一种应用于5G的双频微带天线设计

提出了一种可应用于5G无线通信的小型化双频微带天线,该天线采用偏心侧馈和贴片开槽的方式使其具有双频工作特性。首先研究了微带贴片尺寸和贴片上倒L型开槽对天线谐振频率的影响;其次通过在微带贴片的馈点旁增加矩形细缝来调节天线的阻抗匹配特性;最后,利用电磁仿真软件HFSS对所提出的天线的性能进行了仿真与优化,结果表明其两个工作频段可覆盖3.5~3.6GHz和4.8~5.0GHz的5G频段,两个工作频段内的回波损耗最大为23dB,辐射增益分别为2.83dB和4.35dB。     

小型化宽频带PIFA 天线的设计与仿真

针对现代通信系统终端小型化、宽频带的要求,本文提出了一种新型小型化宽频带平面倒F 天线。该天线由 金属地板、辐射贴片、短路贴片和馈电系统四部分组成。其中对地板进行十字缝隙开槽,短路贴片采用短路墙,馈电 系统采用二等分威尔金森功分器。采用HFSS13.0 软件对天线进行仿真,仿真结果表明,该天线在2.01~2.61GHz 频带 范围内驻波比小于2, 阻抗带宽达到26.3%;1.66~2.75GHz 频带范围内增益大于3dBi,增益带宽达到47.4%。同时,天 线的自由空间辐射方向图也满足无线通信终端要求。     

小型宽频带六边形缝隙天线的设计

提出了一种小型宽频带的六边形缝隙天线。通过在接地面的中心位置刻蚀出六边形缝隙并加载和缝隙形状相似的的寄生贴片实现了天线的宽频带。用仿真软件HFSS对天线进行仿真分析,并对天线进行了实际测试。结果表明,所提出的天线的带宽达到了9GHz(3.50~12.50GHz),阻抗相对带宽达到了113%,频带内电压驻波比小于2,阻抗匹配良好,同时,在整个频带内,增益均大于3.5dB,最大增益达到4.5dB,测试结果和仿真结果基本上一致。该天线可应用于宽频带无线通信系统。     

低RCS宽带磁电偶极子贴片天线设计

该文设计了一种低雷达散射截面(RCS)的宽带磁电偶极子贴片天线,其中印刷在介质板上的金属贴片为电偶极子,3个金属过孔连接辐射贴片与金属地板构成磁偶极子。整个天线采用T型渐变馈电结构同时激励电偶极子与磁偶极子,天线的频带范围为7.81~13.65 GHz,覆盖了整个X波段。实测和仿真结果表明,通过在磁电偶极子贴片天线底面采用开槽技术并优化开槽的形状、大小、位置等变量,在天线工作频带范围内实现了RCS的减缩,最大缩减量达到了17.9 dB,同时天线保持了增益稳定不变,E面、H面方向图一致的特性。     

基于RFID的小型天线的设计

915 MHz频段是RFID常用的频段之一,本文设计了一款该频段下工作的RFID天线,并借助ANSOFT HFSS计算软件对天线系统进行了仿真分析,通过对贴片以及接地板开槽,使天线在保持高增益的情况下,在更宽的频带上具有更好的稳定性,同时也减小了天线的尺寸,使天线整体性能更加完善。     

一种2.45GHz频段RFID读写器天线

2.45 GHz频段是RFID常用的频段之一,针对该频段的一款读写器天线进行了详细的分析并进行了改进。借助ANSOFT HFSS 10.0计算软件对天线系统进行了仿真分析,在样本天线的基础上,通过对贴片边缘开槽,使天线在保持高增益的情况下,在更宽的频带上具有更好的稳定性,同时也减小了天线的尺寸,使天线整体性能更加完善。     

一种地面开槽的双频宽频单极子天线

针对无线通信应用,设计了一种双频单极子天线,天线由共面波导馈电。天线的整体尺寸为30 mm×25 mm×0.8 mm,基板选用FR4。天线在平面单极子的基础上,通过在共面波导地平面上开槽,实现了双频特性;同时采用具有渐变结构的单极子贴片,实现了在较宽频带上良好的阻抗匹配。采用HFSS仿真软件对天线进行仿真,仿真结果表明:天线具有单极子天线的辐射特性,天线带宽较宽,在3.01~6.1 GHz反射损耗小于-10 d B,相对带宽达到了67.8%,工作频段覆盖了3.5/5.2/5.5/5.8 GHz频段。天线具有较好的全向辐射方向图和增益,其尺寸小、结构简单和易于加工,能够广泛用于WLAN和WiMAX通信系统中。     

基于平面微带结构超介质天线设计与分析

利用开槽曲流技术构建了一种工作频段位于S、C波段内的多频微带贴片天线,根据传统立体左手材料的变型结构设计了一种新型平面微带结构的超介质。在微带贴片天线的介质基板内加载超介质覆层后,天线工作频率降低,频带展宽以及辐射性能得到改善。HFSS和Matlab仿真实验结果表明,新型平面微带结构的超介质在2.7~4.9GHz和5.0~5.5 GHz两个频段内具有等效介电常数和等效磁导率均小于0的左手特性,工作频率在2.66,3.67,4.66和5.49 GHz的微带贴片天线加载超介质覆层后,其谐振频率分别降低了140,140,210和270 MHz,同时4.60~4.78GHz的工作频带展宽了160 MHz。该超介质微带天线可以运用于实际的WLAN或WIMAX通信中。     

一种新型2.4GHz频段加载贴片天线的设计

采用在贴片上开槽和加载的方法,设计了一种用于2.4GHz频段无线通信设备、内缩渐变线馈电的新型结构贴片天线.给出仿真设计的性能和多个天线样品的实测输入驻波比曲线和远区辐射特性图,详细研究分析了不同加载条件、不同辐射边尺寸对输入驻波比的影响.实测结果表明,该天线在2.4GHz频段上获得超过15%的相对带宽(VSWR<2),而且尺寸比相应频段的微带贴片天线更加微型化.     

一种小型化双频宽带天线设计

提出了一种小型化双频宽带天线,天线结构由基板背面加载矩形贴片和在馈线上刻蚀一段U型槽线组成。天线制作在相对介电常数为4.4的FR4介质基板上。通过三维仿真工具实现了天线的紧凑结构,总尺寸为25 mm×20 mm×0.6 mm。实测天线可以工作在5.8 GHz^11.0 GHz和14.5 GHz^21.5 GHz两个频段,频带内最大增益为4.23 dBi,实测与仿真结果吻合较好。该天线适合于多标准无线通信系统应用。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks