共查询到17条相似文献,搜索用时 234 毫秒
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相控阵雷达中宽带波导和差网络的研究 总被引:1,自引:1,他引:0
介绍了一种由4个宽带波导魔T级联而成的X波段宽带和差网络.采用一种改善宽带波导魔T频率特性的新颖方法,在波导魔T的E面上级联变换段和H臂上增加电感膜片,得到40%带宽内优异电性能.并通过理论分析、三维电磁仿真构造了具有同样优异性能的宽带波导和差网络.最后,给出了波导魔T和波导和差网络的实测结果. 相似文献
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《电子元件与材料》2018,(2):50-54
提出一种宽频带、小型化单脊波导功分器结构。分支波导采用标准单脊波导,在维持较高功率容量的条件下拓展了传输模的主模带宽。在T型结处设置一容性金属平板与分支单脊波导相接构成一个宽带电抗性调谐元件,在主模带宽拓展的情况下有效地实现了T型结的宽带匹配。为了能够与标准器件连接,设计了单脊波导-标准矩形波导转换器件,采用多级阶梯匹配的形式使转换器件的阻抗带宽与T型结保持一致。利用高频仿真软件HFSS进行仿真优化,结果显示该功分器在25~40 GHz频率范围内,回波损耗小于–20 d B,信号波动优于0.04 d B,相对带宽为46.2%,实际内部尺寸比标准波导功分器减少38%。该单脊波导功分器具有低损耗、小型化和宽频带的优点,可以广泛应用于雷达、天线以及功率放大器等微波设备。 相似文献
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提出了一种可以应用于电子战的双脊波导魔 T 接头,介绍了它的基本原理,运用模式匹配和迭加的方法,对双脊波导魔 T 接头进行了分析和计算,设计了一种新型的双脊波导魔 T 接头.它不仅工作频带比标准波导魔 T 宽很多,而且结构尺寸大大减小,实现了宽频带功率分配器、合成器和射频电子开关的功能.实物测试的结果表明其性能良好. 相似文献
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和差网络是毫米波单脉冲雷达前端中的一个重要器件,设计了一种由四个阶梯型波导魔T组成的Ka波段和差网络。相比于传统的波导匹配魔T,该新型魔T由于采用了阶梯型过渡匹配结构,抗振动能力较好。四个魔T按一定方式排列和连接,以使和差端口成一直线分布,四个接收端口成"十"字型分布,易于系统集成。通过三维电磁仿真软件优化设计,在34 GHz~36 GHz范围内,和差器各端口回波损耗大于15 d B,当和端口激励时各输出端口的幅度一致性小于0.1d B、相位一致性小于5°。最后,给出和差网络的实物测试结果,并与仿真结果对比。 相似文献
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介绍了一种基于LTCC 技术的脊基片集成波导(SIW)到微带的过渡结构。将传统脊波导到微带过渡的设计思路,运用于基于LTCC 技术的基片集成波导(SIW)到Rogers5880 基片微带的过渡设计中,实现了LTCC SIW 到Rogers5880 基片微带的宽带过渡。从仿真结果可以看出,在25.2GHz 到40GHz 的频带内,回波损耗S11 小于-15dB, 插入损耗优于-0.2dB。 相似文献
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提出一种不通过波导脊背与微带导带接触来实现脊波导-微带射频信号过渡的新型电路,具有工作频带宽、插入损耗小、电性能稳定等优点,非常适合工程应用。通过对该非接触式脊波导-微带过渡与Lange 电桥进行理论分析与仿真计算,提出了一种可覆盖C/ X/ Ku 频段的宽带功率合成方法,并按照该方案在6 ~18 GHz 频段内设计了一种以脊波导为射频端口的高效率2 路功率合成放大器。实测结果表明,6 ~18 GHz 频率范围内的无源合成效率高于87%。采用该电路将典型输出功率12 W 的2 只MMIC 的输出功率合成,在6 ~18 GHz 频率范围内得到了高于20 W 的饱和功率输出,附加效率最高可达28. 9%。该宽带功率合成放大器以脊波导为接口,不但功率容量大,且便于采用脊波导功率合成器进行高效率二次合成,为6 ~18 GHz 更大输出功率的固态功放研制提供了解决方案。 相似文献
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为了满足某宽带发射机系统的需求,需研制全Ka波段(26.5~40 GHz)的宽带波导结环行器。本文采用Y形脊波导中心结形式,多级切比雪夫阶梯阻抗匹配器实现环行器宽带阻抗匹配,利用HFSS优化环行器结构。设计的环行器实验结果为:在26.5~40 GHz范围内,插损不大于0.45 dB,隔离不小于19.5 dB,驻波不大于1.4,通过60 W平均功率实验。 相似文献
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为了满足某系统的要求,需研制带宽在X波段达4GHz(40%)的宽带波导结环行器。文中采用Y形脊波导中心结形式,采用三阶等宽切比雪夫阶梯阻抗匹配器实现环行器宽带阻抗匹配,并利用HFSS软件优化环行器结构。设计的环行器实验结果为:在8.4GHz至12.4GHz范围内,插损不大于0.3dB,隔离不小于20dB,驻波不大于1.2。环行器设计结果与实验结果基本一致,表明该设计方法正确,设计的环行器满足系统宽带要求。 相似文献
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The optimal input impedance and noise of a DC SQUID RF amplifier at frequencies of the order of 1 GHz with a resonant input matching circuit have been studied analytically, numerically, and experimentally. A model for noise temperature and power gain has been developed for the practical resonant input tank circuit. A new effect of the output noise increasing or decreasing with changing the sign of voltage-to-flux transfer coefficient has been observed experimentally and explained analytically. The different values of noise temperature for the opposite dV/dΦ values have been interpreted using a model with partially correlated current and voltage noise sources. The equivalent layout for optimal input matching of a SQUID amplifier comprising series and parallel resonant circuits has been presented. Using such a matching circuit and SIS junction as a signal source the SQUID amplifier noise temperature about 1 K has been measured at 1.1 GHz 相似文献
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J. W. Kooi M. S. Chan M. Bin Bruce Bumble H. G. LeDuc C. K. Walker T. G. Phillips 《Journal of Infrared, Millimeter and Terahertz Waves》1995,16(2):349-362
We report preliminary development work on a 850 GHz SIS heterodyne receiver employing a tuned niobium tunnel junction on a 1 µm Si3N4 supporting membrane. Since the mixer is meant to be operated well above the superconducting gap frequency of niobium (2δ/h ? 690 GHz) special care has been taken to minimize transmission line loss. We have therefore used junctions with an integrated radial stub RF matching network to tune out the large shunt susceptance of the junction and minimize the niobium film absorption loss. Scale model measurements of the waveguide embedding impedance have been made to aid in the design of the choke structure and RF matching network. Detailed Fourier Transform Spectrometer measurements of tuned junctions on both SiO2 and silicon nitride membranes show response up to 1100 GHz and indicate that the absorption loss in the niobium film is in the order of 4–7 dB at 850 GHz, in fairly good agreement with the theoretical loss calculated from the Mattis-Bardeen theory. The junctions have a center frequency of 800 GHz which presents a 6% downshift from the designed value. 相似文献
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《Microwave Theory and Techniques》1961,9(3):216-219
The five-port matched pseudo-magic tee consists of an input waveguide, two load arm waveguides which are coupled into the input waveguide with +90° and -90° phase shifts, respectively, and an output waveguide which is split into two load waveguides by a septum. The improvements include a much broader matching and isolation bandwidth, higher isolation between arms, better matching into arms, and a variety of modifications for different applications. These characteristics have been obtained by employing frequency-insensitive phase shifters. Hence, frequency coverage is mainly limited by mechanical asymmetry and the characteristics of the directional coupler in the magic tee. While this type of hybrid junction is not a true magic tee because the load arms are not used as the input arm, it does have several applications which an ordinary magic tee does not have. X-, K-, and M-band models were examined experimentally, and highly sensitive and accurate impedance measurements were made. 相似文献