卫星赋形天线矩形同轴线馈电网络的FDTD分析

采用时域有限差分（FDTD）方法分析了构成卫星赋形天线馈电网络（BFN）的矩形同轴线各种不连续性结构的散射特性。该方法通过模拟波的传播过程直接求解结构的散射参数,与模匹配方法相比,分析过程大为简化,将计算结果与实验值进行了比较,二者吻合很好,充分证明了本文方法的有效性和精确性。     

卫星赋形天线矩形同轴线馈电网络的FDTD分析

采用时域有限差分(FDTD)方法分析了构成卫星赋形天线馈电网络(BFN)的矩形同轴线各种不连续性结构的散射特性.该方法通过模拟波的传播过程直接求解结构的散射参数,与模匹配方法相比,分析过程大为简化.将计算结果与实验值进行了比较,二者吻合很好,充分证明了本文方法的有效性和精确性.     

一种双极化收发分离的波束波导馈电网络

传统波束波导馈电网络只具备单极化单向传输功能,难以满足应用发展需求。通过引入法拉第旋转器,结合平面镜、曲面镜、极化栅,设计了一个可实现收发分离的双极化共反射面波束波导馈电网络,该馈电网络分水平极化发射/接收、垂直极化发射/接收四个通道。仿真验证了该波束波导馈电网络的工作原理,给出了94.05GHz时馈电网络远、近场分布,实验测试了馈电网络各通道插入损耗,结果表明该馈电网络具有波束一致性好、通道损耗低的特点,可用于空间波束传输。     

双波束天线馈电网络组合设计

根据某双波束询问器天线单元激励幅度和相位的要求，对网络形和网络馈电方式进行了选择。组合分析设计了具有和差输入和双输入口民网络，给出设计及测试结果。     

一种赋形波束高增益微带天线

对于X波段垂直半全向天线,用传统的振子型天线实现较为困难,分析了一种用两片矩形微带串馈单元组合而成的阵列天线的阻抗和辐射特性,通过优化设计两单元天线的夹角和间距,实现了H面180°的宽波束设计,且在波束范围内的电平变化小于3dB,垂直方向3个单元串馈后得到天线的增益达10dBi。天线结构简单,性能良好,实际的实验结果和理论计算吻合较好。     

一种新式串行馈电同时多波束微带天线的设计

针对较大规模的串行馈电Blass多波束网络设计的复杂性,通过减少90°耦合器的种类提出了一种简化的设计方法,利用该方法给出了一种新式的微带线结构串行馈电同时多波束网络,并以S频段同时两波束的天线为例进行了设计验证。重点设计了串行馈电同时两波束网络的结构以及馈电网络关键的组成单元90°耦合器,并对简化带来的误差进行了重点的理论和仿真分析,设计了与馈电网络匹配的天线阵。对设计好的两波束天线进行了实物加工和测试,测试结果与仿真结果吻合较好,验证了设计的正确性。     

TD智能天线广播波束赋形与网络优化

文章在对智能天线的基本功能、基础（电磁场叠加原理和智能天线权值）、特点进行介绍的基础上,分析了TD智能天线广播波束赋形与网络优化,指出TD-SCDMA智能天线可以通过软件设置任意改变广播权值,迅速得到典型三扇区蜂窝组网最优的扇区覆盖及与场景最优覆盖的广播波束,甚至对重要场景（热点地区）作个性化快速设计。     

一种计算赋形天线增益下降的简单方法

基站天线常采用赋形技术,以提高通信质量和减小对邻区的干扰,但采用赋形技术会导致天线的增益下降,通过方向图积分方法来计算和评估赋形天线的增益下降,计算过程复杂。介绍了一种通过分析基站天线接收信号过程中馈电网络功率合成的方法,只需几步简单的运算即可得出赋形基站天线的增益下降情况。     

一种双层赋形波束形成网络的设计

提出了一种双层空气板线结构赋形波束形成网络的设计方法,包括赋形波束的综合和关键单元的设计,讨论了该种网络在具体工程实现中的设计考虑,给出了样件的实验结果。通过对比发现,该网络的测试曲线与理论曲线甚相一致。     

赋形波束天馈一体化设计

随着雷达机动性的要求越来越高,对加装于一次雷达上的二次雷达的重量限制提出了更高的要求.俯仰线阵作为使用数量最多的设备,降低其重量显得尤为重要.文中探讨了一种大尺寸的天馈一体化设计技术,介绍了网络的模型及设计中的几个关键点,然后,给出了实测结果,按此方法设计的线阵已大批量装机.     

Phase Step Beam Waveguide

Experimental tests on a new type of beam waveguide constituted by a series of equispaced dielectric frames are described. Field-pattern and power-loss measurements have been performed on short-circuited sections of the waveguide working at 10 GHz and on the 37-GHz prototype constituted by Teflon square frames. In comparison with the more common iris and lens beam waveguides, it presents advantages concerning diffraction, reflection, and dissipation losses. In addition, it is lightweight and compact. The experimental results confirm these advantages, along with a low sensitivity to assembling and constructive imperfections. Design criteria are suggested as a result of the optimization for the lowest losses obtained through numerical computations performed on the equivalent open resonator.     

The Reflecting Beam Waveguide

In this paper a type of beam waveguide which uses appropriately shaped metal reflectors instead of dielectric lenses as the phase correcting devices is described. A theory has been developed which, subject to certain restrictions, describes the modes of this type of beam waveguide and predicts a loss of the order of 0.01 db per iteration. A reflecting beam waveguide comprising eight aluminum reflectors has been investigated at a wavelength of 4 millimeters. The measured loss per iteration is approximately 0.015 db which is in good agreement with the theoretical value. The cross-sectional electric field distribution has also been measured and found to be in satisfactory agreement with the theory. It is shown that the reflecting beam waveguide is a practical system for the transmission of power at submillimeter wavelengths.     

Finite-Element Analysis of H-Plane Waveguide Junction with Arbitrarily Shaped Ferrite Post

A numerical approach for solving the problem of H-plane waveguide junctions with Iossy ferrite posts of arbitrary shape is proposed. The junctions are allowed to have arbitrary cross section. The approach is a combination of the finite-element method and the analytical method. To show the validity and usefulness of tbe method, Y-junction circulators with a circular ferrite post are considered. Our results agree well with earlier experimental and theoretical results. The performances of Y-junction circulators with a triangular equilateral ferrite post or a triangular ferrite post having depressed sides are investigated. The influences of the ferrite losses on the performance are examined.     

一种赋形阵列天线的优化设计

给出一种S 波段波束赋形阵列天线的优化设计过程,由带状耦合结构的印刷阵子天线并排组成16 元直线阵列。为使天线的辐射波束达到给定方向图的主瓣和副瓣要求,采用联合应用DFP 和BFGS 公式的变度量优化算法,对阵列天线各单元的馈电幅度和相位同时进行优化,并考虑阵列中各单元之间的互耦对阵列的影响,通过全波电磁仿真软件HFSS 进行了验证,所得的方向图与理论计算十分吻合。根据仿真优化的结果,制作了天线阵实物并进行了测试,得到的测试结果与仿真结果一致。     

应用高斯波束理论设计波束波导天线

以高斯波束理论为基础,根据天线基本参数要求,分析确定出波束波导系统中各反射面尺寸、反射面彼此间距及各部件相对位置。以此系统为实例,给出各个反射面处高斯波束特征参数值,并分析比较了反射面之间距离、反射面辐射口径等参数对截获效率的影响。波束经过两反射面反射后均会产生交叉极化模,给出计算反射效率公式,得出结论为:两反射面姿态对称条件下彼此产生的交叉极化模可以互相抵消。     

Loss Measurements of the Beam Waveguide

The diffraction loss of a new low-loss waveguide for millimeter and shorter wavelength, called the beam waveguide, was measured. The loss measurements were made using a resonator technique. The beam waveguide resonator derived from the beam waveguide consists of confocal paraboloids and is itself a very useful millimeter and sub-millimeter wave circuit component having already found application in some optical masers. Measurements made to determine the reflection loss of the resonator end plates also resulted in information on the loss of 90/spl deg/ bends in the beam waveguide. The results of the loss measurements made on the beam waveguide, in the frequency range near 9 Gc, are in good agreement with theoretical values given by Goubau.     

微带串馈赋形波束阵列天线设计

利用阵列天线的不均匀性可以实现对辐射单元幅度和相位的控制以达到特殊波束赋形目的。传统设计中,基本没有考虑微带不连续性对微带传输线长度的影响。本文采用仿真方法获得了微带贴片单元的等效参数,综合考虑了微带不连续性对贴片单元长度以及贴片间传输线长度的影响,设计了双层X波段32元串馈矩形微带贴片阵列天线,实现了余割平方赋形波束。运用电磁仿真软件CST对该阵列天线进行仿真,制作了天线实物并进行了实验,结果与预期指标吻合较好。