A novel e - plane metal insert waveguide filter is presented in this paper . comparing to conventional e - plane waveguide filter , great improvments have been made in stop - band attenuation of a bpf 为了提高e面全金属膜片矩形波导滤波器的阻带性能，本文对滤波器的结构做了改进，采用了混合膜片的形式。
Based on former researchers " works , artificial neural network method is introduced to the analysis of electromagnetic stop band structure to fulfill fast analysis in this dissertation 本文所做的工作就是在前人研究工作的基础上，将人工神经网络方法引入到电磁阻带结构的分析中，实现它们的快速分析。
Bessel function design simulation results show the small pass - band ups , stop - band attenuation , in the pass - band with a better group delay characteristics , which can meet the design requirements 仿真结果表明贝塞尔函数设计的滤波器通带起伏小，阻带衰减大，在通带内群延迟特性较好，可以很好满足设计要求。
3 . dimension and configurations explosion - proof sheathed thermal resistance with special thermowell in textile and chemical fibre industry explosion - proof sheathed thermal resistance with special thermowell model : t - wzpk - 240 t - jx04a 纺织化纤部门专用隔爆铠装电阻带特制套管隔爆铠装热电阻带特制套管型号： t - wzpk - 240 t - jx04a
Three types of artificial neural networks , namely radial basis function network , feedforward network , stochastic network , and their application in the analysis of electromagnetic stop band structure in coplanar waveguide have been discussed 本文研究了以下三种人工神经网络：径向基函数网络、前向网络、随机网络，并用于分析共面波导中的电磁阻带结构。
Thirdly , two kinds of the methods to improve the performance of filter stopband has been discussed . these methods are used to cleared up the influence of the parasitical passband . through the simulation and test result shows that these methods " s performance is expected 第三,论了2种对滤波器阻带抑制进行改善的方法,以消除寄生通带的影响,通过仿真和实际制作滤波器的测试结果。
Applying the method of this article , we can get that the attenuation of stop - band is - 75db and the error of reconstruction is 0 . 0015 . the simulation program and experiment result are provided . the correctness and validity are proved 用本文的方法，在重构误差将近千分之一的情况下，取得了较好的滤波器特性，其阻带衰减达到- 75db ，文中给出了matlab实验程序及结果，并通过simulink仿真，证明了这种方法的正确性与有效性。
This method can not only minimize the stopband energy of the prototype filter , but also determines the inter symbol interference power and the transition band energy , which can be used to design prototype filters for both the critically sampled fmt system and the non - critically sampled fmt system 该方法不仅可以最小化原型滤波器的阻带能量，还界定了符号干扰功率、过渡带能量，适用于严格采样和非严格采样滤波多音调制系统。
This dissertation is a part of the research project , " millimeter wave synthetic aperture radar ( sar ) " , which is the pre - researchful item of the elelctric 10th institute of ministry of information industry . it ' s aim is to improve performance of stop - band of waveguide band - pass filter ( bpf ) 本论文工作是中国电子科技集团公司第十研究所“十五”预研项目“毫米波合成孔径雷达”中的一部分。要求对目前的e面全金属膜片波导滤波器进行改进，提高其阻带性能。
The main work of the system can be divided into four main parts as the following : ( 1 ) 10 . 5ghz bandpass filter the main contradiction of filter is caused by its function of dividing frequencies . in order to properly divide frequencies , not only need passband ’ s attenuation to be as small as possible and stopbands ’ as big as possible , but also need a sharp and quick change between the attenuation of passband and stopband , thus to make their diversity obvious 这四个功能模块分别是: (一) 10 . 5ghz带通滤波器滤波器的主要矛盾是由它分隔频率的功能决定的,为了使分隔理想,一方面要求通带的衰减尽可能小,阻带衰减尽可能大,亦即通带和阻带的衰减差值要尽量大;另一方面要求通带和阻带之间衰减的变化应尽可能快,最好是陡峭的跳变,使阻带和通带的分隔十分明显。
