Article
Engineering, Electrical & Electronic
Ruolei Xu, Zhi Ning Chen
Summary: The proposed metasurface lens array fed by a phased array offers a compact solution for beamsteering applications with reduced thickness and cost. Beamsteering is achieved in two steps, first by switching the main beam direction over a large angular step, and then fine tuning with a low-cost phased array. The antenna design achieves a wide coverage range with high gain and low profile compared to conventional arrays and single-aperture lenses.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Information Systems
Prapan Leekul, Bonny Mgawe, Twahir Kazema, Hoang Nam Dao, Phaophak Sirisuk, Monai Krairiksh
Summary: This paper presents a compact sensor system for estimating the dielectric properties of materials based on commercial, off-the-shelf modules. The sensor system uses microwave reflection measurement to determine the dielectric constant and conductivity of the material. The evaluation results show that the proposed sensor system is fully functional and accurate for monitoring variations in the dielectric properties of materials.
Article
Engineering, Electrical & Electronic
Seksan Jiarasuwan, Kosin Chamnongthai, Navapadol Kittiamornkul
Summary: The paper proposes a design method for a microwave-based moisture sensing system to continuously scan moisture in granular materials in arbitrarily shaped containers, achieving a more accurate estimation of moisture levels.
IEEE SENSORS JOURNAL
(2021)
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
Yifei Sun, Chenzhe Li, Baosheng Wang, Xiong Wang
Summary: MITAT and CTAT techniques can be used to detect foreign bodies in the human body, but traditional imaging algorithms require intensive measurements and are not cost-effective. The CTAT-FBD method, on the other hand, achieves successful detection of both hot and cold foreign bodies embedded in tissues at a low cost, showing promise for various diagnosis or sensing applications. A portable system based on this technique is also feasible.
IEEE SENSORS JOURNAL
(2021)
Article
Computer Science, Information Systems
Yuki Gao, Maryam Ravan, Reza K. Amineh
Summary: The use of non-metallic pipes and composite components is increasing rapidly in various industrial sectors, requiring new non-destructive testing techniques. Holographic microwave imaging technology can be used as an effective technique for inspecting non-metallic pipes, and antenna arrays are used to improve data acquisition speed.
Article
Computer Science, Information Systems
Salvador Moreno-Rodriguez, Miguel A. Balmaseda-Marquez, Javier Carmona-Murillo, Angel Palomares-Caballero
Summary: This article presents a 3-D printed Fresnel-lens antenna made of dielectric unit cells that are insensitive to polarization. The design allows for implementation in any azimuth orientation, simplifying the design process and providing robustness under different conditions. The prototype showed good agreement with the simulations, with a measured gain of 26.5 +/- 0.5 dBi and mean antenna efficiency of 79% from 55 GHz to 65 GHz.
Article
Engineering, Electrical & Electronic
Ferhad Kasem, Robert Winter, Rouhollah Feghhi, Karumudi Rambabu, Witold A. Krzymien
Summary: This study presents the design of a 64-QAM I/Q modulator based on load modulation. The modulator operates at 3 GHz and utilizes load modulation to generate waveform of the M-QAM constellation points. An optimization algorithm is used to determine the design parameters of the load modulator circuit. The hardware prototype is implemented using microstrip lines and a diode-based switching circuit. Measurements show good agreement with simulation results.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Chemistry, Multidisciplinary
Muhammad Hamza Bhatti, Muhammad Abdul Jabbar, Muhammad Atif Khan, Yehia Massoud
Summary: This article introduces a low-cost microwave sensor for oil adulteration detection and characterization of pure edible oil. The experimental results demonstrate that the sensor can detect 10% to 30% adulteration in olive oil, and it has high sensitivity and quality factor, which is consistent with simulated results.
APPLIED SCIENCES-BASEL
(2022)
Review
Chemistry, Analytical
Lulu Wang
Summary: Medical imaging techniques, including X-ray mammography, ultrasound, and magnetic resonance imaging, play a crucial role in the timely identification and monitoring of breast cancer. Microwave imaging has emerged as a promising technique for breast cancer detection due to its non-ionizing, non-invasive, and cost-effective nature. Recent advancements in microwave imaging and sensing techniques have opened up new possibilities for the early diagnosis and treatment of breast cancer.
Article
Chemistry, Analytical
Srijan Datta, Saptarshi Mukherjee, Xiaodong Shi, Mahmood Haq, Yiming Deng, Lalita Udpa, Edward Rothwell
Summary: This paper introduces the design and application of a metamaterial lens in microwave imaging and nondestructive evaluation. Experimental results demonstrate that the metamaterial lens combined with a microwave system can achieve high sensitivity detection of subwavelength defects.
Article
Engineering, Electrical & Electronic
Anna Pietrenko-Dabrowska, Slawomir Koziel
Summary: Geometry parameters of contemporary microwave passives need careful tuning in the final stages of design to ensure optimal performance. Traditional modeling methods are unable to quantify certain phenomena that may affect the operation and performance, so further refinement is required after initial designs using equivalent network models. Simulation-driven optimization methods are computationally demanding, thus efforts have been made to expedite these procedures. This study proposes a novel algorithm that combines multifidelity optimization frameworks and sparse sensitivity updating schemes to reduce the optimization cost while maintaining design quality.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Engineering, Electrical & Electronic
Sabin Kumar Karki, Juha Ala-Laurinaho, Ville Viikari
Summary: This article presents a low-profile, efficient, and scanloss-reduced integrated metal-lens antenna (IMLA). By tilting the radiation pattern of the feed and using asymmetrical dielectric pins, the scan loss of the IMLA is reduced, resulting in high radiation efficiency and gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Materials Science, Ceramics
Weichao Lou, Minmin Mao, Kaixin Song, Kuiwen Xu, Bing Liu, Wenjun Li, Bin Yang, Zeming Qi, Jianwei Zhao, Shikuan Sun, Huixin Lin, Yuanyun Hu, Di Zhou, Dawei Wang, Ian M. Reaney
Summary: This study adjusts the temperature coefficient of resonant frequency of Mg2Al4Si5O18 ceramics using 5.5 wt% TiO2, while maintaining low relative permittivity and good properties. A demonstrator antenna made from the adjusted material exhibits high gain and efficiency.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Fisheries
Nila Rekha Peter, Albin Sunny, Nishan Raja Raja, Nijan Josephraj, Hemanth Kumar, Ambasankar Kondusamy
Summary: Feed cost is a major expense in shrimp farming, and a portable solar dryer has been developed to efficiently dry shrimp feeds, reducing operational costs.
AQUACULTURE INTERNATIONAL
(2023)
Article
Engineering, Chemical
Dongyao Duan, Fangyan Ma, Liqing Zhao, Yuanyuan Yin, Yinghui Zheng, Xin Xu, Ying Sun, Yiwei Xue
Summary: This study monitored the moisture content changes in tea leaves during the hot air drying process and analyzed the significant factors affecting the drying effect. A dynamic prediction model using neural network algorithms was established, and the results showed that temperature, speed, and feeding rate had significant effects on the drying process.
JOURNAL OF FOOD PROCESS ENGINEERING
(2022)
Article
Food Science & Technology
Xin Xu, Ying Sun, Yuanyuan Yin, Yiwei Xue, Fangyan Ma, Chao Song, Hang Yin, Liqing Zhao
Summary: This study investigated the water dissipation pattern from peanut pods under natural drying conditions and examined the effects of varying moisture content, bulk density, and porosity on the relative permittivity of peanut kernels. Different prediction models were developed and analyzed, with the SSA-ELM model showing improved accuracy compared to others.
JOURNAL OF FOOD QUALITY
(2022)
Article
Engineering, Chemical
Fangyan Ma, Dongwei Wang, Yuanyuan Yin, Hang Yin, Chao Song, Xin Xu, Ying Sun, Yiwei Xue, Liqing Zhao
Summary: Measuring the moisture content of peanuts is crucial for production and storage, and this study proposes a new method based on the microwave scattering coefficient. A moisture measurement model was developed using different parameters and prediction models, with the fully connected deep neural network (FC-DNN) showing the best performance. This study not only provides a new method for nondestructive moisture measurement in peanut production, but also has potential applications in other agricultural products.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Agronomy
Hang Yin, Fangyan Ma, Dongwei Wang, Xiaoning He, Yuanyuan Yin, Chao Song, Liqing Zhao
Summary: This study proposes a rapid and nondestructive method for detecting tea leaf moisture content using microwave scattering parameters. By measuring 901 different frequency points between 2.45 and 6 GHz, the relationship between frequency, S-21 amplitude and moisture content, thickness, and bulk density of tea leaves was analyzed. Prediction models based on back propagation neural network, decision tree, and random forest were established. The random forest-based model showed the best performance with high accuracy and precision. This method provides a new approach for the detection of tea moisture content with potential applications in tea processing.
