共查询到19条相似文献,搜索用时 546 毫秒
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针对耦合波导缝隙馈电时波导内电磁场复杂且不利于工程应用的问题,提出一种耦合波导缝隙有源阻抗计算方法.根据耦合波导端口处S矩阵与端口处输入阻抗矩阵的关系建立关于耦合波导缝隙有源阻抗方程,且采用牛顿法求解此非线性高阶分式方程,得到计及缝隙间互耦的耦合波导缝隙有源阻抗值.通过提取HFSS软件中耦合缝隙馈电的裂缝天线S矩阵进行仿真计算,结果表明该计算耦合缝隙有源阻抗的方法是有效的且适合大型裂缝天线耦合裂缝设计. 相似文献
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本文提出了一种处理多端口耦合问题的有效方法。在该问题中,各端口波导分别通过一耦合孔与耦合区进行耦合。利用矩量法,首先导出了多端口耦合问题的关于传输模和截止模的等效导纳矩阵的计算公式。在此基础上,考虑到截止模加载于端口波导的特性阻抗,经过适当的矩阵运算,得到仅仅关于传输模的等效导纳矩阵。用此方法计算了一个 H 面 T 形接头的等效导纳矩阵和等效电路参数,所得结果与文献[1]们的结果非要吻合。 相似文献
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采用模式匹配法分析了H面阶梯的散射矩阵,通过等效电路法得到耦合系数以及等效电长度。为了将加工中倒角的影响考虑在内,使用阶梯近似,采用S矩阵级联的方法计算H面阶梯波导滤波器加工过程中倒角后阶梯的阻抗变换器值,并通过设计例子来验证该方法的有效性。 相似文献
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为弥补传统导波端口在处理辐射问题的缺陷,解决导波端口后向泄漏和远场外推面截断而导致的辐射失真等问题。该文深入研究时域有限差分算法中导波端口激励的加载方式,首次提出了一种通用有效的局域导波端口,并对端口中各边界条件的参数配置和实现方法进行了深入论述。此外,利用该算法对不连续性波导、微带贴片天线和波导缝隙天线阵等实际问题进行了模拟仿真,结果表明,在处理波导不连续性问题时,该方法保持很高的计算精度;在处理导波端口的辐射问题时,传统方法存在较大误差,新方法则能取得很好的计算结果。因此该方法不仅适用于模拟导波端口激励的辐射问题,也适用于分析各类波导不连续性问题,具有普适性。 相似文献
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文中基于波导并联缝隙的RLC 串联等效电路,建立了谐振阵阻抗带宽的通用分析方法,对单一过载和
过载匹配两种设计条件下谐振阵的最大带宽进行了研究,给出了最优带宽拟合公式并确定了相应匹配条件下的导纳特
性,系统解决了谐振阵阻抗带宽的设计边界与设计方向问题。最后结合缝隙等效电路,提出了一种新颖的导纳特性调
整方法,通过引入平行隔栅控制缝隙导纳的电容特性,利用过载匹配技术实现了8 单元中心馈电谐振阵的最大带宽设
计。全波仿真结果显示,VSWR≤1. 5 时的最大带宽可达到16. 2%,相应的电容参数C 为4. 9 pF,该结果与拟合公式得
到的电容参数C 及最大带宽计算数据较为一致,并且缝隙归一化导纳特性的全波仿真数据与等效电路优化出的最佳
导纳特性的吻合性非常好。最后设计了一个8×8 试验阵并展开了测试,该试验阵VSWR≤1. 5 时的工作带宽为16. 4%,
与全波仿真结果及等效电路分析结果均较为一致,证明了文中提出的谐振阵的带宽分析方法是准确可行的。 相似文献
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对于窄带波导滤波器而言,大直径电感销钉的准确分析及其等效电路参数值的准确选择至关重要,直接影响滤波器的带宽、插损、带外抑制度等关键指标。用矩量法对矩形波导内大直径的圆电感销钉进行了准确分析,并且进行了理论仿真。 相似文献
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基于戴维宁定理等效电阻采用实验方法求解中,当开路电压为零,短路电流也为零时,戴维宁等效电阻不能用实验方法确定以及戴维宁等效电阻为复阻抗时,其相位不能用实验方法确定的两个问题,针对前者采用电路分析的常规方法解决了这一问题;对第二个问题则采用实验辅助手段,多次测量电压、电流并对这些测量结果进行理论分析计算,解决了等效电阻为复阻抗的相位确定问题。丰富了戴维宁等效电阻开路、短路法的实验求解。 相似文献
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《Microwave Theory and Techniques》1970,18(9):638-642
A technique for the measurement of package parasitic and equivalent-circuit parameters of microwave semiconductor devices at the frequency of operation is presented. In this method a two-port coupling circuit is found which transforms the impedance measured in rectangular waveguide to the terminals of the equivalent circuit used to represent the semiconductor device. This approach combines known properties of radial transmission lines and of impedance measurement in the TE/sub 10/-mode full-height waveguide to obtain an analytical referencing technique for a diode mounted across a reduced-height waveguide. Application of this technique is illustrated by measurements of several varactor diodes. 相似文献
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《Microwave Theory and Techniques》1967,15(2):109-116
An exact method is developed for the calculation of the electrical performance of the rectangular waveguide T-junction. This method is used to find the equivalent circuit of a rectangular waveguide T-junction in which both cross-sectional dimensions of the side waveguide are different from the cross-sectional dimensions of the through waveguide. The theoretical calculations for a particular T-junction of this type are verified by experimental measurements. In this method the electrical performance is analyzed by using equivalent-circuit concepts applied to waveguide modes to calculate an admittance matrix relating propagating and cutoff waveguide modes to each other. Then the cutoff modes are terminated in their characteristic impedance, and an equivalent admittance matrix of the junction is found relating only the propagating modes in each waveguide to each other. The anlysis is valid when any number of modes can propogate in the waveguides forming the junction. The Inversion of an infinite matrix is required; however, any desired accuracy can be obtained by considering a matrix of finite but sufficient size or equivalently by considering a sufficient number of cutoff modes. 相似文献
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Characterized with full-metal structure, high output power and broad bandwidth, microfabricated folded waveguide is considered
as a robust slow-wave structure for millimeter wave traveling-wave tubes. In this paper, cold-test (without considering the
real electron beam) properties were studied and optimized by 3D simulation on slow-wave structure, for designing a 220 GHz
folded waveguide traveling-wave tube. The parametric analysis on cold-test properties, i.e., phase velocity, beam-wave interaction
impedance and cold circuit attenuation, were conducted in half-period circuit with high frequency structure simulator, assisted
by analytical model and equivalent circuit model. Through detailed parametric analyses, interference between specified structural
parameters is found on determining beam-wave interaction impedance. A discretized matrix optimization for interaction impedance
was effectively carried out to overcome the interference. A range of structural parameters with optimized interaction impedance
distributions were obtained. Based on the optimized results, a broadband folded waveguide with cold pass-band of about 80 GHz,
flat phase velocity dispersion and fairly high interaction impedance was designed for a 220 GHz central frequency traveling-wave
tube. A three-dB bandwidth of 20.5 GHz and a maximum gain of 21.2 dB were predicted by small signal analysis for a 28 mm-long
lossy circuit. 相似文献