用于栅控行波管的全固态快速保护开关

为满足栅控行波管打火时快速保护的要求,研制了一种全固态快速保护开关。介绍了全固态快速保护开关的组成、工作原理、设计方法和特点。阐述了高压开关、导通/ 关断驱动、电流检测、结构的设计。开展了模拟打火保护试验并给出了打火波形。实验及实践表明:全固态保护开关可在1 滋s 之内切断电流通路,快速地保护大功率栅控行波管,可广泛应用于行波管发射机。     

阴控主振式发射机高压打火问题分析

着重讨论基本刚管调制器调制的阴控行波管发射机的打火问题，从工作原理、设计角度进行分析，判定发射机高压打火的原因，以保证发射机在工作中不发生或少发生打火。     

毫米波小型化行波管发射机

叙述了1种毫米波行波管发射机的设计方法和工作特点。介绍了其频带宽、增益高、体积小、重量轻等特性;对宽带毫米波栅控行波管的管体特性、高压电源小体积高压整流电路、栅控调制器波形参数和打火保护的设计进行了详细说明;最后给出了发射机的测试结果和测试照片。     

高压电源的慢启动电路改进

针对经常性造成高压设备打火,影响发射机可靠性的某型号雷达发射机高压电源加高压瞬间电压过冲现象,深刻剖析原因,给出解决此问题的几种方案,对于栅控行波管发射机的高压电源的慢启动有借鉴意义.     

Ka波段雷达发射机调制器的设计

从调制器在栅控行波管发射机中的应用和设计原理出发,给出了某Ka波段雷达脉冲调制器的设计思路。同时给出了调制器电路的设计原理图以及调制脉冲输出波形。     

平面栅型FED的模拟研究

采用ANSYS有限元分析软件对平面栅型场致发射显示器（FED）的阴极表面电场进行了模拟分析。通过研究栅极宽度、阴栅间隙及阴极宽度对阴极表面电场分布的影响．结果表明平面栅型FED为边缘发射型器件,阴极宽度的改变对阴极表面电场整体影响明显．而阴栅间隙是影响阴极边缘电场分布的主要因素。     

行波管打火机理及其外围电路防护方法

通过介绍行波管的结构特点和工作原理,分析了行波管发射机打火的机理。针对行波管不同部位的打火,提出了发射机电路的几种保护措施,为发射机的电路设计提供参考。     

批产阴极发射电流稳定性的研究

针对脉冲栅控行波管在批量生产过程中出现发射电流不稳定的现象,结合具体问题分别从阴极本身发射能力的一致性及电子枪内结构中的阴极-栅网距离等方面进行研究。结果表明通过建立阴极抽样检测方法可使阴极的发射良品率提高30%;适当控制阴极-栅网之间的距离,可避免电子枪的温度过低及脉冲电压高等现象,从而最终保证批量生产阴极发射电流的稳定性。     

On the Research of Stability for Emission Current of Lots Production

针对脉冲栅控行波管在批量生产过程中出现发射电流不稳定的现象,结合具体问题分别从阴极本身发射能力的一致性及电子枪内结构中的阴极-栅网距离等方面进行研究.结果表明通过建立阴极抽样检测方法可使阴极的发射良品率提高30％;适当控制阴极-栅网之间的距离,可避免电子枪的温度过低及脉冲电压高等现象,从而最终保证批量生产阴极发射电流的稳定性.     

脉冲调制行波管电源 把射频相位不稳定性和高压贮能降到最小值的技术

功率微波电子管电极上的波纹电压,限制了动目标显示雷达系统的性能。当雷达采用不同的脉冲重复频率时,由于负载工作状态的变化,脉冲波纹增大。作为行波管功率放大器,阴极到管壳间电压的变化引起发射波形的相位调制和振幅调制,而动目标显示性能的降低主要原因就是相位调制。△φ(t)=K_φ△V_k(t),其中K_φ是行波管的阴极相位灵敏度,△V_k(t)是阴极电压的变化量。以加大高压电容数值的方法减少△V_k(t)是可能的,但是这样处理贮能也随之增大。串联调节器是另一种可选用的方法,但这意味着电路更加复杂,导致可靠性的降低,而且设计更费力。本文叙述高压电源的组成。它可以解决限制高压贮能问题。     

大功率电路绝缘问题分析

在大功率电子线路中,电压高、电流大,经常会出现打火现象。以工作在阴调方式的雷达发射机为例,简要介绍了发射机的基本工作原理。从发射机的设计过程、加工环节、工作环境和使用维护等角度出发,详细介绍了发射机电路打火的本质,分析了可能引起打火的原因、打火时的能量传递途径,说明了打火对大功率电子线路所产生的危害性,提出了预防和应对打火的措施,尽量保证大功率电子线路少打火,提高电路可靠性。     

空间行波管放大器用栅控调制技术

为满足宇航用空间脉冲行波管放大器对阴极发射电子束的控制要求,设计一种高可靠调制器,具备对脉宽和占空比的保护功能和对栅极控制行波管放大器的调制能力,在卫星寿命末期可通过地面遥控指令,改变星上栅压正偏输出,补偿行波管阴极发射能力下降。     

Emission reserve mapping of CRT-type cathodes

The "dip test" was recommended in 1956 to evaluate the emission activity of cathodes, and this method is now in common use for evaluation of cathodes in microwave tubes and in other electron devices wherein unvarying geometry and field configuration permit simple application of the test and interpretation of results. Application of the "dip test" to CRT cathodes, however, involves complexities associated with a) variation of emission current density from center to edge of the cathode, b) variation of the emitting area and current density with intensity modulation (grid voltage), and c) variation of the grid-cathode geometry which takes place during the cooling period of the dip test. A method has now been developed for accurately evaluating the cathode activity for varying radii of concentric circular cathode areas. A figure of merit is introduced which characterizes the cathode emission.     

低电压、高脉冲输出功率Ka波段行波管研制

应用于毫米波系统的行波管电压低、效率高,本文简要分析了低电压、高脉冲输出功率Ka波段行波管关键技术,介绍了设计方案和制管结果。行波管在17 kV工作电压脉冲输出功率600 W。     

A 500-W coupled-cavity TWT for Ka-band communication

Worldwide demand for high-power amplifiers for digital satellite communication at Ka-band frequencies between 27 and 31 GHz is steadily increasing (2003). Communication and Power Industries (CPI) has developed a 500-W periodic permanent magnet focused coupled-cavity traveling wave tube (TWT) for conduction-cooled amplifier systems, which is being introduced into the commercial satellite communication market. The TWT is capable of greater than 500-MHz instantaneous bandwidth and is cathode voltage tunable from 28.3 to 30 GHz. The TWT may be operated saturated at the 500-W output power level or backed off from saturation in the linear mode. CPI's Satcom Division has integrated the TWT into a conduction-cooled transmitter box suitable for antenna hub-mount applications. The amplifier uses predistortion networks to provide a high degree of linear response when operated in output power back-off mode.     

矩形耦合腔行波管的研究

为了得到高功率、高频率、大带宽的微波源,运用微波仿真软件CST对矩形耦合腔行波管这一新型的大功率器件进行了粒子模拟,得到了23．7kw的峰值输出功率,并且分析了行波管的工作电压与慢波系统的腔体数量对行波管工作特性的影响。结果表明,矩形耦合腔行波管具有较高的功率承载能力。     

多级降压收集极行波管高压电源的设计

为了提高真空管雷达发射机的效率、缩小整机的体积和重量,常使用多级降压收集极行波管作为功率射频放大器.为了保证多级降压收集极行波管高增益、高效率和良好线性等性能发挥的更好,就要在行波管每个电极上加合适的电压,确保行波管内建立稳定的电场.因此,根据行波管各电极的特性合理地选择各收集极的电压以及合理的设计高压电源显得尤其重要.文中结合多级降压收集极行波管的工作特性介绍了4种高压电源的设计方法及其特点.     

Transient ion disturbances in traveling wave tubes

It is well known that the presence of ions in the electron beam of a traveling wave tube (TWT) can lead to periodic variations in the output power, phase and the body (or helix) current. This has been referred to as ion noise or jitter. Recently, we have observed a different form of jitter, and while it is still observed as a small variation in the TWT output (typically <0.5 dB in power and 2° in phase), it is not periodic. We refer to this phenomenon as random jitter, since its random nature in time is a defining characteristic, Other characteristics include a relatively fast onset (~1 ms) and slow (~500 ms) recovery. It was found that random jitter was due to the spurious release of extremely small amounts of trapped gas inside the TWT. The source of the gas was identified and the problem was resolved. The observed level of fluctuations in power and phase had no effect on digital traffic and the small quantity of gas was found to have no measurable impact on cathode life