共查询到19条相似文献,搜索用时 156 毫秒
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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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介绍了一种横向Ka波段宽带波导-微带探针过渡的设计,基于有限元场分析软件Ansoft HFSS对该类过渡的设计方法进行了研究。最后给出了Ka波段内的优化数据。仿真结果表明,该宽带波导-微带探针过渡在26.5G~40GHz内插入损耗小于0.065 dB,达到了设计目标。 相似文献
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计及自偏置环行器插入损耗过大,分别从铁氧体材料与器件设计两方面进行研究,以改善自偏置环行器性能。对取向W型六角铁氧体SrNi2Sc0.75Fe15.25O27(SrW)的磁性能进行了阐述,并基于SrW性能参数设计了Ku波段自偏置微带环行器。同时,论述了三角谐振器的环行原理、阻抗匹配原理,并进行了器件仿真分析。由仿真结果可知,自偏置微带环行器在12.4 GHz附近插入损耗为最小值0.51 dB,相应的隔离度为18.58 dB,15 dB带宽为0.94 GHz,电压驻波比小于1.22,表明该环行器在12~18 GHz实现了良好的环行性能。 相似文献
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报道了工作频率为1~1.5GHz宽带环行器的设计、仿真过程.产品实际达到的技术指标为:正向损耗α+≤0.4dB,反向隔离α-≥17dB,电压驻波比VSWR≤1.30,可通过1000W的脉冲功率(占空比20%),其外形尺寸为40x40x 18(rnm),工作温度为-40~70℃. 相似文献
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基于厚度为10 μm的钡铁氧体薄膜设计,制备了共面波导结构的毫米波薄膜环行器.这种薄膜环行器不需要外加磁体,在34 GHz和37.6 GHz显示出环行特性,其非互易效应大于15 dB.结果表明,采用共面波导结构可以实现薄膜环行器.这种薄膜环行器具有和单片微波集成电路集成的潜在应用. 相似文献
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波导-微带过渡电路是连接毫米波、太赫兹系统中平面电路与波导的重要结构,直接影响系统性能。设计了一种中心频率220 GHz的矩形波导-悬置微带线过渡电路。过渡采用探针耦合的形式,并使用渐变线结构实现宽带阻抗匹配,这种结构具有结构紧凑,易于加工,宽带和插入损耗低等优点。最终的仿真结果表明:在180~255 GHz的频带内回波损耗优于20 dB,插入损耗小于0.18 dB。这种结构可广泛应用于毫米波、太赫兹平面电路中。 相似文献
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《Electronics letters》2009,45(4):205-207
A novel broadband transition from a substrate integrated waveguide to a rectangle waveguide with an antipodal fin-line in its quasi-TE mode is presented. Impedance match and field mode gradual changing of transition circuits have been carefully analysed and performed. Experimental results show about a 1.6 dB insertion loss and greater than 12 dB return loss for back-to-back transitions over 10 GHz bandwidth from 26.5 to 40 GHz, so single transition insertion loss is about 0.8 dB. The transition is proposed for low-loss front-end circuits in the millimetre-wave band. 相似文献
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设计了一种基于光子晶体的结构紧凑、损耗低、频带宽的三端口三光路光环行器,该环行器由Y型光子晶体波导及配置在中心位置的磁光材料星形柱构成。通过对结构参数进行优化,该结构可以分别实现194~196GHz、198.2~199.4GHz和197~197.6GHz三个频段内稳定的顺时针单向环行传输,隔离度分别大于24、15.21和14.5dB,插入损耗分别小于0.18、0.11和0.38dB。该环行器结构简单,特别适用于结构复杂的光子集成系统,同时可提高光路的抗干扰性和稳定性等。 相似文献
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《Electronics letters》2009,45(3):168-170
A broadband transition between a half mode substrate integrated waveguide and a rectangular waveguide with an antipodal fin-line in its quasi-TEM mode is presented. Experimental results show about 1.3 dB insertion loss and below 215 dB return loss for a back-toback double transition over 10 GHz bandwidth from 26.5 to 40 GHz (the single transition insertion loss is about 0.65 dB). The transition may be used in low-loss and low-noise front-end circuits of the microwave and millimetre-wave bands. 相似文献
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《Microwave Theory and Techniques》1977,25(12):1048-1054
A new broad-band mixer capable of operating over two full adjacent waveguide bands (18 to 26.5 GHz and 26.5 to 40 GHz) is described. Within the octave bandwidth from 20 to 40 GHz, the maximum conversion loss is 6.5 dB with a corresponding average DSB noise figure of 5.7 dB. A theoretical analysis is given to treat quantitatively the performance of the octave bandwidth waveguide mixer. 相似文献
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W频段高阶模宽带波导Y结环行器 总被引:1,自引:0,他引:1
基于电磁理论计算,发现在W频段存在环行方向一致的双高阶结谐振模,两模相互邻近,可以用来制成双频环行器,也可以调整环行器参数使两模部分重迭,得到宽带特性.本文给出的实验结果验证了理论预言.双模部分重迭后给出8GHz的18dB隔离度带宽 相似文献
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In this paper, two novel broadband in-phase and out-of-phase waveguide power dividers with high isolation are presented. Based on the substrate-integrated waveguide (SIW) divider and SIW-to-waveguide transition circuit, two kinds of E-plane waveguide dividers have been implemented. Due to the features of in-phase and out-of-phase performances, the proposed waveguide dividers can provide much more flexibilities than that of conventional E-plane waveguide T-junction. A broadband phase and amplitude performances are achieved across the whole Ka-band owing to the wideband characteristic of the SIW divider and transition circuits. To minimize the size and loss of the divider, a compact and low-loss SIW-to-waveguide transition circuit has been developed using the antisymmetric tapered probes. Two prototypes of the Ka-band waveguide dividers, including the in-phase and out-of-phase types, have been fabricated and measured. Measured results show that the isolation, input return loss, output return loss, amplitude imbalance, and phase imbalance of the in-phase divider are better than 15.5, 13.1, 10.8, 0.4 dB, and 3.50, while those of the out-of-phase divider are better than 15.0, 13.4, 10.4, 0.5 dB, and 3.60, respectively, over the frequency range from 26.5 to 40 GHz. The measured results agree well with the simulated ones. Considering their wide bandwidth, high isolation, good port matching performance, and compact configuration, the two types of waveguide dividers can be good candidates for broadband applications in millimeter-wave waveguide systems. 相似文献
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基于混合微波集成电路技术(HMIC)设计了一种W波段小型化高频收发组件。该收发组件由固态发射机、环形器和接收机三部分组成。发射支路输入信号经过倍频放大后进入二选一开关,输出到天线自检口或经由环形器输出。为了实现高输出功率,该组件采用功率合成的设计思想,通过3 dB波导桥结构实现对两路功放的合成,解决了单个单片功率放大器的输出功率有限的问题。所设计的收发组件整体尺寸为125 mm×90 mm×26.5 mm。实测结果表明,在90~96 GHz工作频带范围内,遥测电压4.23 V。该收发组件的发射部分输出功率范围为33.6~35.4 dBm,开关隔离度大于110 dB;接收部分增益范围为30.2~33 dB,噪声系数小于6.5 dB。该组件具备良好的射频性能,同时实现了高集成度、大功率、高增益、高隔离度的要求。 相似文献
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A Ka-band microstrip circulator, using ferrite with 4π M=5000 G, have been developed. By optimizing the circulator configuration, broadband n=2 Chebyshev response performance are obtained over 7 GHz bandwidth. The circulator have isolation of greater than 15 dB, and insertion loss of less than 1.0 dB. 相似文献