一种新型高次模铁氧体移相器原理与设计

所讨论的TE01模铁氧体移相器是一种将圆波导TE01模模式特性与铁氧体非互易特性相结合,创新性提出的新型铁氧体移相器。该移相器主要针对毫米波常规铁氧体器件样品尺寸过小难以加工、高频高功率真空器件高次模输出缺少相应的无源器件实现馈线功能等现实技术需求而提出。在对器件的移相特性、传输匹配、高次模抑制及材料加工等诸多环节进行仿真分析、工艺探索等研究后,最终制作了样品,并对其进行了测试,样品在33~34GHz频率范围内移相量达到190°,证明了在高次模传输条件下构造铁氧体移相器的可行性。     

一种基于CPLD的闭锁式铁氧体移相器驱动电路

基于闭锁式铁氧体移相器的工作原理,采用市售集成电路芯片作为组件,设计制作了一种闭锁式铁氧体移相器驱动电路。该电路以复杂可编程逻辑器件(CPLD)作为控制核心,辅以功率器件和其他器件构成外围,具有结构简单灵活、实物易于实现的特点。通过电路实物组装并对其进行测试,得到的驱动电流波形验证了其功能的实现。     

计及信号与电能同步传输影响的ICPT系统谐振参数优化方法

针对信号与电能同步传输的感应耦合电能传输(ICPT)系统中信号耦合线圈对电能传输效率影响的问题,基于LCLP型ICPT系统谐振拓扑结构,利用在原、副边增设耦合线圈对信号进行加载和拾取,实现了信号与电能的同步传输;通过分析原、副边电流的关系,利用耦合变压器、信号发射耦合线圈和信号接收耦合线圈的互感反射阻抗,建立了信号耦合线圈与电能传输效率之间相关联的非线性规划模型,分析了信号耦合线圈对传输效率的影响,给出了相对应的电能传输效率目标函数和约束条件,在此基础上利用自适应粒子群优化算法对谐振补偿参数进行优化,并进行了仿真验证。仿真结果表明相较于同类型信号传输方法,优化后的系统信号传输误码率有所降低,电能传输效率有所提高;波特图表明优化后的信号传输电路并未对电能传输造成较大影响,负载处谐波畸变率有所降低。     

Ku波段宽带波束切换开关设计与优化

设计了一种基于四端口差分相移环行器的Ku波段宽带波束开关.针对波束开关在Ku波段获得大于1.5 GHz的带宽的目标,魔T和3 dB电桥采用了多级匹配的原理.考虑到功率、散热和额外的磁路结构,基于H侧加载铁氧体薄板结构设计了π/2差分移相器.然后设计并仿真了Ku波段宽带波束开关的整体性能.仿真结果显示,端口反射小于20 ...     

双芯对称离散型可控移相器对纵联保护的影响分析

晶闸管控制的移相器(Thyristor Controlled Phase Shifter,TCPS)通过调整移相角实现电网潮流分布的控制,可有效改善电网潮流分布,提高电网运行经济性。但移相器的应用改变了电网结构和相间耦合关系,当常规纵联保护直接应用于含有移相器的线路时,需考虑移相因素对差动电流的影响以及采用合适的差动电流计算方法,同时需考虑互感器的安装位置的选取,而纵联方向保护方向元件是否受影响也需要做进一步的分析。针对安装了TCPS的输电线路纵联保护进行了分析和仿真研究,建立了相应的电磁仿真模型,在此基础上分析了互感器安装于不同位置时,常规方向元件、差动元件的动作特性,并提出了几种可能的差动电流计算方法,仿真分析了纵联保护在含移相器线路的适应性。研究表明,移相器的接入对于纵联方向保护的方向元件没有影响,但对常规电流差动保护影响较大,纵联保护应用中宜使用线路侧互感器实现。     

用于全向无线电能传输的两种磁矢量控制方式对比分析

为实现全向无线电能传输,基于二维正交磁耦合机构提出了磁矢量旋转和磁矢量定向的控制方式。首先,采用基波等效分析法(fundamental harmonic approximation, FHA)设计使电压增益可调的LCC/S谐振补偿网络。其次,依据两种控制方式的机理给出激励电流的控制方法,从理论上对比二者传输效率差异同位置的关系。在上述基础上,由Ansys/Maxwell仿真得到两种控制方式的磁场时空特点,并基于空间互感分布的Matlab/Simulink仿真模型验证了两种控制方式的可行性。最后,搭建一台实验样机对理论分析进行验证,测得样机的传输效率的空间分布。仿真和实验结果表明：所提控制方式均可应用于正交磁耦合机构实现全向无线电能传输,磁矢量定向效率优于磁矢量旋转,平均效率提升了33.18%。     

强激光脉冲电源远控装置的电磁兼容设计

为保证强电磁干扰环境下微机控制系统的正常工作,对强激光脉冲电源远方控制装置进行了电磁兼容性设计。基于PSPICE软件建立了仿真模型,从电源供电回路、控制信号输出通道、通讯网络、接地及屏蔽等方面研究了有关的电磁兼容性问题,并针对调试中的问题改进了设计。仿真和现场试验表明,该设计可以有效减少经由共阻抗耦合、供电电源耦合以及空间电磁辐射耦合途径传输的电磁干扰,远方微机控制装置工作正常。     

电动汽车动态无线充电紧—强耦合模式分析

针对感应耦合结构近距离、弱偏移,以及谐振耦合式结构易受干扰的问题,提出紧—强耦合协同工作机构。通过建立动态无线充电系统的数学模型,研究其传输特性随品质因数和耦合系数的变化规律。基于有限元仿真,分析了系统的动态传输特性。为提高系统的抗偏移性、降低电磁辐射,在接收线圈装设铁氧体屏蔽结构。通过搭建实验平台对仿真过程进行实验验证,证明了所设计耦合机构的可行性。结果表明所设计的耦合机构具有较高的动态传输性能,并且在85kHz下获得了93.9%的传输效率。     

多负载多线圈无线电能传输系统各路输出的 恒压特性设计

在多负载多线圈无线电能传输系统中,非期望耦合线圈之间的磁场交叉耦合导致系统建模复杂以及各路负载恒压设计难以实现。为此,本文提出多层结构的隔离方案以实现非期望耦合线圈间的磁交叉去耦,基于此,给出多路负载无源恒压输出设计。在磁交叉去耦方案中,采用三层结构(铁氧体-铝-铁氧体)的隔离方案对同轴线圈的非期望耦合进行去耦,采用双层结构(铁氧体-铝)实现对非同轴线圈的磁交叉去耦。把所提的磁交叉去耦方案应用到一个三负载六线圈的级联式无线电能传输系统中,系统中非期望耦合线圈间的互感降低至小于原来的6%,而期望耦合线圈间的互感得到一定提升。进一步利用T参数矩阵法设计出无源补偿网络,实现各路负载恒压特性。最后实验结果表明,各路负载在10～100Ω的变化范围内负载的最大电压偏差不超过其设计值的9.3%。     

基于带状线腔法测试铁磁共振线宽的设计与仿真

基于谐振腔微扰理论及铁磁共振线宽定义,给出了一种两端开路的可调带状线腔测试圆片型微波铁氧体材料铁磁共振线宽的方法,并用HFSS仿真软件验证该方法的可行性。根据带状线腔的基本理论和测试频率的要求,通过计算和仿真确定腔体的尺寸和耦合方式,并根据测试原理确定样品的加载方式。仿真验证过程中,通过找到铁磁共振点,以及偏离共振磁场处?H/2的谐振点S21的值判断仿真误差,从而验证装置的可行性。仿真结果表明该方法可用于在1 GHz频率下实验室通过压片制得的圆片型微波铁氧体材料的线宽测试,进而实现材料的简化加工。     

Shortened directional coupler using slow wave structure of periodically loaded capacitance and inductance

This paper proposes an analytically based approach for the design of a length‐reduced directional coupler. This method of reduction is realizing the directional coupler's impedance transformers by using slow wave structures. These slow wave structures are designed by transmission lines periodically loading both shunt capacitances and series inductances. Loaded capacitance is realized by stub shunt capacitance on the top layer; at the same time, loaded inductance is realized by electromagnetic band gap structure on ground. Increasing parallel capacitance and series inductance can reduce the phase velocity of the propagating waves and hence engender higher electric lengths using smaller physical lengths. A directional coupler is designed using this slow wave structure, and the performance of coupling is analyzed with the generalized coupled‐mode theory. The design methodology is validated with the design of a length‐reduced directional coupler at 0.7 GHz. An approximate length reduction of 54% is achieved with this technique compared with the conventional directional coupler. The electromagnetic simulation and experimental results validate the proposed approach. Copyright © 2015 John Wiley & Sons, Ltd.     

RF MEMS移相器馈电网络的研究

提出一种RF MEMS移相器馈电结构的设计,在MEMS开关中加入MAM电容。MEMS移相器金属桥开关的馈电可以通过MAM电容,空气桥和偏置线来实现的。通过这种方法,不但实现了数字式控制,而且引入相对稳定的电容值,改善了开态和关态的电容比,提高了MEMS移相器的性能。     

Reflection-Type Ferroelectric Phase Shifter With Defected Ground Structure

In order to obtain a low-loss ferroelectric phase shifter, we were designed and fabricated the reflection-type ferroelectric phase shifter with the defected ground structure (DGS) resonators. The ferroelectric phase shifter is consisted of a 3-dB 90° branch-line hybrid coupler and terminated reflective circuit with tunable ferroelectric DGS resonator which can provide a high Q resonator characteristic at high frequencies. The design parameters of equivalent circuit for the tunable DGS resonator are derived by circuit analysis method and three-dimensional full wave finite element method. At 13.5 GHz, the fabricated phase shifter exhibited an insertion loss of better than 3.4 dB.     

铁氧体移相器逐次通量反馈相位补偿技术

铁氧体移相器是相控阵雷达的关键元件,采用有效的相位补偿技术,提高铁氧体移相器的移相精度,是一个重要的研究课题。依据移相器相位与铁氧体材料剩磁状态的相关性,通过分析材料内应力对材料剩磁状态的影响,针对传统移相器采用的瞬时能量反馈技术对相位补偿不足的问题,提出了逐次通量反馈技术。探讨在高功率条件下,减小材料内应力对材料剩磁状态所带来的影响,提出提高电控铁氧体移相器相位稳定性的技术途径和手段,实验结果证明了此技术的可行性。     

Scaling the modulation bandwidth and phase efficiency of a silicon optical modulator

We present an optimized design and detailed simulation of an all-silicon optical modulator based on a silicon waveguide phase shifter containing a metal-oxide-semiconductor (MOS) capacitor. Based on a fully vectorial Maxwell mode solver, we analyze the modal characteristics of the silicon waveguide. We show that shrinking the waveguide size and reducing gate oxide thickness significantly enhances the phase modulation efficiency because of the optical field enhancement in the voltage induced charge layers of the MOS capacitor, which, in turn, induce refractive index modulation in silicon due to free carrier dispersion effects. We also analyze the device speed by transient semiconductor device modeling. As both optical absorption and modulation bandwidth increase with increasing doping concentration, we show that, with a nonuniform doping profile in the waveguide, balance between the device operation speed and optical loss can be realized. Our simulation suggests that a TE-polarized optical phase modulator with a bandwidth of 10 GHz and an on-chip optical loss less than 2 dB is achievable in silicon.     

铁氧体移相器差相移一致性浅析

以X波段背脊式非互易移相器为研究对象,从磁芯、应力、激励器等多方面对影响铁氧体移相器差相移一致性的因素进行了分析和讨论.为了使这种一致性达到要求,在移相器的设计、加工、装配等过程中,首先力求将各种不利因素的影响程度降到最低;然后采用数理统计等方法对同批移相器的差相移进行统计和分析,淘汰不合格品.     

永磁无刷直流电机的电磁耦合器优化控制研究

永磁无刷直流电机的电磁耦合器是实现感应电能传输的重要器件,通过对电磁耦合器的优化控制设计,提高电磁耦合器的稳定性和输出增益。提出一种基于优化粒子群算法的电磁耦合器优化控制方法,首先进行了永磁无刷直流电机的电磁耦合器的等效电路设计,构建电磁耦合器控制的约束参量模型,以输出电压增益、功率损耗与效率为约束参量构建控制目标函数,实现控制算法的改进,进行了永磁无刷直流电机的电磁耦合器的优化设计。仿真实验结果表明,能有效提高永磁无刷直流电机的电磁耦合的输出稳定性,电机输出的电流增益、电压增益与输出效率高于传统方法,展示了较好的应用价值。     

Coordinated Design of Power System Stabilizers and Static Phase Shifters Using Genetic Algorithm

Coordinated design of a power system stabilizer (PSS) and a static phase shifter (SPS) using genetic algorithm (GA) is investigated in this paper. The design problem of PSS and SPS controller is formulated as an optimization problem. An eigenvalue-based objective function to increase the system damping is proposed. Then, GA is employed to search for optimal controller parameters. Different control schemes have been proposed and tested on a weakly connected power system with different disturbances, loading conditions, and parameter variations. It was observed that although the PSS enhances the power system stability, the SPS controller provides most of the damping and improves the voltage profile of the system. The nonlinear simulation results show the effectiveness and robustness of the proposed control schemes over a wide range of loading conditions and system parameter variations.     

一种L波段天线合成网络的研制

针对实际工艺中使用微带线耦合器在实现高耦合系数时寄生参数较大、且工艺实现较为困难的问题,采用带状线耦合器与微带线耦合器相结合的设计方法,结合ADS仿真软件,实现了具有高幅度和相位精度、低插入损耗的合成网络,解决了高耦合系数与大寄生参数间的矛盾及加工困难的问题。     

Optimum Reflection-Type Phase Shifter Using (Ba,Sr)TiO3 Thin Film

In this paper, in order to obtain a large differential phase shift with a little change in applied voltage, a ferroelectric reflective load circuit has been designed on top of barium strontium titanate (Ba,Sr)TiO₃ [BST] thin film. The design of the ferroelectric reflection-type phase shifter is based on a reflection theory of terminating circuit, which has a reflection-type analogue phase shifter with two ports terminated in symmetric phase-controllable reflective networks. To achieve large amounts of phase shift in low bias-voltage range, the effects of change of capacitance and transmission line connected with two coupled ports of a 3-dB 90° branch-line hybrid coupler have been investigated. A large phase shift with a small capacitance change in the parallel terminating circuit has been demonstrated in the paper.