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Novel Balun Structure for Dipole Antenna
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作者 Jin Kui Zhang Enze +2 位作者 Yang Yang He Xiaoxiang Gu Changqing 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2017年第5期561-566,共6页
A novel balun structure for dipole antenna,which is based on the current distribution on parallel microstrip lines and the emission cancellation characteristic of close equal and opposite currents,is proposed.The prin... A novel balun structure for dipole antenna,which is based on the current distribution on parallel microstrip lines and the emission cancellation characteristic of close equal and opposite currents,is proposed.The principle of the balun structure is first elaborated and verified.Then,a dipole antenna with resonance at 2.45 GHz is constructed using the balun and its radiation pattern is measured.The simulated and measured reflection coefficients(S_(11))of the antenna are in good agreement 2—3 GHz.The relative bandwidth with an S_(11) of below-10 dB is more than 25%.The antenna also shows a good radiation pattern at 2.45 GHz.The proposed structure can provide a new balun design method for dipole antennas. 展开更多
关键词 coplanar balun dipole antenna WIDEBAND compact balun
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Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers
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作者 刘军华 廖怀林 +2 位作者 殷俊 黄如 张兴 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第11期1911-1917,共7页
A new coarse tuning loop for a wide-band dual-loop frequency synthesizer is presented. The coarse tuning structure is composed of two digital modules, including a successive approximation register and a frequency comp... A new coarse tuning loop for a wide-band dual-loop frequency synthesizer is presented. The coarse tuning structure is composed of two digital modules, including a successive approximation register and a frequency comparator with a novel structure. The frequency comparator counts the prescaler cycles within a certain reference time and compares the number with preset data to estimate the VCO frequency. The frequency comparison error is analyzed in detail. Within a given coarse tuning time,our proposed structure shows a comparison error 20 times smaller than that of other reported structures. This structure also reuses the programmable divider as a part of the coarse tuning loop so that the circuit is greatly simplified. 展开更多
关键词 wide-band coarse tuning loop frequency synthesizer voltage-controlled oscillator
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Effect of Y_2O_3 Content on Microstructure of Gradient Bioceramic Composite Coating Produced by Wide-Band Laser Cladding 被引量:13
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作者 刘其斌 邹江龙 +1 位作者 郑敏 董闯 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第4期446-450,共5页
To eliminate thermal stress and cracks in the process of laser cladding, a kind of bioceramic coating with gradient compositional design was prepared on the surface of Ti alloy by using wide-band laser cladding. And e... To eliminate thermal stress and cracks in the process of laser cladding, a kind of bioceramic coating with gradient compositional design was prepared on the surface of Ti alloy by using wide-band laser cladding. And effect of Y2O3 content on gradient bioceramic composite coating was studied. The experimental results indicate that adding rare earth can refine grain. Different rare earth contents affect formation of HA and β-TCP in bioceramic coating. When the content of rare earth ranges from 0.4% to 0.6%, the active extent of rare earth in synthesizing HA and β-TCP is the best, which indicates that “monosodium glutamate” effect of rare earth plays a dominant role. However, when rare earth content is up to 0.8%, the amount of synthesizing HA and β-TCP in coating conversely goes down, which demonstrates that rare earth gradually losts its catalysis in manufacturing HA and β-TCP. 展开更多
关键词 Y2O3 content wide-band laser cladding gradient bioceramic coating micmstructure rare earths
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基于三导体耦合线的毫米波Marchand balun建模与设计(英文) 被引量:1
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作者 徐雷钧 黄波 +1 位作者 白雪 潘天红 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2015年第6期705-709,共5页
提出了一种基于三导体耦合线结构的毫米波Marchand巴伦的新型宽带模型.基于c模和π模理论,对三导体耦合线进行了分析并采用传输线和理想变压器对其建立了模型.通过电磁场仿真提取了模型参数并使用该耦合线模型建立了Marchand巴伦的模型... 提出了一种基于三导体耦合线结构的毫米波Marchand巴伦的新型宽带模型.基于c模和π模理论,对三导体耦合线进行了分析并采用传输线和理想变压器对其建立了模型.通过电磁场仿真提取了模型参数并使用该耦合线模型建立了Marchand巴伦的模型.基于该模型,使用GaAs工艺设计了一种毫米波Marchand巴伦并进行了流片制造,所设计的巴伦工作在15~55 GHz频率范围,测试结果表明该巴伦具有较好的幅值和相位平衡度,同时验证了模型的准确性. 展开更多
关键词 毫米波 Marchand巴伦 模型 三导体耦合线
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STOCHASTIC OPTIMAL CONTROL OF STRONGLY NONLINEAR SYSTEMS UNDER WIDE-BAND RANDOM EXCITATION WITH ACTUATOR SATURATION 被引量:3
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作者 Changshui Feng Weiqiu Zhu 《Acta Mechanica Solida Sinica》 SCIE EI 2008年第2期116-126,共11页
A bounded optimal control strategy for strongly non-linear systems under non-white wide-band random excitation with actuator saturation is proposed. First, the stochastic averaging method is introduced for controlled ... A bounded optimal control strategy for strongly non-linear systems under non-white wide-band random excitation with actuator saturation is proposed. First, the stochastic averaging method is introduced for controlled strongly non-linear systems under wide-band random excitation using generalized harmonic functions. Then, the dynamical programming equation for the saturated control problem is formulated from the partially averaged Itō equation based on the dynamical programming principle. The optimal control consisting of the unbounded optimal control and the bounded bang-bang control is determined by solving the dynamical programming equation. Finally, the response of the optimally controlled system is predicted by solving the reduced Fokker-Planck-Kolmogorov (FPK) equation associated with the completed averaged Itō equation. An example is given to illustrate the proposed control strategy. Numerical results show that the proposed control strategy has high control effectiveness and efficiency and the chattering is reduced significantly comparing with the bang-bang control strategy. 展开更多
关键词 nonlinear system optimal control actuator saturation stochastic averaging wide-band random excitation
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An ultrathin wide-band planar metamaterial absorber based on a fractal frequency selective surface and resistive film 被引量:2
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作者 范跃农 程用志 +2 位作者 聂彦 王鲜 龚荣洲 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第6期570-575,共6页
We propose an ultrathin wide-band metamaterial absorber (MA) based on a Minkowski (MIK) fractal frequency selective surface and resistive film. This absorber consists of a periodic arrangement of dielectric substr... We propose an ultrathin wide-band metamaterial absorber (MA) based on a Minkowski (MIK) fractal frequency selective surface and resistive film. This absorber consists of a periodic arrangement of dielectric substrates sandwiched with an MIK fractal loop structure electric resonator and a resistive film. The finite element method is used to simulate and analyze the absorption of the MA. Compared with the MA-backed copper film, the designed MA-backed resistive film exhibits an absorption of 90% at a frequency region of 2 GHz-20 GHz. The power loss density distribution of the MA is further illustrated to explain the mechanism of the proposed MA. Simulated absorptions at different incidence cases indicate that this absorber is polarization-insensitive and wide-angled. Finally, further simulated results indicate that the surface resistance of the resistive film and the dielectric constant of the substrate can affect the absorbing property of the MA. This absorber may be used in many military fields. 展开更多
关键词 wide-band metamaterial absorber fractal frequency selective surface resistive films
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Wide-Band Multi-spectral Space for Color Representation 被引量:2
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作者 Kurt Muenger 《Geo-Spatial Information Science》 2003年第2期69-74,共6页
This paper develops a wide-band multi-spectral space for color representationwith Aitken PCA algorithm. This novel mathematical space using the broad-band spectra matchingmethod aims at improving the accuracy of color... This paper develops a wide-band multi-spectral space for color representationwith Aitken PCA algorithm. This novel mathematical space using the broad-band spectra matchingmethod aims at improving the accuracy of color representation as well as reducing costs forprocessing and storing multi-spectral images. The results show that the space can present ourexperimental original spectral spaces (i. e. Munsell color matt and DIN-6164 color chips) with highefficiency, and that the spanning space with three eigenvectors can present the original space atmore than 98% CSCR, and when 5 eigenvectors are used it can cover almost the whole o-riginal spaces. 展开更多
关键词 color representation METAMERISM wide-band multispectral space PCA(principal component analysis)
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Adaptive blind gain correction of time-interleaved ADCs forwide-band communication applications 被引量:1
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作者 Behnaz Papari Davud Asemani Ali Khakpour 《Journal of Measurement Science and Instrumentation》 CAS 2012年第2期157-162,共6页
High spectral efficiency is essential in design of multimedia communication systems such as L-band mobile in addition to various requirements of transmission quality. Time-interleaved A/D converter (TI-ADC) is an ef... High spectral efficiency is essential in design of multimedia communication systems such as L-band mobile in addition to various requirements of transmission quality. Time-interleaved A/D converter (TI-ADC) is an effective candidate to implement wide-band ADC with relatively slow circuits accounting for digital spectrum management. However, practical performance of TI-ADC is largely limited because of mismatches between different channels originated from manufacturing process variations. In this paper, a blind adaptive method is proposed to correct gain mismatch errors in TI-ADC, and it is verified through simulations on a two-channel TI-ADC. In proposed method, gain mismatch error is estimated and corrected in an adaptive scheme. Proposed compensated T1-ADC architecture is structurally very simple and hence suitable for realiza- tion in integrated circuits. Besides, proposed digital compensation algorithm not only is computationally efficient but also provides an improvement of 32.7 dB in the performance of two-channel TI ADC. 展开更多
关键词 time-interleaved A/D converter(TI-ADC) wide-band communications time-division multiple access(TDMA)
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High-Efficiency Wide-Band Cross-Polarization Conversion Using Bi-layered Metal Hole Pairs 被引量:1
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作者 Yong Zhang Xian-Ke Li Cheng-Ping Huang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第10期40-43,共4页
We present a polarization converter composed of bi-layered metal films perforated with rectangle hole pairs in each film. The proposed converter can convert the polarization of an incident linearly-polarized electroma... We present a polarization converter composed of bi-layered metal films perforated with rectangle hole pairs in each film. The proposed converter can convert the polarization of an incident linearly-polarized electromagnetic wave to its orthogonal direction with high efficiency and large bandwidth in the infrared or microwave regions.To make sure of the mechanism of polarization conversion, the current and electric-field distributions at different resonant frequencies are analyzed. It is found that the cross-polarized transmission is due to the near-field coupling between hole pairs in neighboring metal films. Finally, a prototype of the proposed converter is fabricated and measured in the microwave region. Good agreement between the experimental and simulated results is obtained. 展开更多
关键词 High-Efficiency wide-band Cross-Polarization Conversion Using Bi-layered Metal Hole Pairs
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Dynamics of Gradient Bioceramic Composite Coating on Surface of Titanium Alloy by Wide-Band Laser Cladding
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作者 LIUQi-bin ZOULong-jiang +2 位作者 ZHUWei-dong LIHai-tao DONGChuang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2004年第6期57-62,共6页
The gradient bioceramic coating was prepared on the surface of titanium alloy using wide-band laser cladding.The dynamics of gradient bioceramic composite coating containing hydroxyapatite(HA)prepared with mixture of ... The gradient bioceramic coating was prepared on the surface of titanium alloy using wide-band laser cladding.The dynamics of gradient bioceramic composite coating containing hydroxyapatite(HA)prepared with mixture of CaHPO4·2H2O and CaCO3 under the condition of wide-band laser was studied theoretically.The corresponding mathematical model and its numerical solution were presented.The examination experiment showed that HA bioceramic composite coatings can be obtained by appropriately choosing wide-band laser cladding parameters.The microstructure and surface morphology of HA bioceramic coating were observed by SEM and X-ray diffraction.The experimental results showed that the bioceramic coating is composed of HA,β-TCP,CaO,CaTiO3 and TiO2.The surface of bioceramic coating takes coral-shaped structure or short-rod piled structure,which helps osteoblast grow into bioceramic and improves the biocompatibility. 展开更多
关键词 wide-band laser cladding BIOCERAMIC composite coating DYNAMICS
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AN EFFICIENT IMPLEMENTATION ARCHITECTURE FOR WIDE-BAND DIGITAL DOWNCONVERSION
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作者 Gao Zhicheng Xiao Xianci (University of Electronic Science and Technology of China, Chengdu 610054) 《Journal of Electronics(China)》 2001年第1期38-45,共8页
The wide-band digital receiving systems require digital downconversion(DDC) with high data rate and short tuning time in order to intercept the narrow-band signals within broad tuning bandwidth. But these requirements... The wide-band digital receiving systems require digital downconversion(DDC) with high data rate and short tuning time in order to intercept the narrow-band signals within broad tuning bandwidth. But these requirements can not be met by the commercial DDC. In this paper an efficient implementation architecture is presented. It combines the flexibility of DFT tuning with the efficiency of the polyphase filter bank decomposition. By first decimating the data prior to filtering and mixing, this architecture gives a better solution to the mismatch between the lower hardware speed and high data rate. The computer simulations show the feasibility of this processing architecture. 展开更多
关键词 DIGITAL DOWNCONVERSION wide-band DIGITAL receiving POLYPHASE FILTER
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Comparative Analysis on Antenna Balun and Feeding Techniques of Step Constant Tapered Slot Antenna
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作者 Mousumi Aktar Md. Masud Rana +1 位作者 Nayan Sarker Md. Sanwar Hossain 《Journal of Sensor Technology》 2020年第3期31-45,共15页
This paper represents the performance analysis of the different shapes of antenna balun and feeding techniques for step constant tapered slot antenna. This work also addresses the benefits of antenna balun (circular a... This paper represents the performance analysis of the different shapes of antenna balun and feeding techniques for step constant tapered slot antenna. This work also addresses the benefits of antenna balun (circular and rectangular) along with two types of feeding techniques (Microstrip line L-shape and Microstrip line I-shape). The performance of the antenna for each technique is thoroughly investigated using Computer Simulation Technology (CST) Microwave Studio software simulation under the resonant frequency of 5.9 GHz. Results demonstrate that the proposed model is an effective tool for improving antenna performance. Moreover, an extensive comparison has been carried out between the two different shapes, with and without antenna balun and between two feeding techniques focusing on return losses, gain, directivity, and voltage standing wave ratio (VSWR). 展开更多
关键词 Antenna balun L-Shape Microstrip Feeding I-Shape Microstrip Feeding Return Loss Gain Radiation Pattern DIRECTIVITY CST Microwave Studio
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Bandwidth-enhanced dual-polarized antenna with improved broadband integrated balun and distributed parasitic element
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作者 Fu Suidao Cao Zhenxin +2 位作者 Gao Di Chen Peng Xu Changzhi 《Journal of Southeast University(English Edition)》 EI CAS 2020年第4期367-375,共9页
A bandwidth-enhanced dual-polarized antenna is proposed for 2/3/4/5G applications,which is composed of distributed parasitic elements(DPEs),a main radiator,two improved broadband integrated baluns and a reflector.Firs... A bandwidth-enhanced dual-polarized antenna is proposed for 2/3/4/5G applications,which is composed of distributed parasitic elements(DPEs),a main radiator,two improved broadband integrated baluns and a reflector.First,a novel tooth-shape shorted slot line in the improved broadband integrated balun is analyzed to adjust the input impedance of the antenna.Then,DPEs with 2×2 circular plates loading over the main radiator are proposed to improve broadband impedance matching and radiation pattern.By utilizing impedance compensation of the tooth-shaped shorted slot line and the electromagnetic induction of the DPEs,the antenna achieves an enhanced impedance bandwidth and a stable radiation pattern.To verify these ideas,the bandwidth-enhanced dual-polarized antenna was fabricated and measured.The experimental results indicate that the proposed antenna achieves an operating bandwidth of 72.2%(1.69 to 3.60 GHz)with a return loss(RL)less than-15 dB and a port-to-port isolation(ISO)larger than 30 dB.The antenna obtains a half-power beamwidth(HPBW)within(66±5)°and a gain within(9.0±0.6)dBi in the 2/3/4G bands,and an HPBW within(61.5±2.5)°and a gain within(9.8±0.3)dBi in the 5G band.Across the whole band,the cross-polarization discrimination(XPD)and the front-to-back ratio are both larger than 20 dB. 展开更多
关键词 dual-polarized antenna bandwidth enhancement integrated balun distributed parasitic elements impedance matching
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Genetic algorithm-based wide-band deterministic maximum likelihood direction finding algorithm
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作者 李福昌 赵春晖 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2005年第3期510-514,共5页
The wide-band direction finding is one of hit and difficult task in array signal processing. This paper generalizes narrow-band deterministic maximum likelihood direction finding algorithm to the wideband case, and so... The wide-band direction finding is one of hit and difficult task in array signal processing. This paper generalizes narrow-band deterministic maximum likelihood direction finding algorithm to the wideband case, and so constructions an object function, then utilizes genetic algorithm for nonlinear global optimization. Direction of arrival is estimated without preprocessing of array data and so the algorithm eliminates the effect of pre-estimate on the final estimation. The algorithm is applied on uniform linear array and extensive simulation results prove the efficacy of the algorithm. In the process of simulation, we obtain the relation between estimation error and parameters of genetic algorithm. 展开更多
关键词 wide-band direction finding deterministic maximum likelihood genetic algorithm.
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2-D SPATIAL-SPECTRUM ESTIMATION FORWIDE-BAND SOURCES BASED ON INTERPOLATED CIRCULAR ARRAYS
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作者 Li Ping’an Yu Bianzhang Sun Jincai(Department of Electronic Engineering, Northwestern Polytechnicaj University, Xi’an 710072) 《Journal of Electronics(China)》 1996年第4期319-324,共6页
In array signal processing, 2-D spatial-spectrum estimation is required to determine DOA of multiple signals. The circular array of sensors is found to possess several nice properties for DOA estimation of wide-band s... In array signal processing, 2-D spatial-spectrum estimation is required to determine DOA of multiple signals. The circular array of sensors is found to possess several nice properties for DOA estimation of wide-band sources. C. U. Padmini, et al.(1994) had suggested that the frequency-direction ambiguity in azimuth estimation of wide-baud signals received by a uniform linear array (ULA) can be avoided by using a circular array, even without the use of any delay elements. In 2-D spatial-spectrum estimation for wide-band signals, the authors find that it is impossible to avoid the ambiguity in source frequency-elevation angle pairs using a circular array. In this paper, interpolated circular arrays are used to perform 2-D spatial-spectrum estimation for wide-band sources. In the estimation, a large aperture circular array (Υ】λmin/2) is found to possess superior resolution capability and robustness. 展开更多
关键词 ARRAY SIGNAL processing 2-D spatial-spectrum estimation wide-band SIGNAL Interpolated CIRCULAR ARRAY
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Performance of multi-band orthogonal frequency division multiplexing ultra wide-band system on IEEE UWB channels
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作者 王纯 《Journal of Chongqing University》 CAS 2007年第1期63-66,共4页
Multiband orthogonal frequency division multiplexing (MB-OFDM) ultra wide-band (UWB) is a novel wireless communication technology. It has many advantages and is being actively researhed. In this study, we constructed ... Multiband orthogonal frequency division multiplexing (MB-OFDM) ultra wide-band (UWB) is a novel wireless communication technology. It has many advantages and is being actively researhed. In this study, we constructed and implemented a simulation model of UWB communication systems in Simulink. We found the MB-OFDM UWB system has the best performance in distance between 4 m to 10 m without the line-of-sight requirement. 展开更多
关键词 ultra wide-band (UWB) multiband (MB) orthogonal frequency division multiplexing (OFDM)
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Planar Compact Dual-Band Coupled-Line Balun with High Isolation
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作者 Weiwei Zhang Yongle Wu +1 位作者 Weimin Wang Xiaochuan Shen 《China Communications》 SCIE CSCD 2017年第2期40-48,共9页
A planar circuit structure, which is based on three cascaded pairs of coupled lines, an open stub, and an isolation resistor, is proposed in this paper to design a compact dual.band balun with high isolation. This cir... A planar circuit structure, which is based on three cascaded pairs of coupled lines, an open stub, and an isolation resistor, is proposed in this paper to design a compact dual.band balun with high isolation. This circuit features equal power division with out of phase, all ports matching, high isolation between two outputs, compact structure, and inherent impedance transformation. The closedform design equations are derived based on the traditional transmission.line theory and even.(odd.) mode analysis. A practical dual.band balun, which operates at 0.9/1.8GHz, is designed and fabricated to validate the function of equal power division with out of phase and high isolation between two outputs. The consistency between the simulated and measured results verify the design theory. 展开更多
关键词 balun dual band coupled line high isolation
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A BALUN-BANDPASS FILTER WITH GOOD IN-BAND PERFORMANCE AND WIDE STOPBAND
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作者 Wang Hui Kang Wei +1 位作者 Tan Chen Wu Wen 《Journal of Electronics(China)》 2012年第5期456-460,共5页
A high performance Balun BandPass Filter (BPF) with capacitively loaded multiple coupled lines with very simple structure is proposed in this paper, this structure realizes simultaneous size reduction and superior har... A high performance Balun BandPass Filter (BPF) with capacitively loaded multiple coupled lines with very simple structure is proposed in this paper, this structure realizes simultaneous size reduction and superior harmonic response suppression performance in bandpass filtering meanwhile good differential performance of the Balun. The theory of this structure for unbalanced input into balanced output has been studied in this paper and a proper Balun and BPF characteristic by the symmetric feeding and skew symmetric feeding have been obtained to prove the theory. The enter frequency of the fabricated Balun-BPF is operated at 2.45 GHz with 6.93% Fractional Band Width (FBW), and this frequency is used for Bluetooth and some other communication systems. The differences between the two outputs are 180°± 1.92° in phase and within 0.33 dB in magnitude. At f0, the amplitude imbalance and phase difference are within 0.25 dB and 180.86°, respectively. The measured frequency responses agree well with the simulated ones. With the theoretical analyses and practical results, it is shown that the proposed one has the advantages of simple structure, convenient analysis and good performance of both BPF and Balun. 展开更多
关键词 balun BandPass Filter (BPF) Spurious suppression Good differential performance
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Measurements of Balun and Gap Effects in a Dipole Antenna
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作者 Constantinos Votis Vasilis Christofilakis Panos Kostarakis 《International Journal of Communications, Network and System Sciences》 2010年第5期434-440,共7页
In the present paper, design and analysis of a 2.4 GHz printed dipole antenna for wireless communication applications are presented. Measurements on return loss and radiation pattern of this antenna configuration are ... In the present paper, design and analysis of a 2.4 GHz printed dipole antenna for wireless communication applications are presented. Measurements on return loss and radiation pattern of this antenna configuration are included in this investigation. The printed dipole is combined with the feeding structure of a microstrip via-hole balun and is fabricated on an FR-4 printed-circuit-board substrate. Two inevitable discontinuities are introduced by this antenna architecture in the form of right-angle bends in the microstrip feed line and in the dipole’s gap, respectively. The impact of mitering these bends in the reflection coefficient, resonance bandwidth and radiation pattern of antenna has been investigated by means of simulation and experiment. 展开更多
关键词 PRINTED DIPOLE Integrated balun S-PARAMETERS RADIATION PATTERN
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基于LTCC技术的小型化Marchand Balun设计
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作者 秦舒 《电子工业专用设备》 2013年第10期39-42,共4页
在对巴伦的基本原理和耦合传输线奇偶模阻抗特性研究的基础上,基于LTCC技术设计了中心频率为1.35GHz的小型化MarchandBalun。设计中使用宽边耦合带状线来实现MarchandBalun内部的耦合区段。仿真结果表明,MarchandBalun的中心频率为1... 在对巴伦的基本原理和耦合传输线奇偶模阻抗特性研究的基础上,基于LTCC技术设计了中心频率为1.35GHz的小型化MarchandBalun。设计中使用宽边耦合带状线来实现MarchandBalun内部的耦合区段。仿真结果表明,MarchandBalun的中心频率为1.35GHz,S11为.31.39dB;带内插入损耗在-0.55~1.12dB之间,满足设计指标的要求。 展开更多
关键词 低温共烧陶瓷 Marchand巴伦 小型化设计
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