S参数法设计波导E面金属插片窄带滤波器

文章采用高精度的模式匹配法设计了一种窄带矩形波导E面金属插片滤波器。利用该方法设计的滤波器具有精度高,结构简单,制作方便,通带插入损耗小,阻带衰减大等优点。将使用模式匹配法的数值计算结果与实验结果相比较,两者吻合良好。     

基于CCPT的波导E面带通滤波器的分析和设计

利用复功率守恒法(CCPT)分析了波导纵向E面金属插片,得到了插片基本单元的广义散射矩阵公式。针对经典低通滤波器原型,不能获得较宽带宽的带通滤波器的设计,本文基于半波分布阶梯阻抗滤波器原型求得归一化阻抗倒置器值,编写了波导E面带通滤波器CAD程序,设计了几只宽带和窄带的带通滤波器,所得结果与其它方法吻合。     

波导E面偏置金属插片宽带滤波器

本文导出偏置波导E面金属插片的等效电路参数，该结构可用于实现较宽频带的带通滤波器。由此可分析对称结构设计的滤波器当加工或安装产生不对称时其选频性能的变化。     

波导金属插片窄带滤波器的研制

采用高精度的模式匹配法设计了一种窄带矩形波导插片滤波器。利用该方法设计的波导型滤波器精度高,结构简单,便于加工。同时将模式匹配法的数值计算结果与实验结果进行了比较,两者吻合的很好。     

V波段波导短截线带通滤波器设计

设计和分析了V波段E面波导短截线带通滤波器。利用E面波导短截线带阻滤波器的通带-阻带特性与矩形波导的高通特性相结合,将波导短截线带阻滤波器嵌入WR-15矩形波导中,设计具有高阻带抑制性能、过渡边带陡峭、宽阻带范围的V波段宽带带通滤波器。采用"场"、"路"相结合的方法设计的带通滤波器,仿真与测试结果吻合较好,验证了该设计方法的有效性。经测试实现了18%的1 dB带宽,在50.0～57.8 GHz通带内插入损耗≤1 dB,阻带频率58.9 GHz处抑制为43.6 dBc。     

应用于LMDS射频子系统中的一种矩形波导双工滤波器设计

LMDS(本地多点分配业务)是一种微波宽带技术，是解决“最后一公里”问题成本较低、功能较丰富的一种。本文设计了一种可用于LMDS中的采用加方形脊T形结的微波矩形波导双工器。介绍了矩形波导E面金属膜片滤波器的设计方法，这种滤波器的金属膜片可通过蚀刻等方法加工，加工精度高，成本低。对应用于双工器中的矩形波导H面T形结的特性进行了分析。     

用全波边界轮廓模匹配法精确分析矩形波导中任意形状H面E面的不连续性

本文给出了一种精确的边界轮廓模匹配法(BCMM),用于矩形波导中任意形状的H面和E面不连续性,接头和障碍物的模态散射矩阵的有效计算。对于非均匀的普通轮廓的波导区域,场被展开成一组完备的柱面波函数。全波展开允许直接精确的包括诸如组合H面和E面弯头的串联结构。该方法的有效性被精确设计的有用波导元件所证明,这些元件迄今还不能用模匹配法设计,如有圆柱形补偿棒的H面T形接头,任意角度斜接的H面和E面弯头,圆形耦合柱的滤波器,带有四角的E面滤波器,180°环形电桥结构,边耦合的TE_(311)/TE_(113)双模滤波器。该理论由测量结果所验证是正确的。     

矩形波导中左右手材料光子晶体的色散特性研究

研究了在矩形波导E平面填充的一维周期或准周期左右手材料光子晶体中电磁波的色散特性。采用传输矩阵法推导出一种适用于任意一维光子晶体E面填充矩形波导的2×22×2阶特征矩阵。定量分析了周期光子晶体中单元结构的重复次数、光子晶体的排列方式(周期,斐波那契,Thue-Morse和Octonacci排列)、及左手/右手材料介电常数等变量的改变对纵剖面电模式(LSE)色散特性的影响。结果表明,在矩形波导E面填充一维左右手材料光子晶体可以实现带隙特性,并且带隙的宽度和频谱位置受到左右手材料的介电特性及光子晶体排列方式的影响。该结构支持2个通带,一个是高于基模截止频率的正向波传播频带;另一个是显著低于基模截止频率的后向波传播频带。因此,在矩形波导E面填充左右手材料光子晶体为小型化波导和小型化滤波器的设计提供了新的思路。     

基片集成波导双感性柱滤波器的研究

采用模式匹配法设计了双排正方柱金属销波导带通滤波器,然后利用经验公式将正方柱等效成圆柱.在此基础上又利用基片集成波导和普通矩形波导之间的转换公式,将普通波导滤波器改用基片集成波导结构来实现,滤波器采用双排金属过孔结构使所设计的滤波器具有良好的带外抑制特性.且结构简单、成本低廉,便于加工,适合批量生产.设计结果的HFSS仿真验证了模式匹配法的精确性和经验公式的可靠性.     

矩形波导不连续性的有限元分析

本文应用Gelerkin有限元法对矩形波导H面和E面不连续性问题进行了研究,编制了一个通用的计算机程序.对矩形波导H面弯曲、E面弯曲以及T型结头进行了计算机辅助设计,理论计算与测试结果吻合很好,证明了本文方法的正确性.     

毫米波E面膜片滤波器的加工误差研究

E面膜片滤波器由于结构简单、高Q值、滤波特性好、设计精度高、易于批量生产等优点,在毫米波雷达系统中得到广泛应用.文中对E面膜片滤波器进行了理论分析,利用误差合成法以及数据模拟仿真,研究了Ka波段E面膜片滤波器中,膜片厚度、膜片安装、膜片长度在不同加工误差下,对滤波器系统性能S参数的影响,为其加工制造提供理论指导.     

A rigorous cad of millimeter wave bandpass filter with all-metal insert in waveguide

In this paper, a bandpass filter with all-metal insert, an inductive strip in the E-plane of a waveguide is analyzed by a prototype filter and the scattering matrix of the strip is calculated by electromagnetic fields theory theoretically. By means of matrix combining technique, the scattering matrix of a bandpass filter of this type is obtained. And a rigourous error function is used to optimize the CAD program by Powell's method and make the experimental results agree well with the theory design at V-band.     

E 面金属膜片波导滤波器的优化设计

本文利用等效电路的方法求得E面全金属膜片波导滤波器的初始尺寸值 ,经过对此滤波器的特性的分析结果与设计要求的比较对滤波器的尺寸加以调整 ,从而准确、快捷地完成滤波器的综合 ,对于E面金属膜片滤波器的工程设计有很大的帮助。     

波导E面金属片滤波器的优化设计

本文采用模式展开方法,导出了波导E面金属片滤波器的散射参量,进而编写了滤波器优化设计程序,设计、制造和测试了一个长三厘米滤波器,实验结果和理论结果符合得很好。本文方法考虑了高次模式通过谐振腔发生的耦合,设计的滤波器特性比较理想,在频率的低端和高端阻带衰减都较大,所以比采用变分原理导出等效网络参数然后进行综合设计的方法优越。     

Magnetically tunable rectangular waveguide E-plane integratedcircuit filters

A rigorous field theory method is described for the computer-aided design (CAD) of magnetically tunable E-plane metal-insert filters, where the waveguide sections are symmetrically loaded with ferrite slabs, and for large-gap finlines filters on a ferrite substrate. The design method is based on field expansion in suitably normalized eigenmodes which yields directly the modal scattering matrix of all discontinuities. The theory includes both higher-order mode interaction and the finite thickness of the metal inserts. Optimized data are given for magnetically tunable Ku-band metal insert and finline filter examples. The metal-insert type achieves a tuning range of its operating midband from about 14.1 to 15.7 GHz. The theory is verified by measurements     

A simplified CAD of millimeter-wave diplexer with E-plane T-junction and all-metal insert filters

An equivalent circuit theory design of a class of rectangular waveguide E-plane T-junction diplexer with E-plane all-metal insert filters is presented. Element values of equivalent circuit models of E-plane T-junction proposed in [1] are computed and approximated. The parameters of the filters designed by [2] are also given. By use of the network combining technique, the scattering matrix of the diplexer is obtained and optimized according to the diplexer specification with a novel objective function. The experimental results show a fairly good agreement with the computed results.     

A Novel E-Plane Waveguide Filter with Three Metal Irises

This paper presents a novel E-plane rectangular-waveguide filter with three metal irises in Ka bard. Comparing with the conventional E-plane waveguide filter with single iris, a great improvment has been made in stop-band of a band pass filter, and wider pass band compare to normal double metal irises waveguide filter. An analysis is given by mode match method and the conservation of complex power technique [1]. Computer-aided design of a new five-resonator Ka band band pass filter has been presented, good agreement has been observed between theory and measurement data.     

Ku-band high-power lowpass filter with spurious rejection

A Ku-band high-power lowpass filter with spurious passband suppression up to 40 GHz is proposed in rectangular waveguide technology. The new design consists of a conventional E-plane corrugated lowpass filter cascaded with a quasi-periodic structure tuned to reject the undesired spurious passbands. This new design technique allows the minimum gap of the original corrugated filter to be kept wide enough to permit high-power operation