Ka波段30W空间行波管

介绍了未来星际通讯用Ka波段30W空间行波管的最新研究进展。行波管电子枪采用传统的皮尔斯型电子枪,高频结构采用螺旋线慢波结构和品型夹持结构,为了保证较高的收集极效率,采用四级降压收集极。测试结果表明在工作频带内行波管输出功率超过34.6W,总效率超过47.5%。当行波管工作于低频状态时,行波管总效率超过了50%,已达到目前国外同等功率量级Ka波段空间行波管研究水平。     

V波段空间行波管研制

本文介绍了国内外V波段空间行波管研究进展,给出了作者在V波段空间行波管设计和性能测试结果.V波段空间行波管电子枪采用传统皮尔斯型电子枪,高频采用螺旋线结构,为了提高行波管效率,采用四降压收集极.测试结果表明在工作频带内V波段空间行波管连续波饱和输出功率超过20 W,总效率超过21.8％,行波管动态流通率超过98％,在整个工作频带内行波管饱和增益超过了43 dB.     

基于Matlab的ZCS PWM DC/DC变换器的建模及仿真

分析了ZCS PWM DC/DC变换器电路的工作原理,探讨了主要参数的设定,并建立了基于Matlab的仿真模型,通过选择参数对仿真模型和程序进行校核和调试,证明了零电流关断电路可以有效地减小关断损耗,提高工作效率。     

电子枪电极热膨胀量的精密测量方法——电接触法

本文为电子枪电极热膨胀量的精密测量提供了一种新方法——电接触法。通过大功率周期永磁聚焦耦合腔行波管电子枪及大功率速调管电子枪的研制实践证明,本方法简便直观、精确可靠。该方法在电子枪研制中推广应用,可以缩短周期、降低成本。大量实验表明、用本方法测量极间距离热膨胀量的重复测量误差小于0.01毫米(与极间距离无关)。国外对栅控枪热结构曾作过计算机分析,但未给出实用性的结果。本方法的提出,解决了栅控枪的关键之一——阴、栅极间距离热膨胀量的精密测量问题。     

G波段行波管电子枪设计与实验

设计了用于G波段行波管的聚焦极调制皮尔斯电子枪,电子注电压20 kV,电流50.9 mA,注腰半径0.056 mm,射程10.3 mm。利用热-结构耦合分析和电子注轨迹仿真方法,分析了热形变对电子枪性能造成的显著影响。为了消除电子枪热形变的影响,设计了装配模具进行补偿,并得到了实验验证。该电子枪已用于多种G波段行波管,解决了关键部件技术问题。     

三相单管零电流关断功率因数校正器的研究

介绍仅用一个主开关管及一个辅助开关提高设备的输入侧三相交流功率因数的零电流关断（ＺＣＳ）升压型变换器的基本电路,说明升压电感电流工作在不连续状态的必要性。采用三相整流电压的６次谐波前馈（注入）,以减小三相电源的５次庇波电流。减小主开关管关断损耗采用了零电流关断电路。     

14-14.5千兆赫卫星通信系统用的2千瓦行波管

维里安公司研制出一种新的空气冷却耦合腔行波管 VTU-6691A2。此管的连续波功率高达2千瓦。此管采用具有一个调制阳极的电子枪,该阳极工作于地电位或通过一个电阻分配网络工作于低电流。这种电子枪与一些 Ku波段耦合腔行波管、速调管以及 VTC-6363C1耦合腔 C 波段行波管中使用的类似,运用寿命达50,000小时。VTU-6691A2行波管采用开口框架磁铁,大大改进了机械设计特点。这种结构对管子和磁铁可进行很好的冷却,因而有助获得长期的可靠性。这种磁铁结构,在输入和输出传输线以及切断负载传输线上不必使用弯曲波导。     

W波段平面集成行波管高频系统设计及验证

针对W波段平面一维阵列集成行波管设计,采用非半圆弯曲变形折叠波导慢波结构和聚焦极调制皮尔斯电子枪,基于CST、MTSS和Opera软件优化设计了集成行波管高频系统和电子光学系统,实现了W波段低电压小电流工作的低功率行波管设计,通过周期永磁(PPM)聚焦系统制管验证了高频系统和电子枪设计的合理性。测试结果表明,行波管在工作电压12.62 kV,工作电流31.6 mA条件下,输出功率大于10 W的带宽达到5 GHz,增益优于28 dB,总效率优于10%,测试结果与设计结果具有较好一致性,为W波段行波管实现阵列集成提供技术支撑。     

集成离线式开关IC

LinkZero—AX采用创新的断电模式,可在最终产品闲置时有效关断辅助电源。断电模式由微控制器可获取的信号触发,它可以完全关断开关操作和内部开关控制电路.     

毫米波行波管电子枪设计

分析了毫米波行波管电子枪设计方法与厘米波行波管电子枪设计方法的不同特点,并提出了新的设计方法．     

Experimental Investigation of a Novel Circuit for Millimeter-Wave TWTs

A novel folded waveguide circuit that features thick iron pole pieces with hollow centers was built as part of a periodic-permanent-magnet-focused W-band single-stage test-vehicle traveling-wave tube (TWT). These hollow centers, which comprise part of the slow wave circuit, increase the rms axial field and significantly reduce the unwanted transverse field imbalance. For this TWT, a tetrode gun that creates an ultralaminar 20-kV 0.25-A nominal electron beam was used. It was demonstrated that this gun and magnetic structure can provide greater than 97% beam transmission for peak beam power levels as high as 9.25 kW (25 kV, 0.37 A). The unplated circuit, operating around 91 GHz on the edge of a passband, exhibits between 10 dB and 12 dB gain that compares favorably with results of device modeling utilizing the 3D particle-in-cell code Magic3D. Using a feedback approach to characterize large-signal operation, the tube generated 40 W of regenerative oscillator power. Design-optimized versions of this circuit show promise of enabling W-band TWT amplifiers that provide up to 300 W of peak RF output power     

Design of Overmoded Interaction Circuit for 1-kW 95-GHz TWT

Advanced simulation tools were used to design major components for a 95-GHz traveling-wave tube (TWT) providing approximately 1-kW of average power. This output power would be challenging, if not impossible, using a fundamental mode circuit TWT design, because of beam-current density and thermal-mechanical-stability issues. We addressed these limitations using an overmoded interaction circuit. The program investigated the circuits' thermal and electrical performance, including the effect of multiple-propagating modes and spurious oscillations. We also completed the designs for the electron gun and periodic permanent magnet. The design results for the 1-kW 95-GHz TWT are promising.     

栅-阴联合调制在Ka波段脉冲MPM中的应用

传统微波功率模块(MPM)中行波管通常采用栅极调制方式,行波管阴极始终浮在高压上,具有较高的打火概率,打火严重时可能会损坏行波管。为解决MPM 高压打火导致行波管损坏的问题,提出了MPM栅-阴联合调制的设计思路,既大大降低了行波管高压打火概率,即使发生打火,也能通过快速切断阴极调制开关,有效地保护行波管。阐述了行波管MPM 栅-阴联合调制研制思路及关键技术,并通过实验验证了该新型调制方式的可靠性,表明其具有较大应用前景。     

一种场效应管预失真电路对改善行波管非线性的作用

该文利用场效应管的非线性作用,替代通常预失真线性化电路中的衰减器和移相器,使这种预失真器在相位扩张量变化较小的同时,可以对增益扩张量进行调节控制,有效提升了预失真电路改善行波管非线性的作用。实际设计电路实验表明,在频率为8.38-8.58 GHz和额定输入功率范围内,设计了实际电路并完成相应的实验,获得了6 dB和45的增益和相位扩张以及15.4 dB的载波与交叉调制分量比值的改善。     

The influence of the spacings of the electron gun's triode on its characteristics

The behavior of a group of triodes of an electron gun having all the same cutoff voltage is discussed with respect to its physical dimensions. Especially the relation between gun characteristics and a design number (A, B) is investigated whereAis the distance between cathode surface and modulator and B between modulator and anode. For a fixed-grid drive pulse the total emitted cathode current and the portion of it passing through a beam-limiting aperture increases with increasingB(decreasingA) whereas the resolution decreases. If the electrical parameters like anode voltage and cut off voltage are already determined it can be concluded that there is a certain design number (A, B) for optimized beam density on a phosphor screen.     

Design of a Ka-band gyro-TWT for radar applications

The design of a Ka-band gyrotron traveling wave tube (TWT) amplifier capable of operating over a wide range of peak powers and bandwidths is presented. The amplifier operates in the TE₁₁ mode at the fundamental cyclotron harmonic. Instantaneous bandwidths in the range of 2.5 to 3.9 GHz (at 1 dB below saturation) with corresponding peak powers between 92.2 and 57.9 kW can be achieved by simply adjusting the mod-anode voltage of the electron gun. The corresponding gains range from 57.1 to 36.0 dB. The design performance is obtained with a high quality, 6 A, 70 kV electron beam generated with a double-anode magnetron injection gun. This wide range performance capability in the design is achieved via the use of the distributed loss approach in the interacting circuit, which also guarantees zero-drive stability. A diffractive loading scheme is employed in the lossy section of the circuit to ensure high average power operation of the amplifier     

S波段大功率行波管电子枪设计

采用皮尔斯电子枪综合法设计，并在综合法设计中引入圆筒电极聚焦和双阳极设置概念，再通过Egu。数值模拟、优化，方便、快速设计出了S波段大功率螺旋线行波管高导流系数、大电流、高电流密度电子注电子枪，该电子枪成功加工装配在行波管整管中。     

行波管栅控电子枪的动力学模态分析

栅控电子枪作为行波管的“心脏”,其结构的稳定性直接影响着管的脉冲输出性能,特别是在振动应力下的结构可靠性更是当今生产单位关注的重点。利用ANSYS软件对电子枪进行动力学模态分析可以得到电子枪的固有频率和振型,从而在结构设计上避免共振。     

一种计算OTA通用滤波器增益的简便方法

以OTA(运算跨导放大器)通用滤波器增益的计算为例,将拆环法推广到多环系统。拆环时可拆开任意一个环,其余部分视为一个无反馈系统,先求环路增益,再求前向通路增益,即可用反馈电路的基本方程求出闭环增益。强调拆分不同的反馈环,将有不同的环路增益和前向通路增益,但闭环增益不变。分析还表明,若能使拆分点把所有环路均断开,则可使环路增益、前向通路增益计算简便,从而使增益的计算更简单、实用。因此,推广的拆环法可快速计算高阶滤波器增益,适宜推广。     

彩色显示系统中电子枪截止电压的探讨

针对彩色显示系统中三管电子枪截止电压常有的零散与误差现象,从理论分析入手,结合大量实验数据,探讨阴极透镜几何尺寸对截止电压的影响,并提出有效提高截止电压准确性、一致性的方法