiang Song, Fang-Fang Zeng, Jia-Qing Yang, Chang-Zhi Yin, Jia-Min Wu, Yu-Sheng Shi, Wen-Zhong Lu, Wen Lei
Summary: A novel microwave dielectric ceramic based on a garnet-type compound was successfully prepared in this study, with improved microwave dielectric properties by increasing the Ti4+ content, making it suitable for manufacturing devices in millimeter-wave communication systems.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Crystallography
Guoguang Yao, Jiuyan Zhao, Ya Lu, Hongkai Liu, Cuijin Pei, Qian Ding, Miao Chen, Yaming Zhang, Ding Li, Fu Wang
Summary: Li3TiO3F oxyfluorides ceramics were fabricated using a solid-state reaction strategy, and their sintering behavior, microstructure, phase assemblages, and microwave dielectric performances were investigated. The main phase of Li3TiO3F with cubic structures accompanied by small amounts of the LiF or Li2TiO3 secondary phase was identified. The 750°C-sintered Li3TiO3F samples exhibited good microwave dielectric performances, with εr = 18, Qxf = 57300 GHz (at 9.2 GHz), and τf = -43.0 ppm/°C.
Article
Materials Science, Ceramics
Zhiyu Ma, Weijia Guo, Zhenxing Yue
Summary: TiO2 addition in BSNTA ceramics improves the dielectric constant and temperature coefficient of resonant frequency. Sintering in oxygen enhances the density, dielectric constant, and Q x f value due to the reduction in defect concentration. The research provides new insight into the impact of sintering atmosphere on the Q x f value of titanate ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Dengyong Zhang, Hua Hao, Yongsen Luo, Zhonghua Yao, Minghe Cao, Hanxing Liu
Summary: 0.2CT-0.8LST ceramics with orthogonal perovskite structure were fabricated by adding ZnO additives. The addition of ZnO improved the microwave dielectric properties of the ceramics. Increasing the dopant concentration led to lower dielectric constant and temperature co-efficient of resonance frequency, and higher Q x f values. Raman spectroscopy showed that narrower Raman scattering peaks corresponded to longer microwave energy propagation decay times and higher Q x f values. XPS analysis revealed that the addition of Zn2+ ions limited the reduction of Ti4+ cations.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Guohui Zhou, Dawei Wang, Hai-ou Zhu, Wenjie Bian, Huidong Gu, Haikui Zhu, Lixi Wang, Qitu Zhang, Shiwo Ta
Summary: An original (1-x)ZnTiNb2O8-xZn(0.17)Nb(0.33)Ti(0.5)O(2) composite ceramics were prepared using the solid-state method. The addition of Zn0.17Nb0.33Ti0.5O2 effectively adjusted the properties of the matrix and significantly improved the dielectric performance. However, the Q x f values decreased with increasing addition.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Guoguang Yao, Yang Li, Jiaxin Yan, Jingjing Tan, Cuijin Pei, Yanmin Jia, Le Li, Peng Liu
Summary: A new microwave dielectric ceramic, NaSr4V5O17, was successfully prepared with low firing temperature via traditional method. The ceramic sintered at 725°C exhibited good compatibility with Ag electrode and superior dielectric properties, making it a potential application for LTCC.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Biomedical
Bilal Amin, Atif Shahzad, Laura Farina, Eoin Parle, Laoise McNamara, Martin O'Halloran, Muhammad Adnan Elahi
MEDICAL ENGINEERING & PHYSICS
(2020)
Article
Chemistry, Analytical
Nuno P. Silva, Anna Bottiglieri, Raquel C. Conceicao, Martin O'Halloran, Laura Farina
Article
Chemistry, Analytical
Alessandra La Gioia, Martin O'Halloran, Emily Porter
Article
Medicine, General & Internal
Niko Istuk, Emily Porter, Declan O'Loughlin, Barry McDermott, Adam Santorelli, Soroush Abedi, Nadine Joachimowicz, Helene Roussel, Martin O'Halloran
Summary: Accurate knowledge of the dielectric properties of biological tissues, particularly the heart, is crucial for dosimetry studies and medical technologies. A recent study demonstrated significant variations in dielectric properties among different components of the heart, highlighting the importance of treating the heart as a heterogeneous organ. The results show more than 25% difference in dielectric properties between some parts of the heart, underscoring the need for detailed models for electromagnetic modeling.
Article
Chemistry, Multidisciplinary
Raquel Cervigon, Brian McGinley, Darren Craven, Martin Glavin, Edward Jones
Summary: This study investigates the effects of ECG signal compression on an entropy-based AF detection algorithm, demonstrating that compression ratios of up to 90 can be obtained while maintaining a detection accuracy of at least 0.9.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Analytical
Declan O'Loughlin, Muhammad Adnan Elahi, Benjamin R. Lavoie, Elise C. Fear, Martin O'Halloran
Summary: Microwave breast imaging has been increasingly used in clinical investigations, with radar-based algorithms reconstructing images for clinicians by estimating dielectric properties. Errors in dielectric properties estimation can affect image quality and tumor detection. Analyzing patient images for dielectric properties estimation can provide further insights for microwave breast imaging research.
Article
Engineering, Civil
Jibran A. Abbasi, Darragh Mullins, Nicolas Ringelstein, Patrice Reilhac, Edward Jones, Martin Glavin
Summary: This study uses eye tracking and gaze concentration to determine driver perception, showing that on the approach to roundabouts, some drivers often divert their gaze away from the direction of travel of the vehicle and take a significant amount of time to return their gaze towards the direction of travel.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Review
Engineering, Biomedical
Fergal Henry, Martin Glavin, Edward Jones
Summary: Cochlear implant technology restores hearing function for patients with sensory impairment, but challenges remain in noisy conditions. This paper reviews noise reduction algorithms in cochlear implants, discussing single- and multiple-channel classifications and the emerging interest in machine learning techniques. The review concludes by highlighting promising future research areas.
IEEE REVIEWS IN BIOMEDICAL ENGINEERING
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Hamza Benchakroun, Declan O'Loughlin, Niko Istuk, Martin O'Halloran, Alessandra La Gioia
Summary: This study evaluated the performance of different types of tetrapolar probes in characterizing the electrical properties of cardiac tissue. The planar probe was found to be the most accurate for measuring in reference liquid, but further design optimization is needed to improve contact with the tissue.
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Hamza Benchakroun, Martin O'Halloran, Declan O'Loughlin
Summary: Microwave breast imaging is undergoing clinical investigations globally, facing challenges in removing large skin reflections and rotational artefacts which may affect image quality and tumour detection. Further research on rotational artefact removal is deemed necessary based on numerical simulations indicating potential impairment to image quality and tumour detection.
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2021)
Review
Engineering, Civil
Shane Gilroy, Edward Jones, Martin Glavin
Summary: Accurate and consistent vulnerable road user detection is challenging for autonomous vehicles, with partial occlusion being a complex and challenging issue. This research reviews solutions for occlusion detection and handling in the automotive environment, including detection, reasoning, and strategies for handling occlusion in pedestrian, vehicle, and object detection applications. Remaining challenges to achieving the required level of object detection performance for safe autonomous driving are also discussed.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Grazia Cappiello, Margarethus M. Paulides, Tomas Drizdal, Declan O'Loughlin, Martin O'Halloran, Martin Glavin, Gerard van Rhoon, Edward Jones
IEEE JOURNAL OF ELECTROMAGNETICS RF AND MICROWAVES IN MEDICINE AND BIOLOGY
(2020)