Spin Supercurrent in Phenomena of Quantum Non-Locality (Quantum Correlations, Magnetic Vector Potential) and in Near-Field Antenna Effect

It is shown that such phenomena as quantum correlations (interaction of space-separated quantum entities), the action of magnetic vector potential on quantum entities in the absence of magnetic field, and near-field antenna effect (the existence of superluminally propagating electromagnetic fields) may be explained by action of spin supercurrents. In case of quantum correlations between quantum entities, spin supercurrent emerges between virtual particles pairs (virtual photons) created by those quantum entities. The explanation of magnetic vector potential and near-field antenna effect is based on contemporary principle of quantum mechanics: the physical vacuum is not an empty space but the ground state of the field consisting of quantum harmonic oscillators (QHOs) characterized by zero-point energy. Using the properties of the oscillators and spin supercurrent, it is proved that magnetic vector potential is proportional to the moment causing the orientation of spin of QHO along the direction of magnetic field. The near-field antenna effect is supposed to take place as a result of action of spin supercurrent causing secondary electromagnetic oscillations. In this way, the electromagnetic field may spread at the speed of spin supercurrent. As spin supercurrent is an inertia free process, its speed may be greater than that of light, which does not contradict postulates of special relativity that sets limits to the speed of inertial systems only.

Confinement and antenna effect for ultrasmall Y_(2)O_(3):Eu^(3+) nanocrystals supported by MOF with enhanced near-UV light absorption thereby enhanced luminescence and excellently multifunctional applications

A novel host-guest luminous system with enhanced near-UV light absorption thereby enhanced luminescence are designed based on the synergism of quantum confinement,spatial confinement,and antenna effect,where ultrasmall Y_(2)O_(3):Eu^(3+)nanocrystals are fixed inside MOF(Eu/Y-BTC)as supporting structure.The Eu/Y-BTC not only limits the size and leads to lattice distortion of Y_(2)O_(3):Eu^(3+)nanocrystals and controls the distance between nanocrystals,but also promotes the light absorption and emission.The significantly red-shifted and broadened charge transfer band of Y_(2)O_(3):Eu^(3+)/(Eu/Y-BTC)leads to the excellent applications of Y_(2)O_(3):Eu^(3+)in white light-emitting diodes(LEDs).Our results show that white light with superior color quality(CRI>90)and extremely high luminous efficacy(an LER of 335 lm/W)could be achieved using Y_(2)O_(3):Eu^(3+)/(Eu/Y-BTC)as red phosphor.The Y_(2)O_(3):Eu^(3+)/(Eu/Y-BTC)also improves the photoelectric performance of dye-sensitized solar cells(DSSCs),not only because Y_(2)O_(3):Eu^(3+)/(Eu/Y-BTC)has a large specific surface area and the adsorption amount of the dye is increased,but also because the valence band position of Y_(2)O_(3):Eu^(3+)/(Eu/Y-BTC)is 2.41 eV,which can provide an additional energy level between the TiO2 and dye,promoting electron transfer.For these advantageous features,the multifunctional Y_(2)O_(3):Eu^(3+)/(Eu/Y-BTC)composite product will open new avenues in white LEDs and DSSCs.

Effect of Facet Displacement on Radiation Field and Its Application for Panel Adjustment of Large Reflector Antenna

Large reflector antennas are widely used in radars, satellite communication, radio astronomy, and so on. The rapid developments in these fields have created demands for development of better performance and higher surface accuracy. However, low accuracy and low effi- ciency are the common disadvantages for traditional panel alignment and adjustment. In order to improve the surface accuracy of large reflector antenna, a new method is pre- sented to determinate panel adjustment values from far field pattern. Based on the method of Physical Optics （PO）, the effect of panel facet displacement on radiation field value is derived. Then the linear system is constructed between panel adjustment vector and far field pattern. Using the method of Singular Value Decomposition （SVD）, the adjustment value for all panel adjustors are obtained by solving the linear equations. An experiment is conducted on a 3.7 m reflector antenna with 12 segmented panels. The results of simulation and test are similar, which shows that the presented method is feasible. Moreover, thediscussion about validation shows that the method can be used for many cases of reflector shape. The proposed research provides the instruction to adjust surface panels efficiently and accurately.

Predicting Ground Effects of Omnidirectional Antennas in Wireless Sensor Networks

Omnidirectional antennas are often used for radio frequency (RF) communication in wireless sensor networks (WSNs). Outside noise, electromagnetic interference (EMI), overloaded network traffic, large obstacles (vegetation and buildings), terrain and atmospheric composition, along with climate patterns can degrade signal quality in the form of data packet loss or reduced RF communication range. This paper explores the RF range reduction properties of a particular WSN designed to operate in agricultural crop fields to collect aggregate data composed of subsurface soil moisture and soil temperature. Our study, using simulation, anechoic and field measurements shows that the effect of antenna placement close to the ground (within 10 cm) signi?cantly changes the omnidirectional transmission pattern. We then develop and propose a prediction method that is more precise than current practices of using the Friis and Fresnel equations. Our prediction method takes into account environmental properties for RF communication range based on the height of nodes and gateways.

甚低频声波介导纵向谐振式磁电天线通信研究

基于声波谐振的磁电天线(Magnetic Electric Antenna, MEA),利用复合材料间的高耦合效应,在共振频率下,产生高效的磁场辐射能力,实现低频电磁波发射。提出声波介导对称式纵向谐振式甚低频磁电天线,建立ME天线等效电路模型,依据牛顿第二定律和安培定律引入参数压电体积分数,建立包含工作损耗的动力学模型和辐射场模型,并设计低频通信试验系统。试验结果表明,压电体积分数n=0.66时,ME天线辐射磁感应强度增大1.7倍,通信距离提升120%。在同等尺寸下,比电小天线辐射效率提升3个数量级,通过5 bps的FSK调制,实现低频下的可靠通信,验证了ME天线在低频电磁通信的优越性。

油气管道VSAT卫星链路计算方法研究

为了解决VSAT卫星链路完全依靠卫星厂家进行计算且无法核对厂家提供的数据是否正确的问题,针对VSAT卫星链路计算的可靠性和健壮性,提出了一种油气管道VSAT卫星链路计算方法。该方法采用“功带平衡”算法,将VSAT卫星链路的带宽占用比等同于功率占用比,计算出卫星转发器最大输出功率,进而计算等效功率密度,根据每载波占用卫星的ERIP值公式,计算出饱和通量密度,匹配出卫星天线尺寸及功放矩阵,根据匹配的卫星天线及功放计算VSAT卫星链路总载噪比,将VSAT卫星链路总载噪比和系统最低载噪比进行对比,VSAT卫星链路总载噪比大者为合适的卫星天线及功放,反之为不合适选项,用推算出的卫星天线及功放推算出功率占用比,功率占用比与带宽占用比差别较大时,需调整卫星天线及功放的选择,计算功率占用比,直到卫星天线及功放达到功率占用比等于带宽占用比,即为最优的卫星天线和功放。通过最终的计算可得出卫星天线与功放的匹配矩阵,在实际工程中需从中选取合适的卫星天线与功放中的最小值达到最经济、可靠的匹配。该计算方法通过软件编程进行了界面可视化显示,并在诸多工程中进行了详细验证,结果表明此方法准确可靠,很好地提升了VSAT卫星链路计算的可靠性和健壮性。

非共轭聚合物点和Eu^(3+)的比率荧光传感器检测牛奶中的四环素

四环素(TC)因其广谱抗菌活性和低廉的价格被广泛应用于畜牧养殖业治疗及预防相关细菌感染,因其难以代谢而残留在动物源性食品中,影响人类健康,因此建立方便快捷的TC检测方法至关重要。本文以高支化聚乙烯亚胺(PEI)和抗坏血酸(AA)为原料,合成了一种水溶性良好且具有高稳定性蓝绿色荧光的非共轭聚合物点(NCPDs),其通过与Eu^(3+)和柠檬酸三钠的简单混合构建了检测TC含量的比率荧光探针。TC既可以通过内滤效应淬灭NCPDs在490 nm处的蓝绿色荧光,也可以通过Eu^(3+)的天线效应增敏Eu^(3+)在618 nm处的红色荧光。二者荧光强度的比值与TC的含量具有良好的线性关系。该方法具有快速的荧光响应,较宽的线性范围50.0 nmol/L~80.0μmol/L和较低的检出限11.8 nmol/L,并且该比率荧光传感器成功地测定了牛奶样品中的TC。

振动永磁式机械天线的动力学特性研究

在传统的无线通信领域中,长波通信需要匹配大尺寸信号发射天线,制约了其在中小型平台上的应用。基于逆压电效应、振动理论和麦克斯韦方程组,提出并研制了一种三自由度折返梁结构的振动永磁式机械天线原理样机,建立了电-机械-电磁能理论模型,研究了机械天线的辐射影响因素及其频率调制技术。实验结果表明,通过激发机械天线原理样机的不同振动模态可对电磁波信号进行频率调制,从理论和技术角度为低频段信号的通信提供了新思路。

基于崎岖度法的调频场强计算与测量分析

本文基于“崎岖度法”理论,详细阐述了调频覆盖场强的计算方法,包括有效辐射功率、天馈线增益、天线有效高度、地形衰减校正系数的计算方法以及接收天线的补偿计算。通过实例计算并与测量数据进行比较,本文深入分析了接收点地形和菲涅尔区等因素对实测结果的影响。

悬空调频发射系统天线的研究

本文深入研究了悬空调频发射系统的设计与应用。文章对常见的调频天线类型进行了全面的分析与评估,确定了最适合悬空调频发射系统的天线形式,并对不同电气参数和安装方式下的覆盖效果进行了仿真计算。本文的研究成果为调频广播覆盖提供了多角度的解决方案,具有重要的理论与实践意义。

基于有源匹配技术的EMC测试天线设计与实现

针对低频段无源小型化EMC(Electromagnetic Compatibility)测试天线多为电小天线导致的天线系数高以及测试灵敏度低的问题,文中基于有源匹配技术分别对加载负阻变换电路和场效应管高阻输入电路的电小天线进行仿真分析。结果表明,场效应管高阻输入电路在降低天线系数和电路稳定性方面均优于负阻变换电路,有助于EMC测试天线的小型化设计和实现。加载场效应管高阻输入匹配电路的小型化EMC测试天线的测试结果表明,在2~30 MHz频带内,与未加载场效应管高阻输入匹配电路的EMC测试天线相比,该天线系数改善可达22~46 dB。

针对无人机防御的卫星导航干扰方法研究

针对日益增多的恶性无人机“黑飞”现象,并考虑到其卫星导航终端会装载多阵元自适应调零抗干扰天线以提高导航资源使用能力,分析了采用卫星导航干扰进行无人机防御的优点,探索出一种针对无人机防御的卫星导航干扰方法.阐述从单干扰源到多干扰源的导航干扰实施策略,并给出了评估指标.本文研究有助于帮助防护人员准确探索有效防御边界,判断薄弱区域,优化干扰源部署策略,提高防护效率.同时,开发了一款防御效果评估软件,其可呈现防御态势,使得防御效果显示更加直观.

一种基于工程化气动加热算法的天线热防护设计

高超音速气动热仿真技术是提高天线热防护能力的重要支撑之一,为了进一步缩短研制周期和节约成本,本文提出了一种以冷壁热流和壁面恢复焓为输入条件,以MATLAB和CFD联合迭代快速求解高速气流中天线温度场的工程化算法。在利用气动热试验证明仿真结果与实验数据的高一致性后,以该仿真方法对一个高速气动加热时长为500 s的天线实施了防隔热优化设计,根据仿真评估出的导致核心器件温升的主、次要因素,针对性地提出改进措施,最终目标印制板由过往的320℃下降到了142℃,热控效果显著。

X波段接收机强电磁脉冲的毁伤效应

为解决低轨道侦察卫星的侦察行动使战场丧失隐蔽性的问题,采用电磁脉冲攻击卫星接收机的毁伤方法,利用电磁仿真软件CST、电路仿真软件ADS对电子目标进行建模,进行电磁脉冲辐照模拟试验。结果表明,高功率微波发射源以30 GW的发射功率、70 dB的发射增益,在距离目标400 km处,可造成接收机设备部分器件损毁;若以30 GW的发射功率、90 dB的发射增益、在距离目标400 km处,可造成接收机设备完全损毁。结果验证了电磁脉冲武器攻击低轨道微小卫星接收机方案的可行性。

不同类型干扰信号对BTM应答器天线影响分析

以应答器传输系统通信链路为研究对象,采用场路协同仿真的分析方法,通过全波三维仿真软件搭建了BTM应答器天线的模型,并基于电磁感应原理对天线进行匹配使其达到谐振状态,通过仿真天线的参数验证三维仿真模型的性能;对应答器系统模型进行典型电磁脉冲系统级耦合效应仿真研究,通过雷电、静电及核电磁脉冲三种不同类型脉冲的干扰仿真,探知了不同类型的脉冲干扰产生的不同脉冲时长、频谱分布及电磁能量,以及三种干扰信号对系统传输的影响程度,为列控系统电磁干扰深入研究奠定基础.

天线地网对中波广播发射效果的影响

中波广播作为一种传统信息传播手段,在偏远地区和特定应用场景中发挥着重要作用。然而,中波广播在传播过程中面临着一系列问题,会直接影响广播信号的清晰度和接收质量。基于此,分析天线地网对中波广播发射效果的影响,并提出一系列优化天线地网设计的策略,旨在实现中波广播传播效率的最大化,为偏远地区提供更稳定的广播服务。

超宽带脉冲作用下抗干扰器件的特性分析

基于高重频超宽带脉冲,研究了高重频超宽带脉冲对自适应调零天线和PIN限幅器的抗干扰性能的影响。基于Matlab和ADS仿真软件搭建模型,并通过实验平台对ADS的仿真结果进行验证。实验结果表明:对于导航接收机中的自适应调零天线,超宽带干扰脉冲会使其射频链路产生饱和效应,从而使功率倒置算法失效,进而无法在干扰方向形成零陷;对于PIN限幅器,超宽带干扰脉冲可以使其产生明显的尖峰泄露效应。相较于ns量级的窄谱高功率微波脉冲,超宽带脉冲对限幅器的干扰能力更强。

高压电力传输设备对中波发射台覆盖效果的影响分析

某中波发射台附近拟架设高压电力传输设备,为研究其对中波覆盖效果的影响,开展专题研究。在电磁仿真软件中建立仿真模型,分析不同数量、高度和距离的电力塔对中波天线水平面方向图的影响,最后总结出一般规律,为项目的建设提供参考。

A Study on The Multi-Antenna Geometrical Depolarization Channel Modeling

The traditional geometrical depolarization model that single transmitter to single receiver provides a simple method of polarization channel modeling. It can obtain the geometrical depolarization effect of each path if known the antenna configuration, the polarization field radiation pattern and the spatial distribution of scatters. With the development of communication technology, information transmission spectrum is more and more scarce. The original model provides only a single channel polarization state, so the information will be limited that the polarization state carries in the polarization modulation. The research is so significance that how to carries polarization modulation information by using multi-antenna polarization state. However, the present study shows that have no depolarization effect model for multi-antenna systems. In this paper, we propose a multi-antenna geometrical depolarization model. On the basis of a single antenna to calculate the depolarization effect of the model, and through simulation to analysis the main factors that influence the depolarization effect. This article provides a multi-antenna geometrical depolarization channel modeling that can applied to large-scale array antenna, and to some extent increase the speed of information transmission.

Ergodic Capacity Analysis and Adaptive Transsmion Scheme in Multi-user Distributed Antenna Systems

This paper focuses on analyzing the ergodic capacity performance of limited feedback (LFB) beamforming in multi-user distributed antenna system (DAS). In such a system, multi-user interference (MUI) is inevitably due to the channel uncertainties caused by quantization error. Considering this, we propose a parameter named effective ergodic capacity rate (EECR), which denotes the capacity offset between finite rate feedback and perfect channel state information (CSI). The simulation results show that the derived approximated EECR is very tight to actual EECR. Based on the approximated EECR, an adaptive minimum bit feedback scheme is proposed, which can effectively reduce the overhead of feedback channel and the complexity of the system. The simulation results verify the effectiveness of the proposed scheme.