JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 5
·2125-2133
·
IF 3.502
Naichao Chen,Bin Xiao,Xinwei Xu,Tao Sun,Fei Jin,Meiyu Chen,Xianqiang Chen,Hong Wang
(1- x )Na 2 WO 4 – x Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 (NWO-NCZO) ceramic composites ( x = 0–0.6) were successfully prepared by the cold sintering method under a uniaxial pressure of 200 MPa at 150°C for 30 min. The microstructures and electromagnetic properties of (1- x )NWO- x NCZO ceramic composites with different NCZO contents have been systematically investigated. The obtained biphasic NWO-NCZO ceramic composites possess dense microstructures. The 0.4NWO–0.6NCZO ceramic composite exhibits a matched relative permittivity and relative permeability of around 8 in the frequency range from 10 to 200 MHz, which is beneficial for impedance matching between antenna and free space. A prototype of microstrip antenna based on the developed NWO-NCZO ceramic composite is designed and to demonstrate its application in miniaturized antennas. The simulation results revealed that the size of the radiation patch of the antenna can be reduced by 60% yet with bandwidth being enhanced 26.5 times when the 0.4NWO–0.6NCZO ceramic composite is selected as the substrate instead of pure NWO ceramic.
研究领域:
材料科学
·
电磁工程
·
陶瓷工程
✓ 已验证
DOI
高影响因子
IEEE ANTENNAS AND PROPAGATION MAGAZINE
·
2021
·Vol. 63
·期 5
·118-144
·
IF 2.593
Ziyang Zheng,Yue Ping Zhang
This article presents a finite difference time domain (FDTD) analysis of a probe-based millimeter-wave (mm-wave) far-field antenna measurement setup. First, it is found that a full-wave simulation of the entire setup requires formidable computational resources, and thus a reasonable simplification of the setup model is made. Then, an electric dipole antenna operating at 28 GHz is placed in the setup, and the reflected/scattered/refracted/absorbed/diffracted/obstructed field distribution and distortion on radiation patterns by equipment are simulated. Finally, a quiet zone assessment is conducted.
研究领域:
电磁学
·
天线工程
·
毫米波技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 14
·6611-6619
·
IF 7.233
Jinyong Hu,Meiyan Wu,Li Jiang,Zhensheng Zhong,Zhangkai Zhou,Thitima Rujiralai,Jie Ma
The association of a plasmonic nano-antenna with single-molecule FRET technique presents new prospects to investigate the dynamics of biological molecules. However, the presence of a plasmonic nano-antenna significantly modifies the FRET rate and efficiency; this makes its applicability to the prevalent single-molecule FRET experiments unclear. Herein, using gold nanoparticle antennas of different sizes and DNA hairpins labelled with FRET pairs (Cy3 and Cy5) as the model system, we performed experiments to study the folding dynamics of single DNA hairpins at various salt concentrations. Our results indicate that gold nanoparticle antennas can enhance single-molecule fluorescence of Cy3 and Cy5 up to 3–5 folds, substantially reduce the FRET efficiency, and alter the obtained FRET efficiency histograms. However, the folding dynamics of DNA hairpins remains unaffected, and the correct kinetic and dynamic information can still be extracted from the seriously modified FRET efficiencies. Therefore, our experiments demonstrate the feasibility and compatibility for applying plasmonic nano-antennas to the mostly used single-molecule FRET assays, which provide a broad range of possibilities for the future applications of these nano-antennas in studying various essential biological processes.
研究领域:
生物物理
·
分子生物学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xiaoyu Li,Denghao Ma,Xinwei Xu,Hongye Wang,Fei Jin,Jin Cheng,Biao Guo,Cong Liu,Hong Wang
The increasing demand for electronic devices operating in specific frequency bands (e.g., X-band dielectric resonator antennas) has driven the development of materials with precisely tunable permittivities. Metamaterials with artificially engineered microstructures are promising for tailoring the effective permittivity to meet application-specific requirements. By leveraging the high precision of 3D printing, this work achieves precise control over the effective permittivity by accurately adjusting the geometric parameters of metastructures and establishes a permittivity prediction model for composite materials using effective medium theory. The application-driven design of a graded dielectric metamaterial is demonstrated through an X-band dielectric resonator antenna with the following significant performance improvements: a broad bandwidth (6.2 GHz) covering the entire X-band (8–12 GHz), whereas the conventional bandwidth is only 1.7–4.2 GHz, and a gain value of 14.7 dB. This study paves the way for the development of high-performance antennas, radio frequency components, and frequency-selective devices with enhanced frequency adaptability and integration.
研究领域:
材料科学
·
电磁学
·
微波工程
·
增材制造
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Bing Liu,Ke Sha,Meng Fei Zhou,Kai Xin Song,Yu Hui Huang,Cheng Chao Hu
Two novel low- ε r gallates MGa 2 O 4 (M = Ca, Sr) have been synthesized via a standard solid-state reaction method. According to the X-ray diffraction results, CaGa 2 O 4 crystallizes in space group Pna2 1 with an orthorhombic symmetry, while SrGa 2 O 4 belongs to the monoclinic P2 1 / c system. Both ceramics show ever-improving microstructures with the increasing sintering temperature . The optimal microwave dielectric properties ( ε r = 9.2, Qf = 66,000 GHz, τ f =–85 ppm/°C for SrGa 2 O 4 and ε r = 10.6, Qf = 15,400 GHz, τ f =–58 ppm/°C for CaGa 2 O 4 ) are obtained when sintered at 1275 °C. A patch antenna is fabricated using SrGa 2 O 4 ceramics as the substrate, which realizes a return loss of –19.94 dB and total efficiency of –1.38 dB (72.8 % in power ratio) at 4.84 GHz. The exceptional performances indicate that SrGa 2 O 4 ceramics are promising candidates for antenna applications at the Sub-6 GHz band.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 4
·512
·
IF 2.67
Zhijian Wang,Feng Pan,Lanlan Liu,Qifeng Du,Ruitao Tang,Jun Ai,Hong Zhang,Ying Chen
Mg2SiO4holds promise for its application in the microwave communication field due to its low dielectric constant and highQ×fvalue. However, its high negativeτfand high sintering temperature limit its application in low-temperature co-fired ceramic (LTCC) devices. In this work, Li2TiO3and CaTiO3were introduced to improve theτf, and LiF was chosen to decrease the sintering temperature. According to XRD patterns and SEM micrographs, the ceramic systems displayed a complex-phase structure, and the microstructure was densified when CaTiO3was added. All of the relative densities, dielectric constants, andQ×fvalues first increased and then decreased as the sintering temperature increased. The MLLC11.5 ceramics sintered at 800 °C could be obtained with the highestQ×fvalue of 54,581 GHz (at 8.06 GHz),εrof 14.13, andτfof + 5.81 ppm/°C. Furthermore, it was proven that the MLLC11.5 powders could be co-fired without any reaction with Ag powders at 800 °C, indicating its potential for LTCC application. The MLLC11.5 composition was used to prepare a GPS antenna and showed good prospects for its application in electronic communications.Keywords:Mg2SiO4-Li2TiO3-LiF-CaTiO3ceramics;structure;microwave dielectric property;LTCC;antenna
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 13
·18205-18211
·
IF 2.478
Jin Ding Hao,Hu Cheng Chao,Liu Bing
CaAl 2 − 2 x Zn x Ti x O 4 ( x = 0.05, 0.10, 0.15) ceramics with low permittivity have been prepared via a standard solid-state reaction method. The partial co-substitution of (Zn 0.5 Ti 0.5 ) 3+ for Al 3+ can effectively lower the sintering temperature of CaAl 2 O 4 ceramics by approximately 200 °C. Meanwhile, the large negative temperature coefficient of resonant frequency ( τ f = − 55 ppm/°C) of CaAl 2 O 4 ceramics can be simultaneously modified toward zero. With increasing x , the quality factor ( Q f ) indicates a downward changing trend owing to the appearance of ZnAl 2 O 4 and CaTiO 3 secondary phases. The optimum microwave dielectric properties ( ε r = 11.9, Q f = 28,090 GHz, and τ f = − 1.2 ppm/°C) are achieved at x = 0.15. Moreover, a microstrip patch antenna is fabricated using the x = 0.15 ceramic as the dielectric substrate. The fabricated antenna demonstrates a S 11 value of − 17.8 dB at 4.9 GHz and a measured − 10 dB bandwidth of 86 MHz. The good antenna performances suggest that the present ceramics are good candidates for 5G antenna applications at the sub-6 GHz band.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 41
·19586-19594
·
IF 7.233
Jia Liu,Kai Chen,Gui-Ming Pan,Zhi-Jun Luo,Ying Xie,Ying-Ying Li,Yong-Jie Lin,Zhong-Hua Hao,Li Zhou,Si-Jing Ding,Qu-Quan Wang
In this study, we synthesized CdS/(Au–ReS2) nanospheres that have highly efficient photocatalytic hydrogen production activity induced by dielectric–plasmon hybrid antenna resonance. As the diameter (D) of ReS2 nanospheres consisting of 2D nanosheets increases from 114 ± 11 to 218 ± 25 nm, the resonance wavelength of the ReS2 dielectric antenna is tuned from 380 to 620 nm and the hydrogen production rate for the CdS/(Au–ReS2) nanospheres increases by more than 1.85 times and reaches a value as high as 3060 μmol g−1 h−1, with a 9% weight percentage of Au. Due to the enhancements of the local electromagnetic field and excitation energy transfer by the ReS2–Au dielectric–plasmon hybrid antenna, the hydrogen production rate for the CdS/(Au–ReS2) nanospheres (D = 218 ± 25 nm) is 797, 319, 105 and 12 times larger than that for pure ReS2, Au–ReS2, CdS, and CdS–ReS2, respectively. Additionally, the persistence and reusability measurements indicate a favorable stability of CdS/(Au–ReS2). These results provide a strategy to prepare a new class of dielectric–plasmon hybrid antennas consisting of 2D materials and metal nanoparticles, which have promise in applications ranging from photocatalysis to nonlinear optics.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guo Tian,Zhicong Chen,Linzhao Ma,Qianbiao Du,Longxiang Jiang,Hongzhi Xiao,Hao Li
Li 5 Mg 4 NbTiO 11 - x wt% LiF microwave dielectric ceramics were successfully developed using the solid state way. The phase structure, microstructure, Raman vibration, and microwave dielectric properties of LiF doped Li 5 Mg 4 NbTiO 11 ceramics were studied. The researches show that LiF doping can effectively decrease the sintering temperature of Li 5 Mg 4 NbTiO 11 ceramic. At x = 6, the ceramic sintered at 860 °C show the best performance ( ε r = 15.56, Q × f = 89,713 GHz, and τ f = −40.48 ppm/°C) and is chemically compatible with Ag electrodes. In addition, a dual-frequency dielectric resonant antenna based on 6 wt% LiF-doped ceramics was designed, which has high gain (2.94 and 6.90 dBi) and efficiency (75.5 and 95.6 %) around the resonant frequency (2.4 and 6 GHz). The comprehensive results show that this material is not only a promising LTCC material, but also a viable candidate material for 5/6G applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Pengxiang Si,Mingrui Liang,Jihua Zou,Yu Kuang,Juntao Zhang,Qingsha S. Cheng,Yiqian Kong,Yuxin Cai,Guozhi Huang,Yun Wu,Zhu Long,Boxin Zhao,Dan Zhang
Bio-integrated electronic devices are skin-mounted accurate tools for acquiring biological signals. The knee joint is one of the most important joints for human movement, playing a crucial role in functions such as walking, standing, sitting and containing important physiological health information about orthopedic disease diagnosis, prevention, and rehabilitation. However, it is still challenging to precisely and directly monitor joint rotation via skin-mounted bio-integrated electronic devices because joints are hidden inside the skin. In this study, we design a reusable, sustainable, battery-free, wireless, and flexible antenna sticker to adhere to the skin that can directly measure knee joint rotation degree. The antenna sticker is adhered to the lower leg and powered by electromagnetic radiation from a radio frequency identification (RFID) reader. When rotating the knee, the distance between the antenna sticker and the reader changes, leading to an alteration in the received signal strength indicator (RSSI). Meanwhile, the 3D optical motion capture system collects joint rotation data as a “gold standard”. After matching two series of real-time data using the Gaussian method, one RSSI can represent one specific joint rotation degree. The antenna sticker is stable at a variety of humidity and temperatures. The antenna sticker shows great potential to sense joint rotation and human motions. The scientific insights and engineering principles revealed in this antenna sticker will be applicable to a broad range of applications including skin-mounted epidermal electronics and wearable devices.
研究领域:
生物医学工程
·
电子皮肤
·
无线通信
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 4
·2638-2647
·
IF 2.599
Xu Fang,Zhang Huaiwu,Jin Lichuan,Li Yuanxun,Li Jie,Gan Gongwen,Wei Miaoqin,Li Mingming,Liao Yulong
Transient electronic is an emerging field that designed electronic devices can be fleetly and partially (or completely) degraded when transiency is triggered. Here, a class of PVA-based degradable composite film was synthesized, whose physical properties allow it to be used as substrate material for transient electronic devices. We found the dielectric properties and dissolution rate of the composite film can be tuned by controlling the TiO 2 nanoparticle addition. Based on the as-synthesized PVA/TiO 2 composite film, patch antennas were further designed and fabricated. The antennas were found to possess excellent radiation performances at a frequency of 2.5 GHz. Most importantly, the antennas could be physically degraded within 1 h when immersed in pure water. This study shows that the PVA-based film is a good candidate substrate or supporting material for transient electronics. In addition, the design and manufacture methods reported here provide a reference for other transient devices with complex structure and function.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Bing Liu,Ke Sha,Meng Fei Zhou,Kai Xin Song,Cheng Chao Hu,Cheng Lu
A cold sintering process is adopted to pre-densify CaF 2 ceramics from 85.7% at 300 MPa to 91.7% at 750 MPa. Subsequent post-annealings at 1000–1150 °C lead to further improvements in densification, where great enhancements of grain size and crystallinity are also observed from the scanning and transmission electron micrographs. Significant advances in Qf values are achieved in the post-annealed CaF 2 ceramics. The optimum Qf value (80,522 GHz) is achieved after cold sintering at 750 MPa and post-annealing at 1000 °C, which is three times higher than the conventional sintered one at 1000 °C (26,448 GHz). Moreover, the obtained low- ε r (5.9–6.5) of CaF 2 ceramics suggests broad application prospects in the high-band microwave communications. A microstrip patch antenna is fabricated using the CaF 2 ceramics as the substrate, which operates at 7.89 GHz in the C-band, with an S 11 of −13.4 dB, simulated high gain and efficiency of 6.41 dBi and −0.56 dB, respectively.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）