适合于低波段宽带多注速调管的四耦合槽π模强耦合双间隙输出腔的设计和讨论

该文设计了一种适合应用于低波段宽带多注速调管的四耦合槽π模强耦合双间隙输出腔，并对其独特的优点做了详细的分析和讨论。     

多注双间隙耦合腔电子电导计算与模拟

该文基于空间电荷波理论模型,推导出多注双间隙耦合腔电子电导的单模理论和多模理论计算公式。比较结果显示对于双间隙耦合腔,单模理论计算结果足够准确。由粒子模拟结果与计算结果的一致证明了计算结果的正确性。最后使用粒子模拟研究了电压调制系数和聚焦磁场对电子电导的影响。结果显示当电压调制系数小于0.1并且聚焦磁场大于1.5倍布里渊磁场时,小信号理论计算的电子电导是准确的。     

速调管双间隙腔的间隙阻抗矩阵频率特性的模拟计算方法

该文建立了宽带速调管耦合双间隙腔的间隙阻抗矩阵频率特性的模拟计算方法,并运用该方法计算了一个S波段宽带速调管的重叠模双间隙输出腔的间隙阻抗矩阵和等效间隙阻抗的频率特性。最后将模拟计算结果与冷测数据曲线做比较,两者符合得较好,相对偏离只有10%-15%左右,从而检验了该模拟计算方法的可靠性。     

高次模多注速调管的矩形双间隙输出腔的研究

研究一种工作在TM1202高次模的速调管矩形双间隙输出腔模型。运用Mafia三维电磁场计算软件对模型进行计算机模拟,得出TM1202工作模式的频率、特性阻抗和场分布。加工了TM1202高次模多注速调管双间隙输出腔模型并进行冷测试验,测试结果与计算相符,并对计算和测试结果进行了分析。对该模型的研究为进一步研制工作在TM1202高次模多注速调管的高频输出系统提供了理论依据。     

双间隙双耦合口输出回路间隙阻抗的模拟计算

本文根据微波网络理论，建立了双间隙双耦合口输出回路间隙阻抗频率特性的冷测模拟计算方法。运用该方法，计算分析了某S波段双间隙双耦合口输出腔的间隙阻抗频率特性。结果显示，本方法与采用场分析法得到的结果符合良好。     

π-TM610模同轴双间隙腔耦合同轴线输出电路

该文提出一种适合于X波段多注速调管的π-TM₆₁₀模双间隙同轴腔的同轴线输出电路,并详细分析了其带宽和输出功率容限等重要性能,结果表明：π-TM₆₁₀模双间隙同轴腔耦合同轴线之后,输出腔中各个电子注孔的特性阻抗仍然很均匀;但由于输出腔外观品质因数太大而且无法使其降低,导致输出频带较窄;输出功率容限则为1MW左右。因此它比较适合作为高射频段的高功率窄带多注速调管的输出电路。     

强耦合式带状注速调管多间隙输出腔的设计

提出了一种强耦合式带状注速调管多间隙输出腔, 并将之应用于Ka波段带状注速调管输出腔的设计. 此设计可以获得更好的输出耦合特性和理想的场形. 更重要的是, 这种结构的漂移管允许被设计为对工作频率的截止状态, 从而可以获得更理想的电场场形以利于注波互作用. 从表面电流的角度分析了这种设计的理论依据. 通过使用粒子模拟软件进行仿真, 在中心频率获得了稳定的功率输出, 互作用效率达到50%以上, 3dB带宽约75MHz.     

矩形π-TM310模双间隙腔加载同轴滤波器型宽带输出电路的实验研究

本文详细介绍了矩形π-TM310模双间隙腔同轴滤波器型输出电路的实验研究过程,以及针对一些关键技术难点所采取的改进措施.测试数据显示,矩形π-TM310模双间隙腔与输出同轴线的耦合强度适中,其外观品质因数30左右,在加载同轴线之后各个电子注孔特性阻抗的均匀度仍然较好;矩形π-TM310模双间隙腔同轴滤波器型输出电路的输...     

双间隙输出腔速调管的注波互作用程序分析

双间隙耦合腔作为展宽频带、提高效率、提高峰值功率和平均功率的有效手段已广泛用于多注速调管和大功率速调管中,但是目前对速调管双间隙输出腔的理论研究多为利用现有的模拟软件来进行仿真计算,所需时间很长,为了研究大功率速调管特别是在双间隙输出段中的注波互作用过程,作者利用一维单周期时间积分模型开发了一个快速分析程序。利用这一模型计算的电子群聚图形结果与MAGIC模拟所得结果很接近。由于本文所编写程序的耗时很短,因此可以对影响注波互作用的参量进行快速分析。     

速调管耦合双间隙腔输出回路的绝对稳定性判据

通过解析推导和适当的简化处理得到了速调管耦合双间隙腔输出回路的绝对稳定性判据,并对不同类型的耦合双间隙腔输出回路的稳定性进行比较和讨论.     

A direct method to compute the coupling between nonidentical microwave cavities

A new technique to compute the coupling, as a function of frequency, between nonidentical resonators is presented in this paper. The structure is separated by introducing electric and magnetic wall boundary conditions on the plane of separation, and coupling coefficient is computed directly from the eigenvalues of the four individual structures. The proposed technique has been used to compute the coupling between coaxial combline resonators. It is found to be computationally much faster than the iterative technique. The computed results are in good agreement with the measured results.     

Intercavity coupling constant of the cavities

The coupling coefficient of two cavity resonators taking very small values is considered. A technique for measuring the coupling coefficient via loaded Q factors and coefficients of coupling with external lines is proposed. The dependence of the intercavity coupling coefficient on dimensions of the aperture of the diaphragm between the cavities is determined. The data obtained are compared with the values obtained using a technique based on finding the system resonance frequencies corresponding to phase angles 0 and π of intercavity oscillations.     

Temperature dependence of composite microwave cavities

Composite microwave resonant cavities contain several regions of different dielectric materials. The variation of the resonant frequency with temperature is described in terms of a linear model. One part of the frequency variation is caused by the physical expansion of material parts, and the other by the change in the relative dielectric constant. The frequency sensitivity coefficients for both types of variation are obtained with the use of a computer code for numerical analysis of the electromagnetic field inside bodies of revolution     

复杂电大开口腔体的高功率微波防护分析

提出考虑传输衰减的高功率微波（HPM）激励模型,基于镀膜透明介质结构设计流程,给出了电磁透射率、反射率计算方法和厚度远低于网格尺寸的薄膜等效处理时域有限差分（FDTD）算法,设计了一种透明导电镀膜的介质屏蔽结构,建立复杂结构与电磁参数的真实三维飞机-飞行员模型,开展了电磁防护分析。仿真结果表明：采用电场幅度最值衰减和防护极限评估防护效果具有良好的工程适用性,且该屏蔽结构在一定载频范围内辐射防护效能好,防护极限高。     

Approximate calculation of eigenfrequencies of biconical microwave cavities

Simplified expressions are obtained for the calculation of the eigenfrequencies of a biconical cavity with large apex angles with the use of two symmetrical points at the boundaries of overlapping partial regions in the form of a spherical sector. Using these expressions, the dependence of the cavity eigenfrequencies on the apex angles of the conical elements is studied, and the results are compared with those obtained by the classical finite-element method. The applicability range of the simplified expressions is identified, and recommendations on their use are given.     

非共轴腔之间的模式匹配特性

本文从腔体的模式理论出发，给出了基横模到基横模、一阶、二阶、三阶、四阶横模的模式耦合及功率耦合系数作为光束半径失配，相前曲率失配，及非共轴失配的函数的解析表达式，并进行了分析讨论，指出了在非共轴失配存在时，奇、偶、模之间的耦合系数不为零的结论。     

Properties of microwave cavities for radiometric temperature measurement.

Cavity-type coupling structures can be used for industrial microwave radiometric temperature measurement in lossy dielectrics. The cavity properties which determine the measured radiometric signal are defined and applied, and a simple technique for measuring these properties is described.     

Ku band damage characteristics of GaAs pHEMT induced by a front-door coupling microwave pulse

A study on the damage effect of a GaAs pseudomorphic high-electron-mobility transistor (pHEMT) low-noise amplifier (LNA) induced by a Ku-band microwave is presented in this paper based on an experiment and simulation study. The experimental results suggest that the burn-out in the first stage is responsible for the LNA damage. Scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS) were used to observe the damage situation and compare the element composition before and after the high power microwave (HPM) injection. It is found that the gate metal is melted as a result of heat generation. The location beneath the gate near the source side is badly burned and splashes out. A detail simulation is performed by establishing a two-dimensional electric-thermal model considering several physical models and thermal parameters using the simulator Sentaurus-TCAD. The results show that the burn-out location is consistent with the experiment findings. Meanwhile, a temperature elevation occurs in both the positive and negative half cycles. Moreover, the damage to pHEMT shows the working voltage dependence, and the burn-out time increases with the increase in drain voltage.     

Resonant frequency and Q factor of axisymmetric composite microwave cavities

Resonant frequency and unloaded Q factor of composite microwave cavities are computed using surface integral equations for axisymmetric objects. The equivalence principle is used to formulate the problem so that the unbounded space Green's function can be utilized. The numerical results are verified experimentally for many samples of conducting cavities and dielectric resonators inside conducting cavities. Also, cases with a sector of the rotational cavity are considered by introducing a conducting corner. The method allows the computation of the stored energy in each dielectric region and the unloaded Q factor.     

基于耦合矩阵修正和空间映射法的滤波器设计

为提高微波滤波器的设计效率,本文提出了一种基于耦合矩阵修正和空间映射法的滤波器快速设计方法。利用空间映射的思想,将滤波器最佳尺寸的求解问题转换成耦合矩阵的逼近问题,并逐步修正耦合矩阵的值。最后应用HFSS设计了一款六腔同轴滤波器,在初值很不好的情况下,经过6次迭代即可几乎得到理想响应对应的最佳尺寸,仿真结果良好,从而证明了此优化方法的快速,可行,高效。