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1.
本文提出了一种新的HEMT器件非线性CAD模拟方法,即可以利用PSPICE程序中GaAs MESFET的非线性CAD模型对HEMT器件进行非线性模拟,并用实验验证了这种方法的正确性。  相似文献   

2.
本文提出了一种新的HEMT器件非线性CAD模拟方法,即可以利用PSPICE程序中GaAsMESFET的非线性CAD模型(Statz模型)对HEMT器件进行非线性模拟,并用实验验证了这种方法的正确性。  相似文献   

3.
相对论返波振荡器的非线性理论   总被引:1,自引:0,他引:1       下载免费PDF全文
本文建立起分析相对论返波管注波互作用过程的自洽非线性工作方程组,理论模型中计及了正向波基波与电子注的异步互作用效应、电子注的空间电荷效应.运用四阶龙格一库塔法编制了数值求解工作方程组的Fortran程序,对均匀耦合阻抗型器件和耦合阻抗单阶跃变型器件的效率进行了仿真和优化.数值模拟结果表明正向波基波与同步波在慢波结构起始处的相差,正向波基波与电子注的异步互作用效应能显著地影响相对论返波管效率,均匀阻抗器件运行于最佳状态时,效率可达到27%,耦合阻抗单阶跃变型器件最优化效率可达到50%.  相似文献   

4.
根据相对论返波管(RBWO)的非线性理论,数值模拟了耦合阻抗单步跃变型RBWO效率与束流参量、耦合阻抗跃变位置、高低耦合阻抗比值的依赖关系,结果表明器件最优化效率可达到50%.设计制造了一个X波段高功率耦合阻抗单步跃变型RBWO,运用全电磁粒子模拟程序仿真了器件中注波互作用过程,预见出器件功率、效率、频率等性能参量.在电子注电流、注加速电压、互作用区长度相同的实验条件下,测得变阻抗器件实验效率约为均匀阻抗型器件效率的2倍.  相似文献   

5.
首次提出了由双电子注同轴相对论返波管来产生双频微波输出,采用2.5 维相对论全电磁PIC 粒子模拟软件,进行粒子模拟研究。结果表明在环形相对论电子注电压625kV,电流24kA,引导磁场0.772T 的条件下,器件得到了稳定的高功率双频微波输出。其双频微波频率分别为11.5GHz 和12.2GHz,两频率相差700MHz,平均功率约为1.15GW,平均功率效率7.7%。  相似文献   

6.
变阻抗相对论返波管的研究   总被引:4,自引:0,他引:4  
根据相对论返波管(RBWO)的非线性理论,数值模拟了耦合阻抗单步跃变型RBWO效率与束流参量、耦合阻抗跃变位置、高低耦合阻抗比值的依赖关系,结果表明器件最优化效率可达到50%,设计制造了一个X波段高功率耦合阻抗单步跃变型RBWO,运用全电磁粒子模拟程序仿真了器件中注波互作用过程,预见出器件功率、效率、频率等性能参量,在电子注电流、注加速电压、互作用区长度相同的实验条件下,测得变阻抗器件实验效率约为均匀阻抗型器件效率的2倍。  相似文献   

7.
Ku波段PHEMT单片低噪声放大器的设计与实验   总被引:1,自引:0,他引:1  
通过分析微波单片集成电路(MMIC)与常用的微波立体电路的不同点,讨论了采用通用的微波电路软件进行MMIC精确设计的有效途径,着重分析了在软件中如何建立三类MMIC用元件(有源器件、无源元件及由MMIC工艺决定的特有图形元件)电路模型的方法,借助这一分析,使用通用的微波电路软件,完成了Ku波段两级AlGaAs/InGaAsPHEMT单片低噪声放大器的设计与研制,取得了与CAD设计值十分相近的实验结  相似文献   

8.
为了实现相对论返波管振荡器(RBWO)永磁包装,本文采用Magic模拟软件在0.5T低磁场相对论返波管(RBWO)器件结构基础上,通过在器件慢波结构末端添加一个部分反射腔,减小电子束质量对束波转换影响,即减小引导磁场的影响,实现了Ku波段相对论返波管振荡器0.3T磁场下运行.当电子束束压600kV、电子束束流7kA时,模拟得到器件输出微波功率740MW,效率18%.尽管该器件的效率低于0.5T磁场下的效率(25%),然而0.3T引导磁场在工程上更容易实现.结合小型化的脉冲功率源进行实验研究,当二极管束压580kV、束流6.5kA,实验获得功率600MW,频率13.10GHz,脉宽25ns的微波输出,该器件的研制可以促进高功率微波(HPM)系统小型化的发展.  相似文献   

9.
本文提出了用于模拟GTO关断特性的SPICE等效电路模型.根据器件的工作特性并结合器件结构提取模型参数.用此模型对1000A/2500V阳极短路型GTO的关断特性进行了模拟,包括关断电流拖尾现象在内的整个关断过程,模拟结果与器件的测试结果吻合较好.  相似文献   

10.
王静  邓先灿 《微波学报》1999,15(1):63-67
本文首先分析GaAs MESFET在自升温效应下的升温幅度,然后结合器件电学参数随温度变化的特点,对器件的大信号等效电路模型进行了自升温效应下的修正。修正后的模型更准确地反映了器件的工作特性,应用于GaAs MESFET功率MMIC CAD中能进一步提高电路的设计精度。  相似文献   

11.
扩展互作用速调管是在大功率速调管的基础上,采用扩展互作用谐振腔技术,扩展其瞬时工作带宽,在毫米波频段能够实现高功率、高效率、高增益和宽频带的一种紧凑型微波真空器件。本文基于空间电荷波理论对多间隙谐振腔电路进行了简要分析,采用PIC三维粒子模拟软件对高频互作用电路进行了粒子模拟与优化。在2π模式工作下,其工作电压为15 kV,电流为0.8 A,中心频率为94.5 GHz时,得到了效率大于8.4%,峰值功率超过2 kW的微波功率输出,-3 dB带宽为1 GHz,增益超过40 dB。该工作对研发高性能扩展互作用速调管,并推动其在国防安全、卫星监测、外层空间小目标跟踪、高分辨率雷达和精确气象监测等领域应用具有重要意义。  相似文献   

12.
In this paper the interaction between a relativistic electron beam moving in a static magnetic field and a travelling electromagnetic wave is analysed by using the kinetic power theorem. The concept of the electron bunching function is introduced to illustrate the bunching process of beam electrons as a whole. By numerical calculation, the energy exchange process between gyrating electrons and the travelling wave field is obtained in detail. The results of the calculation show that the imaginary part of the axial wave number does not stay constant along the interaction length and that the gain characteristic is non-linear. Based on this analytic method, the maximum output power and efficiency of the gyrotron amplifier with a uniform waveguide are calculated and are found to depend critically on the value of the static magnetic field and the operating frequency. A new type of gyrotron amplifier is suggested here. In this device the gyrating electrons interact with the travelling wave in an undulated waveguide. Its instantaneous bandwidth is somewhat broadened and the optimum value of applied magnetic field is not too critical.  相似文献   

13.
On the basis of a work of Wu Jianqiang et al.(1987),by making use of the linear kinetictheory,the gyromonotron with a combining periodic magnetic field and a coaxial cyclotron electron beam hasbeen analysed in detail.And the formulas of the electron beam to wave interaction power,frequency shift andstarting current,etc.have been derived.  相似文献   

14.
Characteristics and optimum operating parameters are determined for a new type of high-power high-efficiency generator of millimeter waves known as a gyrotron traveling wave amplifier. In the example consided, wave amplification results from the interaction of a TE/sub 01/ waveguide mode with the fundamental cyclotron harmonic of an electron beam. The parameter optimization involves the determination of the point of maximum device efficiency as a function of beam density, beam energy, beam positioning, and external magnetic field for the output power required. An analytical linear theory and a numerical simulation code form the basis of theoretical calculations. As a result of the extensive survey in parameter space, the peak efficiency in the beam frame has been found to exceed 70 percent. This result has been applied to the specific design of a 35-GHz amplifier with output power ~340 kW, a power gain of 2 dB/cm, and a laboratory frame efficiency of 51 percent.  相似文献   

15.
An electromagnetic particle-in-cell code has been used to simulate the nonlinear beam wave interaction and other optimization issues of a X-band RBWO with variable couple impedance, the simulation results show: the device can high-efficiently generate microwave radiation of 950MW peak power at (9.06±O.03) GHz when it is driven by a 5KA-500KV annular electron beam, peak power efficiency is 38%. The preliminary experiment results show that the microwave-generating efficiency of the non-uniform impedance RBWO is about twice of the uniform case in the same operating conditions.  相似文献   

16.
大功率速调管是一种基于速度调制原理将电子注能量转换成微波能量的微波真空电子器件,它具有高功率、高效率、高增益和高稳定性等优点,是微波真空电子器件中脉冲功率和平均功率最高的器件。速调管自20世纪30年代发明以来,在粒子加速器、雷达和通信等微波电子系统,以及真空电子技术进步的推动下,已发展成功多种类型大功率速调管,其频率覆盖整个微波,并扩展到毫米波和太赫兹波段,最大脉冲功率达200MW,最大平均(连续波)功率达MW级。近年来,在高能粒子加速器、宽带雷达系统、毫米波和太赫兹波电子系统的推动下,大功率速调管取得了令人瞩目的进步,本文比较系统地介绍了大功率速调管的技术现状和在提高功率、提高效率、提高工作频率、展宽带宽等方面取得的最新进展。  相似文献   

17.
A theoretical analysis and an experimental study of millimeter wave generation by a fast wave interaction between a bunched electron beam and a transverse wave are reported in this paper. The technique appears to be practical for the generation of wavelengths as short as 1 to 2 mm. The experimental apparatus reported here converts power at a frequency of 9.17 Gc to power at a frequency of 39.71 Gc with an output power of 2 to 3 mw.  相似文献   

18.
A low frequency, injected beam, circular format crossed-field amplifier has been designed and constructed for the purpose of studying electron-radio frequency wave interaction in reentrant devices. The device has been designed to allow in situ diagnostic probe measurements in the space between the anode and sole. The device has been operated in nonreentrant, fully reentrant, and reentrancy controlled configurations. Details of the design and operating parameters are described. Device characteristics are examined with respect to the amount of circulating charge or degree of reentrancy. A large increase in gain has been achieved from nonreentrant to the fully reentrant format. A gain of 7.2 dB has been obtained for the latter whereas only 3.8 dB has been obtained for the former with 30 mA of injected beam current. A maximum gain of 14.4 dB has been achieved for the fully reentrant configuration. Electron beam and noise measurements versus the degree of reentrancy have also been examined. Results from the nonreentrant amplifier performance have been directly compared with the MASK simulation code and good agreement has been obtained. These experiments will provide the basis for more detailed investigations on the effect of reentrancy on CFA operation and will also allow for the development of more accurate computer models of the reentrant system for numerical simulation of CFA operation  相似文献   

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