渡越时间振荡器的注入式锁相研究

针对空间功率合成中多个微波源的锁相问题,设计了一种带有注入结构的Ku 波段同轴渡越时间振荡器。在输入 腔与三腔结构的调制腔之间,加入了效率99.9%以上的反射腔以防止功率向输入腔和发射端泄露。射频信号沿磁场方向注 入同轴波导,既保证了磁场线圈的连续,又抑制了器件中的不对称模式。粒子模拟结果表明,当注入比为0.1、频率差为 67MHz 时可实现锁相。研究还发现,高功率的注入信号能使器件提前饱和,并且得到更高的输出功率。另外,相比Adler 经典锁相理论,仿真结果得到了更大的锁相范围。     

94GHz连续波40kW回旋振荡管高频系统的设计

W波段的高功率连续波回旋管振荡器在毫米波非致命武器等领域有着重要的应用。该文首先通过起振电流的计算,确定了工作模式,继而利用自行开发的自洽非线性计算程序GYROSC对工作在94GHz频率的连续波回旋振荡管高频系统进行了模拟计算和优化设计。结果表明,设计的W波段连续波回旋管可获得输出功率40kW,电子效率大于30%。     

Numerical Simulation of MIG for 42 GHz, 200 kW Gyrotron

A triode type magnetron injection gun (MIG) of a 42 GHz, 200 kW gyrotron for an Indian TOKAMAK system is designed by using the commercially available code EGUN. The operating voltages of the modulating anode and the accelerating anode are 29 kV and 65 kV respectively. The operating mode of the gyrotron is TE₀₃ and it is operated in fundamental harmonic. The simulated results of MIG obtained with the EGUN code are validated with another trajectory code TRAK.     

2．4GHz电压控制振荡器的设计与仿真

通过分析测量BJT的S参数与稳定因子定,并利用已测量的BJT输出阻抗ZOUT来设计输出匹配电路,使整体电路在2．4GHz的频率上产生振荡。利用ADS软件对电路进行仿真。达到在BJT特定的偏压下。仍在2．4GHz的频率上持续振荡。并可利用电压的变化来控制其振荡频率的目的。     

Design of a 5.305 GHz Dielectric Resonator Oscillator with Simulation and Optimization

The design of a 5.305 GHz series feedback free running dielectric resonator oscillator （DRO） is presented. Its simulation and optimization are realized by obtaining the unloaded Q factor of the cavity dielectric resonator （DR） and analyzing the linear and nonlinear models of the DRO. CAD packages of DR_Rez and Agilent Advance Design System （ADS） are used and the best tradeoff among the output power, phase noise, and frequency stability is achieved. With the result of simulation, a physical oscillator prototype is constructed. The measured results show the good agreement with those of simulation.     

应用于802.11a的5.7GHz CMOS LNA设计

使用0.18μm CMOS工艺设计应用于802.11a WLAN的U-NII高频段5.7GHz的LNA.首先选取LNA结构,推导出噪声模型,然后选取在固定功率消耗下最小噪声系数对应的晶体管尺寸,再进行输入输出阻抗匹配和电路调整优化.在使用Bond Wire不加Pad时提供-22.014dB S11,-44.902dB S22,15.063dB S21,-39.44dB S12,2.453dB/2.592dB的噪声系数(NF),-4.1915dBm的三阶互调输入点(IIP3),-15.6dBm的功率1dB压缩点(P1dB)和10mW的功率消耗(Pd).完全考虑Bond Wire和Pad效应的性能参数也已经给出,但噪声系数恶化为3.21/3.23dB,S参数在电路调整优化之后变化不大,整体性能比较突出.     

A 100 kW, 140 GHz pulsed gyrotron

The design and operation of a 100 kW, 140 GHz pulsed gyrotron are reported. To our knowledge, this is the highest frequency at which high gyrotron output power (>-100 kW) has been achieved. Results are presented for gyrotron operation in the range of magnetic field from 4 to 7 T, voltage from 23 to 80 kV and current up to 7.5 A. Near a value of magnetic field of 5.4 T, and output power of 100 kW was obtained at 140.4 GHz in single mode operation in the TE₀₃₁ resonator mode.     

一种5.7 GHz CMOS 全集成低噪声放大器的设计

提出并设计了一种可以完全单片集成的5.7 GHz低噪声放大器(LNA)。该电路结构利用MOSFET自身的栅寄生电阻,通过简单的LC网络变换实现输入匹配;并采用跨阻结构,实现输出匹配。该电路采用TSMC 0.35μm CMOS工艺,用ADS模拟软件进行分析与优化。结果表明,设计的低噪声放大器,其增益为11.34 dB,噪声系数为2.2 dB,功耗12 mW,输入反射系数-33dB,线性度-4 dBm。     

360 GHz返波管的研究

对采用齿状光栅结构的慢波电路进行了研究,该结构在电子束与光栅表面接近的情况下有一定的通过率。在求得最大耦合阻抗条件下,设计了一种工作在360 GHz的返波管,通过对互作用电路的耦合阻抗的分析,可以减小亚毫米波及太赫兹真空电子学辐射源对阴极发射电流密度的要求。当工作电压为19.5 kV,工作电流75 mA时,PIC模拟结果得到了8 W的平均功率输出,考虑阴极为脉冲工作时,该器件在360 GHz可以得到4 mW的平均功率输出。     

A High-Gain, 28GHz, 200kW Gyroklystron Amplifier

A design study of a high efficiency/gain gyroklystron amplifier is performed to demonstrate amplified radiation power of 200kW operating at 28GHz. A key design feature of the present gyroklystron amplifier is that the amplifier is designed to be high gain so that it can be saturated by a low power solid state power amplifier. A non-linear, time-dependent, large signal numerical code is used to predict tube performance. Simulations predict that a stable amplifier radiation power of 214kW is produced with a saturated gain of 54dB, an electronic efficiency of 37%, and a frequency bandwidth of 0.3% from a five-cavity gyroklystron amplifier. The amplifier gain is found to be very sensitive to a beam velocity spread.     

An Iron-Free Magnetron-Injection-Gun for a 28GHz, 200kW Gyroklystron Amplifier

A design study of a double-anode magnetron-injection-gun is performed to incorporate the electron gun into a high power 28GHz gyroklystron amplifier operating at 70kV and 8.2A. The electron gun is designed to be used in a tapered magnetic field in the cathode region produced from an iron-free superconducting magnet. An electron trajectory code predicts a beam axial velocity spread of 5.9% at α = 1.5, 70kV, 8.2A and 10.4kG, which is a high quality electron beam suitable for the high gain, high efficiency, five-cavity gyroklystron amplifier. The successful design of the high quality electron gun is attributed to a longer gap between the modulating anode and the grounded anode compared with the case of the first 28GHz electron gun built with an iron enclosed electromagnet.     

17GHz双推式介质振荡器的设计

该文设计了一个基于双推式结构的介质振荡器,输出频率为17 GHz.该振荡器由两个独立的串联反馈式介质振荡器构成.该文介绍了串联反馈式介质振荡器的详细设计过程,并且应用了理论计算简化仿真过程,提高仿真精度.在振荡器的输出端口,用宽带威尔金森功率合成器同时实现了基波和二次谐波的合成,并应用λ/4开路微带线提高了基波抑制度....     

三极管特征频率下1GHz振荡器设计与仿真

三极管振荡器一般工作在截止频率附近，这时虽然能够输出较大信号，获得较好的频率稳定度，但是电路中滤波器性能的好坏直接影响输出的高次谐波干扰，而且这种设计思想大大限制了三极管往更高频率上的应用。谩计了在特征频率工作下的三极管振荡嚣，严格限制了高次谐波干扰。建立了射频三极管分布参数、封装参数模型，利用上述模型模拟了三极管特征频率下工作的振荡器振荡频率，输出电压与电源电压、振荡频率与电源电压、振荡频率与基极电感、输出电压与基极电感的关系。最后得出模拟与实验测试一致的结果。     

110GHz 阻性平衡三倍频器设计

本文介绍了一种基于阻性肖特基二极管芯片UMS DBES105a 的110GHz 三倍频器,通过两个芯片反向并联形成 了平衡结构,同时提高了倍频器的功率承受能力。电路设计中使用二极管三维电磁模型,匹配设计时未设计专门的输入 过渡和滤波器,而是直接经行匹配设计,提供了更多的可优化参量,以达到最佳的匹配效果和带宽。经过HFSS 和ADS 联合仿真,在频率为31~44GHz,功率为20dBm 的驱动信号激励下,三倍频器输出频率大于7dBm,最大输出功率为 9.1dBm@105GHz。     

1V 2.5GHz压控振荡器设计

设计了 1V ,2 .5 GHz的全集成压控振荡器 .通过优化集成电感的设计 ,同时采用 NMOS管和开关电容阵列作为可变电容 ,使该设计具有较低的相位噪声和较宽的调谐范围 .采用 0 .18μm CMOS工艺进行仿真 ,结果显示 ,在1V电源电压下 ,在偏离中心频率 6 0 0 k Hz处的相位噪声为 - 119d Bc/ Hz,调谐范围为 2 8% ,功耗为 3.6 m W.     

1V 2.5GHz压控振荡器设计

设计了1V,2.5GHz的全集成压控振荡器.通过优化集成电感的设计,同时采用NMOS管和开关电容阵列作为可变电容,使该设计具有较低的相位噪声和较宽的调谐范围.采用0.18μm CMOS工艺进行仿真,结果显示,在1V电源电压下,在偏离中心频率600kHz处的相位噪声为-119dBc/Hz,调谐范围为28%,功耗为3.6mW.     

110 GHz gyrotron with a built-in high-efficiency converter

A 110 GHz 1 MW pulse gyrotron has been elaborated. A built-in electrodynamic duct consisting of a new type quasi-optical converter and three matching mirrors transforms operating mode TE_15,4 into a gaussian beam going through the output window. The efficiency of the duct (ratio of the gaussian beam power outside the gyrotron to the total microwave power at the output of the cavity) is about 95%. A system consisting of the gyrotron and an outer mirror transmission line is proved to have efficiency (ratio of the microwave power measured by calorimeter at the end of line to the power of the electron beam) more than 40%.     

Development of 170 GHz/500 kW gyrotron

A development of 170GHz/500kW level gyrotron was carried out as R&D work of ITER. The oscillation mode is TE_31,8. In a short pulse experiment, the maximum power of 750kW was achieved at 85kV/40A. The efficiency was 22%. In the depressed collector operation, 500kW/36%/50ms was obtained. The maximum efficiency of 40% was obtained at P_RF=470kW whereas the power decrease by the electron trapping was observed. Pulse extension was done up to 10s at P_RF=170kW with the depressed collector operation. The power was limited by the temperature increase of the output window.     

CONCEPTUAL DESIGN STUDIES OF AN 84 GHz, 500 kW, CW GYROTRON

The feasibility of an 84 GHz, 500 kW, CW gyrotron for ECRH on an experimental tokamak will be presented in this paper. Mode competition and mode selection procedures are carefully investigated by considering various candidate modes and the TE_10,4 mode is chosen as the operating mode. A conventional cylindrical cavity resonator with weak input and output tapers and parabolic roundings is considered for interaction studies. Self-consistent, both single mode and time-dependent, calculations are carried out and power and efficiencies are computed for a typical set of beam parameters. The results show that an output power of well over 500 kW, CW and efficiency around 40% can be reached without a depressed collector.     

Conceptual design of a 42 GHz, 200 kW gyrotron operating in the TE5,2 mode

This paper deals with the conceptual design of a 42 GHz, 200 kW continuous wave gyrotron operating in the TE _5,2 mode with radial output coupling. The basic motivation and selection criteria are discussed and the design of the resonant cavity, magnetron injection gun, radio frequency (RF) guiding system, quasioptical output coupler and RF window is presented.