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该文提出了3种槽加载折叠波导行波管慢波结构:三角形、梯形和燕尾形槽加载折叠波导。分析比较了不同槽形状对慢波结构的色散特性和耦合阻抗的影响。利用粒子模拟的方法对W波段4种槽加载折叠波导行波管的非线性注-波互作用进行了研究;在相同的电子注参数和输入功率的条件下,对输出功率、电子效率和增益等参量进行了比较。在多种槽加载结构中,梯形槽加载折叠波导输出功率(255 W)和增益(37.1 dB)最大,电子效率最高(10.7%);燕尾形槽加载折叠波导达到饱和所需要的互作用电路最短(64.2 mm);三角形槽加载折叠波导的3 dB带宽最宽。 相似文献
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在带状电子束假设下,采用场匹配和导纳匹配的方法,导出了存在电子束的任意槽矩形波导栅行波管的"热"色散方程,对该方程进行数值求解,得到了小信号增益,分别讨论了慢波结构槽形状和电子束参量对小信号增益的影响,为毫米波矩形波导栅行波管的设计提供了理论依据. 相似文献
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研究了三种新型的曲折波导慢波系统,分别是曲折双脊波导、脊加载曲折波导和矩形槽加载曲折波导。给出了其高频特性的理论和仿真结果。然后介绍了基于常规曲折波导和脊加载曲折波导慢波系统的Ka 波段行波管的实验结果。 相似文献
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提出并研究了一种菱形曲折波导慢波结构。与传统的矩形曲折波导慢波结构相比,菱形曲折波导慢波结构在相同频带下拥有更大的尺寸,在相同尺寸下拥有更宽的带宽。同时提出了适用于这种慢波结构的输入-输出过渡结构和衰减器。在此基础上,设计了一种用于行波管的340 GHz菱形曲折波导慢波结构,并采用相速负跳变技术提高了其增益。模拟仿真结果表明,在加载电压为15.3 kV,电流为35 mA的圆形电子注的情况下,行波管在343 GHz的输出功率和增益分别达到8 W和33 dB,其3 -dB带宽范围为330~348 GHz。 相似文献
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《红外与毫米波学报》2021,(4)
提出并研究了一种菱形曲折波导慢波结构。与传统的矩形曲折波导慢波结构相比,菱形曲折波导慢波结构在相同频带下拥有更大的尺寸,在相同尺寸下拥有更宽的带宽。同时提出了适用于这种慢波结构的输入-输出过渡结构和衰减器。在此基础上,设计了一种用于行波管的340 GHz菱形曲折波导慢波结构,并采用相速负跳变技术提高了其增益。模拟仿真结果表明,在加载电压为15.3 kV,电流为35 mA的圆形电子注的情况下,行波管在343 GHz的输出功率和增益分别达到8 W和33 dB,其3-dB带宽范围为330~348 GHz。 相似文献
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提出一种改进的曲折槽波导—曲折双脊槽波导提高太赫兹行波管的功率和带宽.针对这种新型慢波结构设计了一种新的传输波导作为输入输出能量耦合器.从高频特性仿真结果可以发现曲折双脊槽波导可以提高耦合阻抗并扩展带宽.此外, 粒子仿真结果表明当电子注加载27.4kV电压和0.25A电流时, 新型曲折双脊槽波导行波管在中心频率340GHz处输出功率能达到65.8W同时对应增益27.21dB.因此, 曲折双脊槽波导行波管可以用作宽带和高功率太赫兹辐射源. 相似文献
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《红外与毫米波学报》2018,(6)
提出一种改进的曲折槽波导—曲折双脊槽波导提高太赫兹行波管的功率和带宽.针对这种新型慢波结构设计了一种新的传输波导作为输入输出能量耦合器.从高频特性仿真结果可以发现曲折双脊槽波导可以提高耦合阻抗并扩展带宽.此外,粒子仿真结果表明当电子注加载27.4kV电压和0.25A电流时,新型曲折双脊槽波导行波管在中心频率340GHz处输出功率能达到65.8W同时对应增益27.21dB.因此,曲折双脊槽波导行波管可以用作宽带和高功率太赫兹辐射源. 相似文献
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Yanyu Wei Hongtao Liu Jun He Yubin Gong Lingna Yue Wenxiang Wang Gun-Sik Park 《Journal of Infrared, Millimeter and Terahertz Waves》2007,28(12):1051-1062
Properties of traveling wave-beam interaction in a centered dielectric-rod loaded, arbitrarily-shaped helical groove slow-wave structure (SWS) are investigated for a thin annular electron beam. The “hot” dispersion equation is obtained by means of the self-consistent field theory, and the small signal analysis is carried out including the effects of the dielectric-rod parameters and the groove shapes. The numerical results show that the bandwidth of the helical groove TWT is expanded by loading dielectric-rod, however, the small-signal gain is reduced; and when the groove shape changes from the swallow-tail shape to the triangle shape, the working frequency increases , while the peak gain decreases. 相似文献
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To enhance the strength of beam-wave interaction and improve the performance of gain, the double-groove loaded folded-waveguide slow-wave structure (SWS) is proposed for millimeter traveling-wave tubes (TWTs). In the first part, the expressions for the dispersion and the interaction impedance of this novel structure are obtained by using matching conditions of the RF fields. Ansoft HFSS is also used to calculate the high frequency characteristics. The simulation results from HFSS agree with the theoretical results. Numerical calculation for different combinations of the groove width and depth is carried out to study the influence of groove loading on the properties of this novel circuit. In the second part, a linear theory of a double-groove loaded folded-waveguide TWT is developed and calculated for analyzing the effect of groove dimensions on the property of small signal gain. The investigation results indicate that the interaction impedance is obviously raised up and the small signal gain are enhanced by loading groove in the FWSWS. 相似文献
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The propagation of waves in a groove cell is analyzed. This propagation is a function of transfer matrix, which contains the gain, together with the phase constant, the length of a groove cell, and the groove reflection coefficient. When the transfer matrix is cascaded the transmission of an optical field and the reflection coefficient of a distributed feedback structure can be determined even with unequal grooves and any groove number. With the help of an eigenvalue equation the threshold gain and phase constant of the resonator modes are determined for a symmetrical laser. The increase of threshold gain is demonstrated for an inhomogeneous laser with changed mean value of effective refractive index along the laser length. Bloch waves exist in a long grating (or a closed loop) of periodic grooves 相似文献
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《Electron Devices, IEEE Transactions on》1982,29(10):1560-1570
A new recessed-gate structure for vertical-channel junction field-effect transistors (JFET's) is described together with a self-aligned gate-source process developed to fabricate these devices. Using this technology, devices with groove depths ranging from 8 to 18 µm have been fabricated. The characteristics of these devices is described as a function of the groove depth. It has been found that the devices display pentode-like characteristics at low gate voltages and triode-like characteristics at high gate voltages. The blocking gain has been found to increase with groove depth. However, this is accompanied by an increase in the on-resistance and a decrease in the saturated drain current. Devices with gate breakdown voltages of up to 600 V have been fabricated with the recessed-gate structure. These high-voltage field-effect transistors (FET's) have a unity power gain cutoff frequency of 600 MHz and gate turn-off times of less than 25 ns. 相似文献
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Qijun SunSoonmin Seo 《Organic Electronics》2012,13(3):384-387
Organic zero drive load inverters based on pentacene thin film transistors with periodic groove patterned dielectrics are fabricated using nanoimprinting and soft-contact lamination methods. Depletion mode transistor behavior is achieved when the current direction is parallel to groove direction and enhancement mode transistor behavior is achieved when the directions are crossed. An organic inverter is created after connecting two soft-contact laminated transistors. The electrical performance of the drive transistor can be varied and the organic inverter is tunable. This is done by utilizing a PDMS stamp with the source-drain electrode and changing the angle between the current direction and groove direction. The gain and symmetry of the VTC is improved by using an enhancement mode transistor where the source-drain electrode formed by thermal evaporation instead of being a soft contact-laminated device. 相似文献
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The sheet electron beam propagation over a rectangular deep groove grating is investigated and the interaction between surface harmonic waves, which are evanescent above the grating surface, with a dilute sheet electron beam is analyzed. It is assumed that a strong axial magnetic field is applied to constrain the motion of electrons along the waveguide axis. Under these conditions, a complex dispersion equation is derived and analyzed by using Taylor expansion. This expansion results in an analytical formulation for the gain. Using the derived analytical formulation of the gain, the effects of beam thickness, beam-grating gap, and characteristics of grating on gain is investigated. 相似文献
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对埋栅型SIT,为切断栅极和源极(或阴极)之间在外延过程中形成的连体,打开栅电极区,进行外延后的台面刻蚀,对台面刻蚀的深度和形状进行研究;为消除栅墙外划片边界造成的各种寄生效应,在有源区的外面挖深槽,以保证栅源击穿发生在内部、实现击穿接近理论值。对先刻蚀台面还是先刻蚀槽的问题做了实验对比,结果发现先台后槽更有利于器件特性的改善。 相似文献
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RFID天线通过贴片切角、挖方形槽以及接地板开十字形缝隙的方法来减小尺寸、实现圆极化和提高天线增益,通过对参数的优化仿真最终使天线轴比接近1d B,增益达到-0.69d B,尺寸比传统天线减小了21%,满足我国UHF频段的要求。 相似文献