共查询到20条相似文献,搜索用时 9 毫秒
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利用线性理论对Ka波段工作模式为TE01模的回旋行波管进行了稳定性分析,计算了介质加载条件下工作和寄生模式的传播损耗,以及不同传播损耗下工作模式的起振电流;对不同介质加载条件和工作电流,给出了3个主要寄生模式的起振长度;确定了介质加载厚度以及相对介电常数等参数。计算结果表明,在优化得到的介质加载条件下,寄生模式在其各自振荡频点的单位长度传播损耗大于抑制各寄生模式返波振荡所需最低损耗值要求;工作模式起振电流大于设计所需工作电流;寄生模式的起振长度大于设计的介质加载段和未加载段长度;设计的介质加载参数能够满足抑制工作和寄生模式自激振荡的要求。利用优化设计的高频结构及介质加载参数,进行了整管热测实验,得到了输出功率160kW,饱和增益40dB,效率22.8%以及3dB带宽5%的回旋行波管。 相似文献
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在回旋行波管的设计过程中,输出结构性能的高低直接影响到整管增益的高低以及输出功率的大小。采用切比雪夫渐变波导作为耦合输出段,通过对轮廓线的计算程序进行改进,将中心频率作为可变量进行了修正。仿真结果表明,长度为75mm改进后的切比雪夫渐变结构不仅能抑制工作模式向杂模TE02和TE03的耦合,还能有效减少工作模式的反射。在整个工作频段内,杂模TE02和TE03的耦合系数分别低于-33dB和-65dB,TE01模的反射系数低于-20dB,TE01模的传输系数高于-0.01dB。 相似文献
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Xinhua Yu Lin Meng Xinjian Niu 《Journal of Infrared, Millimeter and Terahertz Waves》2010,31(1):48-53
A 30.5 GHz circular transition used to transmit TE01 mode is proposed because of no suitable one available. Calculations and simulations indicate that it can transmit TE01 mode with transmission efficiency over 0.99 (within a bandwidth of 3 GHz). At the same time, the good performance of it has
been demonstrated in experiment. Furthermore, the transition has only a length of 80 mm much shorter than linear or the other
nonlinear ones. Such short length is very helpful for construction of a compact microwave device. 相似文献
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螺旋波纹波导回旋行波管的模式耦合机制 总被引:1,自引:0,他引:1
从波导的等效边界条件出发,结合波导的激发方程组,通过数学推导说明了螺旋波纹波导回旋行波管的模式耦合机制。TE1,1模会在螺旋波纹波导中耦合出TE-2,1模,并且通过计算说明TE-2,1模主要和TE1,1模的空间-1次谐波发生耦合。 相似文献
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随着毫米波技术的发展,毫米波雷达也得到了更深入的研究和进一步发展,本文描述了回旋行波管的特点和应用要求,探讨了三种调制器在回旋行波管发射机中的应用情况,最后介绍了回旋管发射机的发展趋势和意义。 相似文献
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V形杆夹持、翼片加载的螺旋线但波结构很适合于宽频带行波管应用。本文对不同的翼片加载结构的色散特性进行了计算,计算数据与实验测量结果一致性较好。最后讨论了V形杆与圆形杆夹待时的介质负载和色散特性。 相似文献
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文章研究了回旋行波管介质加载高频结构中TE01 模式色散特性的测试方法,给出了测试结果并和理
论计算进行比较,根据测试结果分析了色散特性对回旋行波管输出特性的影响,同时预测了互作用的输出特性并和
实际测试结果进行了比较。 相似文献
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Hongbing Zhang Hongfu Li Huajun Wang Xiaolan Zhou Pin Zhong Du 《Journal of Infrared, Millimeter and Terahertz Waves》1998,19(11):1489-1498
The distribution of RF field of the slotted cylindrincal waveguide is discussed and the self-consistent nonlinear theory of the beam-wave interaction is presented in this paper.The behavior of the 95-GHz slotted third-harmonic gyrotron traveling-wave amplifier (gyro-TWT) with a uniform section is simulated by a Runge-Kutta algorithm code for an axis-encircling electron beam with velocity spread. Some important relations in the process of the beam-wave interaction are abtained and analyzed. 相似文献
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非线性理论是一种以驻波互作用过程为对象的大信号理论,它能准确地反应电子与波的互作用过程,计算输出功率、效率等其他非线性理论问题。采用非线性理论中的自洽非线性理论和耦舍波理论对螺旋波纹波导回旋行波管进行研究,结和电子运动方程和互作用方程,反映电子运动和场的激励相互演变过程。 相似文献
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Hongbin Zhang Hongfu Li Xiaolan Zhou Huajun Wang Sheng Yu 《Journal of Infrared, Millimeter and Terahertz Waves》1999,20(2):253-264
The behavior of a two-stage slotted Gyro-TWT amplifier is evaluated with a self-consistent nonlinear slow-timescale simulation code. The effects of the sever position and the lengths of the first section, sever, and the second section on beam-wave interaction are discussed in this paper. And the influences of the magnetic field and the electron beam's velocity spread on efficiency, gain and bandwidth are also simulated and discussed in detail. The electron beam we employ encircles around the axis of the wave guide. 相似文献
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翼片加载折叠波导电路是一种改进型的行波管互作用电路。与原始结构相比,它具有提高的耦合阻抗、扩展的横向尺寸以及更加灵活的设计能力,因此适合工作在太赫兹频段。首先采用理论模型设计了工作频率0.22THz的慢波结构;然后采用三维粒子模拟技术对翼片加载折叠波导行波管放大器的非线性性能进行了研究。结果显示,新型结构具有高的互作用效率和宽频带放大的能力。在中心工作频率220GHz处,2mW的驱动功率下可以得到4W的饱和输出功率,对应的电子效率和增益分别为2.47%和33dB(考虑了电路的导体损耗);恒定功率下扫频模拟显示,放大器的瞬时3dB带宽可达13.6,频率范围覆盖205~235GHz。 相似文献
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回旋行波管对回旋电子注参数(纵横速度比、速度零散等)非常敏感,实验中需进行电子参数调节,高质量电子枪研制是整管设计核心之一。基于理论分析、结构分析及热分析等对回旋行波管电子枪进行改进设计,对阴极、热子进行优化设计,研发的电子枪速度零散<2%,优于国际报道的3%。项目在热分析和形变分析基础上,改进了阴极结构及制备工艺,显著提高了热子加热效率,将阴极加热功率从100W降低至50W左右,提升了阴极发射的均匀性和稳定性,10%工作比下长时间工作稳定、可靠,有效保障了阴极寿命,新研电子枪在Ka频段回旋行波管装管实验,脉冲功率100kW,平均功率10kW,连续工作稳定、可靠。 相似文献
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In this paper a bandpass filter structure is proposed for realizing the artificial transmission lines of cascaded single-stage distributed amplifiers (CSSDA) and the basic analysis and design of the bandpass structured CSSDA (BP-CSSDA) is demonstrated. Some of the lower frequency region in the gain-frequency band of the CSSDA is not utilized due to presence of the bias components in traditional design methods. By using the bandpass structure for the realization of artificial transmission lines, the unused portion of the gain-frequency band can be utilized. Therefore, one can obtain more bandwidth using the bandpass type artificial lines in the CSSDA than using the lowpass type lines. The gain of a CSSDA can be increased, by increasing the interstage termination impedance (Z
0int) without compromising the bandwidth. In this paper, a graphical method for determining the optimum Z
0int is introduced. Simulation results showing the advantage of using the BP structured artificial lines in the CSSDA is provided. 相似文献
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Mukul Agrawal T. R. Sridhar P. K. Jain B. N. Basu 《Journal of Infrared, Millimeter and Terahertz Waves》2000,21(8):1255-1267
The gyro-TWT in a cylindrical waveguide of linearly-tapered cross section was analyzed for the gain-frequency response, using the Pierce-type gain equation. The taper in the waveguide cross section was adjusted for wide device bandwidths, either by changing the taper angle, while keeping the interaction length to be constant, or by changing the interaction length, while keeping the initial and final radii of the waveguide constant. Tapering led to the prediction of wide bandwidths, though at the cost of gain, as compared to a non-tapered device. The range of the DC background magnetic flux density relative to its grazing-point value was identified as a crucial parameter for large gains, with appreciable bandwidths, and minimum mode mixing in a tapered device, the latter in general facing more mode competition than a non-tapered device. 相似文献