Article
Engineering, Electrical & Electronic
Yongtao Li, Hanyan Li, Zhenglin Li, Jinjun Feng, Fengyi Liao, Shaoming Pan, Xuefeng Mai
Summary: In this study, W-band FWG circuits were produced using UV-LIGA technology with high dimensional accuracy. The dimension error had no obvious effect on the S12-parameters within the operating bandwidth range.
MICROELECTRONIC ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Yongtao Li, Hanyan Li, Jinjun Feng
Summary: This article focuses on fabricating a 340-GHz folded waveguide (FWG) using two-step UV-Lithographie Galvonoformung Abformung (LIGA) technology. The accuracy of the FWG's height and width is determined by the process parameters. The effects of processing parameters on patterns are explained in detail, and the transmission properties of the fabricated FWG are measured and verified.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Cristian Bocciarelli, Francesco Centurelli, Pietro Monsurro, Valerio Spinogatti, Alessandro Trifiletti
Summary: This paper presents an evolution of the Sallen-Key biquad architecture suitable for high-frequency applications. By utilizing the pole of the buffer amplifier as one of the poles of the biquad, the limitations on the maximum resonance frequency are overcome. This approach allows for the design of low-pass filters with cutoff frequencies above 10 GHz, without the need for bulky inductors, while providing good linearity performance through the use of feedback.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Run Cao, Jing-Ya Deng, Rui-Min Shang, Wei Lin, Zhijiao Chen
Summary: This paper proposes a novel dual-mode ridged substrate integrated waveguide (RSIW) cavity resonator with miniaturized dimension and independently controllable resonant frequencies. By designing a ridge patch on the upper surface of the bottom substrate and connecting it with five shorting vias and four slots, the resonant frequencies of the TE110 and TE120 cavity modes are effectively down-shifted. Moreover, the resonant frequencies of the two modes can be independently adjusted by tuning two vias and the slots on the ridge patch. A dual-band bandpass filter is designed to verify the feasibility of the proposed RSIW cavity resonator and achieves a 62% size reduction compared with the conventional SIW filter without the ridge.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Clara Maximo-Gutierrez, Juan Hinojosa, Alejandro Alvarez-Melcon
Summary: This paper proposes a design method for Chebyshev band-pass filters based on groove gap waveguide (GGW) technology and evanescent mode for the first time. The design method reduces the analysis number and computation cost, and solves the discretization problem of the evanescent mode section. A fourth-order Chebyshev band-pass GGW filter is designed and the measured results show good agreement with electromagnetic simulation results. The proposed GGW band-pass filter has a reduced size and high-performance characteristics, making it beneficial for future emerging communications systems.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Jun-ping Duan, Xin-xin Shen, Hong Xiao, Bin-zhen Zhang, Qiong Bai
Summary: This paper presents a W-band dual-band waveguide filter using SU-8 photoresist UV lithography technology, which shows good performance and excellent process feasibility.
MICROELECTRONICS JOURNAL
(2021)
Review
Multidisciplinary Sciences
Josep M. Jornet, Edward W. Knightly, Daniel M. Mittleman
Summary: This article discusses the challenges and potential applications of wireless platforms above 100 GHz. There is rapid advancement in the field of sub-terahertz wireless communications, with major research efforts worldwide. To overcome the hurdles associated with using these high frequencies, new capabilities for sensing and manipulating broadcasts are required. A vision for future wireless systems is emerging, addressing the forefront challenges and solutions beyond 5G.
NATURE COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Sadia Farjana, Ashraf Uz Zaman, Per Lundgren, Peter Enoksson
Summary: This study presents a micromachined ridge gap waveguide power divider operating at 220-325 GHz. The device is fabricated using SUEX dry film photoresist, which enables high accuracy geometric features and a robust fabrication process. The designed power divider has simple geometrical features and wide band performance. Measurement results are in good agreement with simulations, demonstrating the suitability of the proposed fabrication method for waveguide components in the millimeter and sub-millimeter wave range. The low-loss ridge gap waveguide power divider may enable cost-effective and rapid fabrication of passive devices operating up to THz frequencies.
Article
Computer Science, Information Systems
Hector Garcia-Martinez, German Torregrosa-Penalva, Ernesto Avila-Navarro, Nicolo Delmonte, Lorenzo Silvestri, Maurizio Bozzi
Summary: This paper presents a new method for designing band-pass filters in an empty waveguide using periodic structures, which is validated theoretically and experimentally. The proposed method utilizes a periodic profile in the central part of an Empty Single-Ridge Waveguide (ESRW) to generate an Electromagnetic Band-Gap (EBG), providing simple design parameters for specific dispersion characteristics. Experimental results confirm the performance of the designed filters.
Article
Engineering, Electrical & Electronic
Shizhuang Yan, Jun Wang, Xianglin Kong, Ruofeng Xu, Zhao-Min Chen, Jian-Yu Ma, Lei Zhao
Summary: A THz ultra-broadband band-pass filter based on coplanar-waveguide and spoof surface plasmon polaritons (SSPPs) is proposed, which can operate from 0.65 THz to 2.02 THz efficiently and compactly. The lower and upper cut-off frequencies can be controlled independently by changing parameters.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Information Systems
Young-Ho Cho, Cheolsoo Park, Sang-Won Yun
Summary: The study proposes a switchable dual/single-band tunable bandpass filter using a single J-inverter, achieving high stopband attenuation and potential for wideband cognitive radio applications.
Article
Computer Science, Information Systems
Jie Wang, Yun Zhao, Jiang-Qiao Ding
Summary: In this paper, two 3rd-order quasi-elliptical waveguide bandpass filters operating at 400 GHz were developed based on oversized resonators in TE102 mode. Transmission zeros were generated through physical cross-couplings and mixed modal bypass couplings. The use of H-plane off-axis coupling structures without fragile irises improved robustness and simplified manufacturing at high terahertz frequencies.
Article
Engineering, Electrical & Electronic
Sheng Li, Yu-Tao Yan, Shi-Cheng Yang, Zhong-Bo Zhu, Xiao-Jun Li, Cai-Xia Wang, Wei Shao, Jiang-Qiao Ding
Summary: This paper proposes a dual-band filter using TM dual-mode cavities based on stackable multilayer MEMS technology for highly compact design. The filter achieves dual-band response by introducing TM120 and TM210 dual modes in a nearly square cavity. The non-resonating mode of TM110 in the cavity is exploited as modal bypass coupling, generating two transmission zeros near each passband. A 220 GHz 3rd-order dual-band waveguide filter is fabricated through silicon-based micromachining and nine stacked silicon platelets packaging techniques, with a compact thickness of only 2.34 mm. The measurements show a 3-dB fractional bandwidth of 4% from 217.5 to 226.5 GHz and 2.9% from 235.5 to 242.5 GHz, low insertion loss of about -1.2 dB, and four obvious transmission zeros in the out-of-band.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2023)
Article
Engineering, Electrical & Electronic
Jiang-Qiao Ding, Jie Hu, Sheng-Cai Shi
Summary: Two coplanar waveguide bandpass filters working at 350 GHz are designed based on quarter-wavelength stepped impedance resonators, using superconducting niobium film patterning technology. The study indicates that these filters can be applied in future terahertz astronomical spectrometer.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Povilas Vaitukaitis, Kenneth Nai, Jiasheng Hong
Summary: This paper presents a novel multiband waveguide filter model employing cylindrical resonators arranged horizontally and vertically in Olympic and parallel topologies, with the advantages of reduced footprint and the ability to realize more complex filtering functions.
Article
Engineering, Electrical & Electronic
Wang Xin, Zhang Binzhen, Wang Wanjun, Wang Junlin, Duan Junping
IEEE PHOTONICS JOURNAL
(2017)
Review
Physics, Condensed Matter
Zongli Wang, Xin Wang, Junlin Wang
Summary: Metamaterial sensors, composed of subwavelength metal resonance elements arrays on semiconductor or dielectric substrates, exhibit excellent characteristics due to strong localization and enhancement of resonance electromagnetic fields. They can break through resolution limits of traditional sensors, offering advantages of high sensitivity, fast response, and simple measurement. By optimizing microstructures and changing substrate materials, these sensors show significant enhancement in sensing abilities, with potential applications in environmental monitoring, food safety control, and biosensing in the future.
ADVANCES IN CONDENSED MATTER PHYSICS
(2021)
Article
Computer Science, Information Systems
Rui Shao, Xiaomin Chen, Junlin Wang, Xin Wang
Summary: The paper presents a design of an eight-port dual-polarized shared-radiator antenna for 5G mobile devices, achieving high isolation and efficiency in limited space. Utilizing orthogonal placement of feed lines to produce dual polarization, the antenna system demonstrates high isolation without additional decoupling structures. Additionally, the impact of human body models on the antenna performance is discussed.
Article
Chemistry, Analytical
Hao Li, Junlin Wang, Xin Wang, Yao Feng, Zhanshuo Sun
Summary: In this article, we propose and design a metamaterial broadband stop-band filter with a steep cut-off in the terahertz region. The filter is based on the flexible structure of metal-dielectric-metal-dielectric-metal (MDMDM). It has excellent characteristics and wide potential applications.
Article
Chemistry, Analytical
Zhanshuo Sun, Xin Wang, Junlin Wang, Hao Li, Yuhang Lu, Yu Zhang
Summary: This study proposes a switchable multifunctional multilayer terahertz metamaterial using the phase-transition properties of vanadium dioxide (VO2). The metamaterial can be controlled to switch between transmission and reflection and achieve polarization conversion. Various functions can be switched freely by changing the conductivity of VO2, making it a promising candidate for highly sensitive sensors, optical switches, and polarization converters.
Article
Chemistry, Analytical
Yuehui Gao, Junlin Wang, Xin Wang, Rui Shao
Summary: This paper proposes a highly isolated multiple-input multiple-output (MIMO) antenna array for fifth-generation (5G) metal frame smartphones. The antenna, consisting of eight identical small-sized inverted F-shaped folded slots etched on the metal frame, allows for adjustable bandwidth by modifying one short branch. Moreover, the positions of the antenna elements are carefully arranged to achieve ideal spatial diversity and effectively reduce coupling. The MIMO antenna system also includes small combination slots to improve element isolation. Simulation, fabrication, and measurement results demonstrate good impedance matching, high isolation, and reliable anti-interference performance. The radiation efficiencies of the MIMO antenna system exceed 50%.
Article
Environmental Sciences
Xiaokai Wei, Jie Li, Ding Han, Junlin Wang, Ying Zhan, Xin Wang, Kaiqiang Feng
Summary: This paper proposes a fast in-flight alignment method based on the Lie group for the low-cost strap-down inertial navigation system/global positioning system integrated navigation system. By establishing an in-flight alignment model based on vector observations and using an improved unscented Kalman filter to estimate and feedback correlated errors, the challenging problem of alignment for flight body with short-endurance and high-speed rotation is solved. Evaluation of the proposed method in comparison with existing methods indicates that it has better alignment accuracy and faster alignment velocity.
Article
Engineering, Electrical & Electronic
Tonghui Li, Xiaofeng Duan, Kai Liu, Yongqing Huang
Summary: This paper proposes a hybrid genetic algorithm (HGA) to simplify the process of photodiode parameter extraction and compares its performance with other optimization algorithms. The results show that HGA has better performance in parameter fitting, convergence speed, and accuracy.
MICROELECTRONICS JOURNAL
(2024)
Article
Engineering, Electrical & Electronic
Prachuryya Subash Das, Deepjyoti Deb, Rupam Goswami, Santanu Sharma, Rajesh Saha
Summary: This article proposes the investigation of low power performance of a fin field-effect transistor (FinFET) with surrounding gates using a calibrated technology computer-aided design (TCAD) framework. The study explores the impact of core dimensions and gate edge suppression on the electrical parameters of the device. It is found that reducing the channel length by 35% improves the overall low power performance of the FinFET.
MICROELECTRONICS JOURNAL
(2024)
