共查询到18条相似文献,搜索用时 234 毫秒
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扩展相互作用速调管(EIK)由多个重入式多间隙耦合腔构成,毫米波段高功率微波源的需求推动了Ka波段EIK的研制.分别利用等效电路理论和场分析方法推导了由三个同样间隙构成的三间隙耦合输出腔间隙阻抗实部的计算公式,然后应用等效电路方法获得了滤波器加载宽频带输出回路的基本参数,应用场分析方法设计了冷测带宽达4.6%的滤波器加载三间隙耦合输出腔结构,为宽频带EIK的研制打下坚实的基础. 相似文献
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该文介绍了一种超宽带双信道速调管输出回路的设计思路和实现过程。以Ansoft HFSS软件为设计平台,在S波段设计出一个带宽超过550 MHz的超宽带双信道双间隙耦合腔输出回路。设计了信道转换机构,并分别确定了两个信道的谐振腔参数。得出了不改变两个谐振腔参数,只需调节耦合槽的尺寸就能够实现信道转换的结论。通过对HFSS软件建立的模型进行计算,得到了双间隙耦合腔输出回路中各模式的频率,与冷测结果基本一致。利用集中元件等效电路法计算了双间隙耦合腔输出回路的间隙阻抗,计算结果与冷测结果基本一致。 相似文献
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设计了适用于多注速调管,工作在TM310高次模圆柱形谐振腔耦合矩形波导输出回路,其工作中心频率为7 585.3 MHz,计算了腔体内各漂移管间隙阻抗的频率特性,并分析了输出回路的输出带宽.研究结果表明: 在相同频率条件下,采用圆柱形TM310工作模式的谐振腔体积将是采用圆柱形TM010工作模式谐振腔体积的7倍;TM310高次模圆柱形谐振腔耦合矩形波导后,各漂移管特性阻抗与耦合前相比有稍微变化,但耦合后各间隙特性阻抗非常接近;反射系数相位法及等效电路法计算输出腔外观品质因数分别为为154和160,输出中心频率7 585.263 MHz,比耦合前腔体谐振频率降低26.525 MHz,输出带宽约为3%,因此,该类型输出回路比较适合用作高射频段的窄带多注速调管. 相似文献
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为了在较低泵浦功率下实现单纵模双波长激光信号的输出,进而获得窄线宽的高频微波信号,设计并实验了一种基于复合滤波结构的窄线宽高频微波信号产生装置。通过8字腔结构布里渊增益腔和反射式光纤光栅构成的波长选择滤波器实现了4倍布里渊频移间隔的双波长斯托克斯光信号输出,采用200 m长单模光纤作为增益介质,同时与50 m长单模光纤构成级联光纤环结构,采用三端口耦合器与2 m长未泵浦的保偏掺铒光纤构成萨格纳克环结构,利用级联光纤环结构和萨格纳克环结构的复合滤波作用实现了斯托克斯光信号模式的选择,使输出的斯托克斯光信号由多纵模运行状态变为单纵模运行状态。实验证明:通过对输出的单纵模双波长斯托克斯光信号进行拍频检测可得42.85 GHz的高频微波信号产生,线宽为38 kHz;通过改变可调谐泵浦激光器的输出波长,可实现42.25~43.51 GHz范围内的频率调谐;通过稳定性测试,产生的42.85 GHz高频微波信号的频率变化在0.83 MHz内,峰值功率变化在±0.8 dB内,稳定性良好,满足实际应用需求。 相似文献
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单纵模多环形腔掺铒光纤激光器及其稳定性 总被引:3,自引:2,他引:3
介绍了一种多环形腔结构(MRC)的单纵模(SLM)掺铒光纤激光器(EDFL).这种激光器通过在主环形腔中插入充当模式滤波器的三个长度不等的无源次级环形腔,并结合腔内光纤布拉格光栅(FBG)形成多环形腔掺铒光纤激光器结构,多环形谐振腔可保证激光器的单纵模输出。讨论了使激光器运行在单纵模状态的谐振腔理论。同时,为了提高系统输出的频率稳定性,采用外光注入方法有效地抑制了模式跳变和拍噪声,改善了输出谱特性。实验得到在1550.225nm处输出功率约3.6dBm,信噪比(SNR)>35dB的单纵模输出光,且测得线宽小于500Hz. 相似文献
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研制了一种新型的混合式反同轴磁控管。其频率为3.2千兆赫、脉冲功率达千兆瓦,脉宽为30毫微秒。最初的测试就达到了0.5千兆瓦的脉冲功率和20%的效率。这种管型与普通反同轴磁控管不同,它的可调稳频腔在输出圆波导的外围。在稳频腔的外壁上有54个翼片,构成54个径向分布的阳极谐振腔。慢波系统与稳频腔之间的耦合隙缝迫使在电子互作用空间有π模振荡。选用这种结构后,使互作用空间可达到的功率流显著增加,同时高频真空击穿的可能性却减小了。由于在场致发射的阴极表面有了起动电路,提高了脉冲前沿的模式稳定性。 相似文献
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《Microwave Theory and Techniques》2000,48(10):1771-1774
It is shown that the broad-band coupling properties of narrow-wall short-slot directional couplers and hybrids are due to the effect of the evanescent TE30 mode in the coupling region. This causes a change to the effective phase length of the even-mode circuit, especially when a central tuning element is used. Using the results of a previous paper on the formation of an equivalent circuit from the generalized scattering matrix, an equivalent circuit for the even mode of the coupler is formed, clearly depicting the effect of the TE30 mode 相似文献
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This paper presents the modeling and optimization of compact microwave bandpass filters whose compactness leads to complex and strong stray coupling paths, thereby making the identification of a simple and sparse coupling topology difficult and even impossible. The strong coupling coefficients needed for a broadband response can also cause an ambiguity in identifying the spatial extent of local resonances. An equivalent circuit, which is extracted directly from Maxwell's equations, is used in optimizing these filters. The filter is represented by its global resonances instead of individual resonators. The extraction of the parameters of the equivalent circuit is carried out in the physical frequency and not in the normalized frequency in order to preserve the physicality of the equivalent circuit, especially for asymmetric responses. The technique is successfully applied to the optimization of second-order suspended stripline bandpass filters with one transmission zero either below or above the passband, as well as fourth-order filters with three transmission zeros. A fourth-order filter with three transmission zeros is fabricated and measured. 相似文献
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Analysis and simulation studies of the longitudinal mode behavior of two-section coupled-cavity lasers in the steady-state are presented. The laser is analyzed with a resonance amplifier model and the scattering matrix formulation. The mode selection property of this laser is explained in terms of the wavelength-dependent effective reflectance. Expressions for the effective reflectance and the mode power are derived for two different cases: the case of weak reflection from the junction and strong coupling between individual cavities, and the case of strong reflection at the junction and relatively weak coupling between cavities. It is shown to be possible to simulate the longitudinal mode behavior with respect to temperature changes and wavelength tuning by separately pumping each section of the laser. 相似文献
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《Advanced Packaging, IEEE Transactions on》2009,32(3):636-643
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Determining the coupling of electromagnetic fields into cavities via slots can be complex. This letter presents a simple technique of achieving this. The method utilises a superposition of coupling via a series of circular apertures that represent the equivalent slot. The series of apertures are all transposed to single position allowing the slot to be represented by a single circular aperture. A model for coupling via a slot is realised using intermediate level circuit modelling that yields credible results and is validated against a transmission line matrix model. 相似文献
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A lumped equivalent circuit model for both series and double-shunt (butterfly) connected radial stub has been developed. The model-simple and effective-not only includes conductor and dielectric losses but also radiation ones, which play an important role in microstrip circuit elements. Experiments widely demonstrate its suitability for implementation in available CAD (computer-aided design) programs. Furthermore, a synthesis procedure for using radial stubs in circuit design is described. An application of the proposed design procedure and simulation tools in the development of very broadband nongrounded termination is also presented 相似文献
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Lu Xiaohou 《电子科学学刊(英文版)》1984,1(1):36-45
From the lumped circuit elements point of view, the distribution of gap interaction impedance coefficients of resonant coupled
cavity output section of broadband klystrons is analyzed.
The following topics are discussed: (1) the selection of equivalent circuit; (2) the calculation of impedance distribution
with given parameters of the lumped circuit element; (3) the calculation of transfer impedance and microwave circuit parameters
with measured self-impedances. 相似文献