Article
Chemistry, Physical
Chen Kang, Tao Wang, Changjun Jiang, Kun Chen, Guozhi Chai
Summary: This study investigated the giant magneto-impedance (GMI) effect on ferrimagnetic insulator yttrium iron garnet (YIG) films and spheres, highlighting the significant role of ferromagnetic resonance effect. The results showed distinct impedance variations in the transmission line loaded with single crystalline YIG samples depending on the external magnetic field, indicating a substantial GMI effect. The maximum GMI ratio reached 256% with a corresponding magnetic response of 8.8%/Oe, suggesting the potential use of single crystalline YIG films in chip-scale magnetic sensors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Wei Gu, Kevin Luong, Zhi Yao, Han Cui, Yuanxun Ethan Wang
Summary: Utilizing ferromagnetic resonance of thin-film ferrites can improve the radiation efficiency and input impedance matching of electrically small antennas simultaneously. Experimental results of a prototype with a thin-film yttrium-iron-garnet (YIG) core match well with simulation results, demonstrating the efficacy and significance of this concept. Broadband equivalent circuit models are effective in predicting the input impedance and radiation efficiency of FMR-enhanced ESAs at a precision comparable with full-wave simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Chemistry, Multidisciplinary
Basil Chacko, Avanish Babu Thirumalasetty, Vembakam Vijayakanth, Madhuri Wuppulluri
Summary: This study investigates the viability of yttrium iron garnet (YIG) in magnetic hyperthermia treatment. YIG is synthesized using hybrid microwave-assisted hydrothermal and sol-gel auto combustion techniques. The formation of the garnet phase is confirmed using powder X-ray diffraction studies. The morphology and grain size of the material are analyzed by field emission scanning electron microscopy. The properties and efficiency of YIG in magnetic induction heating are evaluated using specific absorption rates.
Article
Engineering, Electrical & Electronic
Binshan Zhao, Min Tang, Zijian Shao, Yueping Zhang, Junfa Mao
Summary: Compact grid array antennas with gradient slow-wave structures are designed. By using slow-wave transmission lines with exponential gradient structure, the proposed antenna achieves an area-reduction factor, impedance bandwidth, and maximum gain.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Chemistry, Applied
Qiang Liu, Wenli Wang, Zhengfa Dai, Vitalii Boiko, Haohong Chen, Xin Liu, Danyang Zhu, Jian Xu, Dariusz Hreniak, Jiang Li
Summary: In this study, Ce3+-doped transparent ceramics were successfully prepared and the effects of Ce3+ concentration and annealing atmospheres on their performance were investigated.
JOURNAL OF RARE EARTHS
(2022)
Article
Engineering, Electrical & Electronic
Farzad Karami, Pejman Rezaei, Ali Amn-e-Elahi, Ashkan Abolfathi
Summary: This article presents the efficient development of a new class of multilayer microstrip patch antenna fed by a substrate integrated waveguide (SIW) for X-band applications. The proposed structure offers miniaturization, performance enhancements, cost reductions, and easy integration with microstrip technology. The patch array composed of three stacked layers demonstrates high radiation efficiency, large gain, and ease of use.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2021)
Article
Engineering, Electrical & Electronic
Wen-Hai Zhang, Quan Xue, Shaowei Liao, Wenquan Che, Wanchen Yang
Summary: In this paper, low-profile compact microstrip magnetic dipole antennas with large beamwidth and broad bandwidth are proposed for vehicular applications. The design features include introducing electric current sources, using an equivalent complementary source model, improving impedance bandwidth, miniaturizing antenna size, and achieving impressive results for impedance bandwidth and maximum half-power beamwidth under very low profile. Comparing with other design approaches, the proposed designs showcase a very low profile structure, superior beamwidth and bandwidth properties, as well as simple configuration and compact size.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Long Zhang, Ning Luo, Yuhang Sun, Yejun He, Sai-Wai Wong, Peng Chu, Chunxu Mao, Steven Gao
Summary: This communication presents an ultrawideband stacked single-turn spiral antenna with an integrated feeding structure. By connecting two vertically stacked planar single-turn Archimedean spirals through two vertical posts, the traveling-wave current path is lengthened to decrease the operating frequency, while an integrated tapered microstrip line is used for feeding. The proposed antenna demonstrates enhanced impedance and axial ratio bandwidth, making it a good candidate for ultrawideband applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Guangxu Shen, Wenjie Feng, Wenquan Che, Yongrong Shi, Yiming Shen
Summary: This study proposes a mm-wave dual-band bandpass filter with large bandwidth ratio using GaAs IPD technology, achieving a significant fractional bandwidth ratio and low insertion loss for the lower passband at 28 GHz. The design of a dual-mode on-chip resonator and the introduction of electric and magnetic couplings between adjacent resonators contribute to the realization of this dual-band filter for potential applications in mm-wave wireless systems.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Engineering, Electrical & Electronic
S. M. Shamim, Muhammad Shahin Uddin, Md. Rabiul Hasan, Mousume Samad
Summary: The paper presents a graphene-based microstrip patch antenna at 0.72 THz for wireless communication applications, showing a significant impedance bandwidth and excellent performance in simulations at the resonant frequency. This antenna design could be a great candidate for future wireless communication, medical imaging, homeland defense system, explosive detection, and material characterization applications.
JOURNAL OF COMPUTATIONAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Sai Radavaram, Saininad Naik, Maria Pour
Summary: The study addresses the polarization instability issue at high frequencies in U-slotted wideband antennas by utilizing the TM12 mode in circular patch antennas. The proposed antenna offers stable polarized waves over a wide frequency range and achieves desired impedance and radiation characteristics by integrating U-slots, shorting vias, and non-resonating arc slits. The antenna’s polarization stability is demonstrated through surface current distributions, radiation patterns, and x- and y-polarized gains across the frequency range of interest.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Information Systems
Budhadeb Maity, Sisir Kumar Nayak
Summary: This article introduces a compact, dual-band, dual-circularly polarized (CP) traveling wave series-fed circular slit microstrip array antenna for quad-band CP operation in WiMAX and WLAN applications. Additionally, modern machine learning regression techniques are used to enhance the accuracy of the model, making it suitable for WiMAX and WLAN applications.
Article
Engineering, Electrical & Electronic
Tong Li, Huanhuan Yang, Qi Li, Liaori Jidi, Xiangyu Cao, Jun Gao
Summary: A novel integration strategy of microstrip antenna and metasurface is proposed to achieve low-RCS and improved radiation performance on a stealth cylindrical carrier. By optimizing antenna design and analyzing working mechanism, the gain is enhanced and impedance bandwidth is extended, while achieving RCS reduction both in-band and out-of-band simultaneously.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Zhanliang Wang, Xing Liu, Qiang Hu, Yubin Gong, Zhaoyun Duan, Huarong Gong, Zhigang Lu, Shaomeng Wang, Jinjun Feng
Summary: This article introduces an angular log-periodic meander-line traveling wave tube (TWT), which is characterized by low voltage, small size, high power, and low cost, and is considered as a key component in advanced communication systems, future biomedical applications, and electronic counter measure instruments. Particle in cell (PIC) simulations show that the TWT can achieve an output power of 55 W at 34 GHz with an operation voltage of 1800 V and a beam current of 0.2 A.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Crystallography
Huiting Zhang, Zhonghua Zhu, Shengdi Ta, Ninghan Zeng, Limin Wu, Wenxia Wu, Peng Zhang, Shoulei Xu, Bernard Albert Goodman, Wen Deng
Summary: High-quality single crystals with empirical composition Y2.96Sm0.04Ga5O12 (YGG: Sm3+) were prepared by the optical floating zone method for the first time and compared with Y2.96Sm0.04Ga5O12 (YAG: Sm3+) single crystals. Both crystals showed Sm3+ entering cubic-phase structure according to XRD. Optical absorption spectra revealed peaks from Sm3+ in the 250 nm to 550 nm range, and photoluminescence excitation (PLE) spectra detected strong excitation peaks at 407 nm and 468 nm. A bright emission peak at 611 nm was observed in the photoluminescence (PL) spectra under excitations at both 407 nm and 468 nm, with the YGG: Sm3+ crystal exhibiting higher intensity and color purity than the YAG: Sm3+ crystal. The fluorescence lifetime of YGG: Sm3+ crystal was also longer.
