Ka波段行波管提高效率研究

本文针对Ka波段高效率行波管的特点,采用专门的设计技术提高电子互作用效率、收集极效率、电子流通率和采用匹配良好的输能系统,实现了Ka波段30 W,55 W,80 W和100 W系列连续波行波管,效率达到45％～60％范围.     

机载行波管发射机电源系统

介绍了机载行波管发射机电源系统的主要构建方式,针对机载行波管发射机电源系统实现的两大难点,即如何降低行波管管体高压电源电压纹波和提高电源系统效率、增加电源系统功率密度,提出了解决问题、改善性能的主要方法,着重介绍了几种高效率的零电压开关、零电流开关高频变换器的电路拓扑。     

高效率X波段40W空间行波管的设计

作为卫星通讯系统所用的高增益、高功率微波放大器件,行波管的效率和线性是非常重要的.本文根据卫星通讯的需要,给出了高效率X波段40 W空间行波管的设计,并成功研制出了样管.     

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.     

X波段脉冲空间行波管研制

本文主要介绍了X波段脉冲空间行波管的研制进展。通过解决大功率抑制返波振荡设计、高效率设计、栅网可靠性设计,研制出X波段1600 W脉冲空间行波管,实现功率1600 W峰值输出功率,效率50%的技术状态。     

电子战用功率行波管

介绍了电子战装备中宽带行波管及微波功率模块的特点,概括了宽频带、小体积、高效率功率行波管的现状和发展趋势。分析了电子对抗用宽波束的单元功率特点,讨论了弹载、无人机等对高效率、大功率、耐高温行波管放大器的需求。详细介绍了国内外新一代超小型化行波管及模块的最新进展。     

用于卫星通信基于波导魔T的高功率高效率空间行波管功率合成

空间行波管以其高功率、高效率等优势广泛应用于卫星通信,本文对两支X波段空间行波管进行功率合成设计及验证,设计一款低插损、幅相均衡、高隔离度的波导魔T功率合成器。通过前端引入移相器和衰减器,两只X波段45W空间行波管在0.7GHz内,输出功率大于85W合成效率大于90%。该合成器可以作为二进制功率合成单元用于更多支空间行波管大功率合成。     

高效率曲折槽波导毫米波行波管设计、制造和冷测

本文提出一种适用于工作在毫米波段(85～110 GHz)的带状注高效率曲折槽波导毫米波行波管,并进行了参数优化设计、加工制造和冷测实验研究.曲折槽波导首次采用一次改变周期相速跳变技术提高带状注毫米波行波管电子互作用效率.文中加工制造了三种不同周期个数(包含相速跳变和均匀相速两种类型)的曲折槽波导,并进行了S参数测试,其...     

工作脉宽对W波段行波管温度的影响研究

毫米波行波管具有大功率、宽频带、高效率等特点,在雷达、高速通信、电子对抗等现代电子装备中广泛应用。本文基于Ansys软件对W波段行波管进行热特性仿真,分析工作脉宽对行波管温度的影响。随着工作脉宽的增加,行波管温度升高,在占空比35%下,脉宽0.1、1和3 s的行波管温度分别达到了连续波行波管温度的56.8%,80.7%和87.2%。提高占空比至70%,脉宽0.1和1 s的行波管温度已达到连续波行波管温度的84%和96%,接近于连续波工作状态的行波管温度。通过分析不同脉宽的行波管温度差异,为长脉宽W波段行波管热可靠性设计奠定技术基础。     

微波功率行波管器件的发展和应用

本文介绍了微波功率行波管的典型应用、可靠性增长及主要工作原理,分析了毫米波和THz行波管、高峰值功率行波管、宽带行波管、微波功率模块、多频段一体化行波管、空间行波管及卫星通信行波管的主要现状。从国内外最新的研究计划出发,归纳了更高频率、更高效率、更大功率、宽频带和小型化、模块化、低成本方向及冷阴极应用的技术发展趋势,介绍了宽带雷达、通信和电子战等应用需求。     

A Tapered Ridge-loaded Folded Waveguide Slow-wave Structure for Millimeter-wave Traveling-wave Tube

This paper presents a tapered ridge-loaded folded waveguide (FWG) slow-wave structure (SWS) for broadband and high power millimeter wave traveling wave tube (TWT). The radio-frequency characteristics including dispersion properties, interaction impedance, S-parameters are analyzed. And based upon these results, the nonlinear large signal performance of the tapered ridge-loaded folded waveguide TWT working in W-band is simulated by 3-D particle-in-cell code. In the same ridge length, the tapered FWG has lower reflection and radio-frequency loss than the normal ridge-loaded FWG. Besides, the tapered ridge-loaded FWG TWT also has higher electron efficiency and larger bandwidth, which is more suitable for millimeter-wave TWT.     

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。     

The Key Technology of Efficiency Enhancement for Traveling Wave Tubes in Millimeter Wave

The efficiency enhancement methods for helix and coupled cavity traveling wave tube (TWT) in millimeter wave (MMW) are described. The interaction efficiency has been reached 14.56% by dynamic velocity taper in Ka-band TWT. Efficiency improvement has been carried out by used copper helix for broadband MMW TWT. Owing to a ferruleless coupled cavity TWT used phase-adjusted taper, the interaction efficiency has been increased from 9.6 to 22.6%. Finally, enhancing collector efficiency used multistage depressed collectors is discussed in the paper. These concept and technology of the approach are very useful for tube designer.     

提高宽带毫米波行波管效率研究

针对影响宽带毫米波行波管效率的主要因素,对提高行波管效率的相关实用化技术进行了研究。通过螺旋线线路渐变技术、降低高频损耗、多级降压收集极三个方面的研究,使现有某一宽带毫米波行波管总效率由原来的10%提高到20%以上。     

Study of Propagating Characteristics for Folded Waveguide TWT in Millimeter Wave

Folded waveguide circuit (FWC) is an ideal slow wave structure for broadband power traveling wave tube (TWT) in millimeter wave. But owing to changes of propagating character by reflecting of waveguide bend and electron beam hole, stopband can be formed. On the basis of computation of the stopband, effects of the dimension of FWC on stopband width are analyzed. It is available for design in FWC TWT.     

大功率毫米波行波管发展现状

毫米波行波管是一种具有重要发展前景的毫米波源,本文简要介绍了耦合腔行波管和螺旋线行波管的工作特点,以及国际上毫米波行波管的发展现状和趋势,指出了发展中遇到的一些关键问题。     

Improving Performances and Reducing Cost for Power Amplifiers in Millimeter Wave

The high power broadband amplifiers are key devices for millimeter wave system and equipment. The significant progresses for broadband amplifier–high power TWT in MMWs are described. Advanced techniques such as enhancing operating bandwidth, reducing cost, increasing efficiency, improving heat transfer capability, suppressing spurious oscillations and raising beam transmission have been developed. These approaches possess important consult value to designer for MMW power amplifiers.     

Design of a tapered helix for suppressing backward wave oscillations in MMW TWT’s

Backward wave oscillations are easy occurred in high power helix millimeter wave traveling wave tubes (MMW TWT’s), owing to larger ka value and higher operating voltage. The start current of backward wave is calculated for helix TWT in Ka band. It is shown that start current will increase by used a tapered helix. Backward wave oscillations can be suppressed in tube. The design method of the tapered helix is given in this paper.     

Performance and Application of Slow Wave Circuits for Power TWT in Millimeter Wave

In millimeter wave range, high-power traveling wave tube (TWT) is a key device with broadband and high-power amplification. Basis of comparing traditional and new type slow wave circuits for high-power TWT in MMW, analysis and computation of propagating and RF performance for folded wave circuit are carried out. Theoretic calculation and experimental test show that folded wave circuit is an ideal slow wave structure for broadband and high-power TWT in MMW. There is extreme wide application for the circuit in high-power TWT. This development possesses important consult value to designer for MMW power amplifiers.     

A two-cavity extended interaction klystron yielding 65 per cent efficiency

Results of experiments with a two-cavity extended interaction klystron are given. The tube is nominally capable of 1 kw-CW atSband and consists of two five-gap short-slot-coupled cavities coupled to the input and output lines by means of TWT matching sections with adjustable mismatches. The unusual features of the tube are 1) the length of extension of the resonant cavities (five electron ballistic wavelengths) and 2) the incorporation of different and controllable beam-circuit synchronism conditions for the input and output cavities. The results of principal interest are the low velocity spread in the spent beam entering the collector providing high total conversion efficiency (65 per cent) with collector depression and stable gain in excess of 15 db. Some treatment of the relationship of efficiency and oscillation stability is included, as well as comments on the usefulness of such a design for high power millimeter wave amplification.