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Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator Research Articles
Xingye Fan, Ruozhou Li, Jing Yan, Yuming Fang, Ying Yu,jing.yan@njupt.edu.cn,ying_yu_001@163.com
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9, Pages 1270-1276 doi: 10.1631/FITEE.2000278
Keywords: 可调阶梯阻抗谐振器;液晶;共面波导
An Effective Method for Improving Silicon Micro-resonator System Performance
Xia Dunzhu,Wang Shourong,Zhou Bailing
Strategic Study of CAE 2006, Volume 8, Issue 10, Pages 71-74
The working principle of silicon micro-resonator system was firstly introduced. An intelligence silicon micro-resonator system design and realization was presented in focus. Its two step working flows for roughness and fineness searching and digital interface technology were analyzed in detail. Combined with experimental data and sweeping curve, two different searching results came out under different vacuum circumstance and its working performance was well evaluated.
Keywords: direct digital synthesis (DDS) silicon micro-resonator AD9954 digital signal processing
Parul DAWAR, N. S. RAGHAVA, Asok DE
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 11, Pages 1883-1891 doi: 10.1631/FITEE.1601193
Keywords: Ultra-wideband (UWB) Antenna Metamaterial
Diversity Glass Antennas for Tri-Band WiFi Applications Article
Peng Fei Hu, Kwok Wa Leung, Kwai Man Luk, Yong Mei Pan, Shao Yong Zheng
Engineering 2023, Volume 23, Issue 4, Pages 157-169 doi: 10.1016/j.eng.2022.09.011
This paper investigates two novel polarization- and pattern-diversity glass dielectric resonator antennas (DRAs), both of which are for tri-band (2.4, 5.2, and 5.8 GHz) wireless fidelity (WiFi) applications. It also investigates what type of diversity antenna is most suitable for WiFi router applications by comparing the two DRAs, along with a new space-diversity glass DRA. These three diversity glass DRAs are also compared with a commercial space-diversity monopole pair to benchmark the performance of the glass DRA in WiFi router applications. In our polarization-diversity antenna, a double-port feeding scheme is developed to excite different DRA modes. The frequencies of the DRA modes are tuned by using a stepped DRA. For the pattern-diversity design, a stacked DRA is introduced to broaden the bandwidth for both the conical and broadside radiation modes. All three of the new diversity antennas were fabricated and measured to verify the simulations. In our experiment, the bit error rate (BER) of the three diversity glass antennas and the reference space-diversity monopole antenna was also measured, and the results are compared and discussed. It is found that the polarization-diversity omnidirectional DRA has the most stable BER among the three.
Keywords: WiFi Diversity antennas Multi-frequency Glass Dielectric resonator antennas Multiple-input multiple-output
Mahmoud MODARESI, Hamid LESANI
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 2, Pages 297-307 doi: 10.1631/FITEE.1601689
Keywords: Fault current limiter (FCL) FCL impedance Short circuit current Fault current Power system
Fuzzy impedance control of an electro-hydraulic actuator with an extended disturbance observer Regular Papers-Research Articles
Ming-jie LI, Jian-hua WEI, Jin-hui FANG, Wen-zhuo SHI, Kai GUO
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9, Pages 1221-1233 doi: 10.1631/FITEE.1800155
Keywords: Fuzzy control Impedance control Disturbance observer Parameter uncertainties Electro-hydraulic actuator
A Thermo-Tunable Metamaterial as an Actively Controlled Broadband Absorber Article
Xiao-Chang Xing, Yang Cao, Xiao-Yong Tian, Lingling Wu
Engineering 2023, Volume 20, Issue 1, Pages 143-152 doi: 10.1016/j.eng.2022.04.028
Metamaterials have attracted increasing attention in recent years due to their powerful abilities in manipulating electromagnetic (EM) waves. However, most previously reported metamaterials are unable to actively control full-band EM waves. In this paper, we propose a thermo-tunable broadband metamaterial (T-TBM) using paraffin-based composites (PD-Cs) with different phase transition temperatures. Active control of the T-TBM reflection loss peaks from low to high frequency is realized by manipulating the solid–liquid state of the PD-Cs at different phase transition temperatures. The absorption peak bandwidth (where the reflection loss value is less than −30 dB) can be changed, while the broad bandwidth absorption (where the reflection loss value is less than −10 dB) is satisfied by adjusting the temperature of the T-TBM. It is shown that the stagnation of the phase transition temperature of the PD-Cs in the T-TBM provides a time window for actively controlling the EM wave absorption response under different thermal conditions. The device has a broad application prospect in the fields of EM absorption, intelligent metamaterials, multifunctional structural devices, and more.
Keywords: Metamaterials Active control Thermally tunable Broadband absorption
Integrated 60-GHz miniaturized wideband metasurface antenna in a GIPD process Research Articles
Hai-yang XIA, Jin-can HU, Tao ZHANG, Lian-ming LI, Fu-chun ZHENG
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1, Pages 174-181 doi: 10.1631/FITEE.1900453
Keywords: 60 GHz Antenna-in-package (AiP) Coplanar-waveguide-fed (CPW-fed) ring resonators Glass integrated passive device (GIPD) Metasurface antenna Miniaturized antenna
GaAlAs/GaAs Planar Waveguide Filters Based on Cascade Rectangular Resonators
Cai Chun,Liu Xu,Xiao Jinbiao,Ma Changfeng,Chen Lin,Ding Dong,Zhang Mingde,Sun Xiaohan,Xu Xiaole,Chen Tangsheng,Li Fuxiao
Strategic Study of CAE 2004, Volume 6, Issue 2, Pages 61-66
Based on the electromagnetic model for four-port resonant filter, the optical characteristics of several filters with rectangular cascade resonators have been numerically simulated by utilizing two-dimensional FDTD method. The relationship between the number of cascade resonators and the filtering features is analyzed. The narrow-band filter with four cascade resonators implemented on GaAlAs/GaAs planar waveguide is designed and fabricated. The experiment result shows the half-width of filtering spectrum for the chip is about 10 nm, which coincides well with that of the simulation.
Keywords: WDM planar lightwave circuits optical filters resonator FDTD
Characteristic of the equivalent impedance for an Article
Zhi-zhong TAN, Hong ZHU, Jihad H. ASAD, Chen XU, Hua TANG
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12, Pages 2070-2081 doi: 10.1631/FITEE.1700037
Keywords: RLC network Resonance properties Oscillation characteristics Amplitude-frequency
An adjustable anti-resonance frequency controller for a dual-stage actuation semi-active vibration isolation system Research Articles
Bo Zhao, Weijia Shi, Bingquan Wang, Jiubin Tan,shiweijia@hit.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 10, Pages 1390-1401 doi: 10.1631/FITEE.2000373
Keywords: 半主动隔振;双级驱动;动态吸振;可调反共振频率控制器
Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film Article
Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan
Engineering 2023, Volume 29, Issue 10, Pages 198-206 doi: 10.1016/j.eng.2022.10.005
Transparent microwave absorbers that exhibit high optical transmittance and microwave absorption capability are ideal, although having a fixed absorption performance limits their applicability. Here, a simple, transparent, and thermally tunable microwave absorber is proposed, based on a patterned vanadium dioxide (VO2) film. Numerical calculations and experiments demonstrate that the proposed VO2 absorber has a high optical transmittance of 84.9% at 620 nm; its reflection loss at 15.06 GHz can be thermally tuned from –4.257 to –60.179 dB, and near-unity absorption is achieved at 523.75 K. Adjusting only the patterned VO2 film duty cycle can change the temperature of near-unity absorption. Our VO2 absorber has a simple composition, a high optical transmittance, a thermally tunable microwave absorption performance, a large modulation depth, and an adjustable temperature tuning range, making it promising for application in tunable sensors, thermal emitters, modulators, thermal imaging, bolometers, and photovoltaic devices.
Keywords: Tunable microwave absorber VO2 film Optical transparent Near unity absorption Large modulation depth
Jian Zhou,Dinghong Zhang,Yanghui Liu,Fengling Zhuo,Lirong Qian,Honglang Li,Yong-Qing Fu,Huigao Duan
Engineering 2023, Volume 20, Issue 1, Pages 112-119 doi: 10.1016/j.eng.2022.05.003
Surface acoustic wave (SAW) technology has been extensively explored for wireless communication, sensors, microfluidics, photonics, and quantum information processing. However, due to fabrication issues, the frequencies of SAW devices are typically limited to within a few gigahertz, which severely restricts their applications in 5G communication, precision sensing, photonics, and quantum control. To solve this critical problem, we propose a hybrid strategy that integrates a nanomanufacturing process (i.e., nanolithography) with a LiNbO3/SiO2/SiC heterostructure and successfully achieve a record-breaking frequency of about 44 GHz for SAW devices, in addition to large electromechanical coupling coefficients of up to 15.7%. We perform a theoretical analysis and identify the guided higher order wave modes generated on these slow-on-fast SAW platforms. To demonstrate the superior sensing performance of the proposed ultra-high-frequency SAW platforms, we perform micro-mass sensing and obtain an extremely high sensitivity of approximately 33151.9 MHz·mm2·μg−1, which is about 1011 times higher than that of a conventional quartz crystal microbalance (QCM) and about 4000 times higher than that of a conventional SAW device with a frequency of 978 MHz.
Keywords: Ultra-high frequency SAW Higher order mode Hypersensitive detection
Hui-pin LIN,Xiao-guang JIN,Liang XIE,Jin HU,Zheng-yu LU
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 3, Pages 410-422 doi: 10.1631/FITEE.1600029
Keywords: LLC Full bridge Half bridge Variable frequency Phase shift Wide input voltage range
A Multi-wavelength Star Optical Network Reusing All Channel Wavelengths Three Times and Its Features
Gan Chaoqin
Strategic Study of CAE 2002, Volume 4, Issue 10, Pages 84-89
In this paper, a novel multi-wavelength star optical network reusing all channel wavelengths three times is proposed by the method of “(Distributed Architecture) + (Return Link) + (Wavelength Group)”. In this scheme, by interconnecting four conventional star couplers and reusing all channel wavelengths three times, both the maximum number of supportable nodes and the maximum throughput of the network are all up to four times as many as that of conventional WDM star network. Utilizing bidirectional transmissions in a single fiber, half fibers can be saved under the same number of supportable nodes. Making use of the distributed architecture, the anti-destructibility of network is drastically raised. All these advantages of the network efficiently overcome the disadvantages of conventional WDM star network.
Keywords: wavelength division multiplexing wavelength reuse tunable wavelength router for multiwavelength selection distributed architecture return link wavelength group
Title Author Date Type Operation
Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator
Xingye Fan, Ruozhou Li, Jing Yan, Yuming Fang, Ying Yu,jing.yan@njupt.edu.cn,ying_yu_001@163.com
Journal Article
An Effective Method for Improving Silicon Micro-resonator System Performance
Xia Dunzhu,Wang Shourong,Zhou Bailing
Journal Article
Miniaturized UWB multi-resonance patch antenna loaded with novel modified H-shape SRR metamaterial for microspacecraft applications
Parul DAWAR, N. S. RAGHAVA, Asok DE
Journal Article
Diversity Glass Antennas for Tri-Band WiFi Applications
Peng Fei Hu, Kwok Wa Leung, Kwai Man Luk, Yong Mei Pan, Shao Yong Zheng
Journal Article
New method to determine optimum impedance of fault current limiters for symmetrical and/or asymmetrical faults in power systems
Mahmoud MODARESI, Hamid LESANI
Journal Article
Fuzzy impedance control of an electro-hydraulic actuator with an extended disturbance observer
Ming-jie LI, Jian-hua WEI, Jin-hui FANG, Wen-zhuo SHI, Kai GUO
Journal Article
A Thermo-Tunable Metamaterial as an Actively Controlled Broadband Absorber
Xiao-Chang Xing, Yang Cao, Xiao-Yong Tian, Lingling Wu
Journal Article
Integrated 60-GHz miniaturized wideband metasurface antenna in a GIPD process
Hai-yang XIA, Jin-can HU, Tao ZHANG, Lian-ming LI, Fu-chun ZHENG
Journal Article
GaAlAs/GaAs Planar Waveguide Filters Based on Cascade Rectangular Resonators
Cai Chun,Liu Xu,Xiao Jinbiao,Ma Changfeng,Chen Lin,Ding Dong,Zhang Mingde,Sun Xiaohan,Xu Xiaole,Chen Tangsheng,Li Fuxiao
Journal Article
Characteristic of the equivalent impedance for an
Zhi-zhong TAN, Hong ZHU, Jihad H. ASAD, Chen XU, Hua TANG
Journal Article
An adjustable anti-resonance frequency controller for a dual-stage actuation semi-active vibration isolation system
Bo Zhao, Weijia Shi, Bingquan Wang, Jiubin Tan,shiweijia@hit.edu.cn
Journal Article
Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film
Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan
Journal Article
Record-Breaking Frequency of 44 GHz Based on the Higher Order Mode of Surface Acoustic Waves with LiNbO3/SiO2/SiC Heterostructures
Jian Zhou,Dinghong Zhang,Yanghui Liu,Fengling Zhuo,Lirong Qian,Honglang Li,Yong-Qing Fu,Huigao Duan
Journal Article
A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range
Hui-pin LIN,Xiao-guang JIN,Liang XIE,Jin HU,Zheng-yu LU
Journal Article