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1.
该文首先提出了含源-负载交叉耦合滤波器的等效网络模型,并给出了这种结构的传输函数t(s)以及矩阵的综合方法。由含源-负载交叉耦合二端口网络的短路导纳矩阵推导了耦合矩阵M中MSL、MSi和MiL的一般表达式。最后,设计了一种新颖结构的含源-负载交叉耦合的微带滤波器,对其进行了仿真与制作,实测结果与仿真值、理论值吻合较好。  相似文献   

2.
一些电路教材对二端口网络的连接方式进行了介绍并给出复合二端口参数矩阵的计算方法。多个二端口的任意连接可以构成复合多端口网络,其参数矩阵也可以由构成它的二端口网络的参数矩阵表示。本文类比了电路网络中的关联矩阵,建立描述二端口和复合多端口关系的端口关联矩阵,并利用二端口的特性和串并联的特点,给出了求解复合多端口网络参数矩阵的新方法。  相似文献   

3.
计算网络多端口多参数高阶灵敏度的简便方法   总被引:1,自引:0,他引:1  
孙湛惠  黄香馥 《电子学报》1990,18(2):97-103
本文首次给出了函数矩阵Hadamard乘积的微分性质,在文献[1]的基础上,推得了网络多端口多参数二阶灵敏度的矩阵表达式。该文指出计算网络多端口多参数二阶灵敏度的简便方法,是通过一个所谓“基础子阵”的Hadamard乘积的简单运算来实现的,这个基本思想同样适用于更高阶情况。  相似文献   

4.
本文提出了一种处理多端口耦合问题的有效方法。在该问题中,各端口波导分别通过一耦合孔与耦合区进行耦合。利用矩量法,首先导出了多端口耦合问题的关于传输模和截止模的等效导纳矩阵的计算公式。在此基础上,考虑到截止模加载于端口波导的特性阻抗,经过适当的矩阵运算,得到仅仅关于传输模的等效导纳矩阵。用此方法计算了一个 H 面 T 形接头的等效导纳矩阵和等效电路参数,所得结果与文献[1]们的结果非要吻合。  相似文献   

5.
刘彬 《电子学报》1992,20(11):82-87
本文论述了双端接阻容负载RC二端口网络转移电压函数的极点与RC阻抗和导纳乘积的零,极点位置分布关系定理.导出了双端接载与等效单端接载网络转移电压函数之间关系的数学模型,利用一次归并和两次分解途径给出了双端接任意阻容负载网络的实现方法.  相似文献   

6.
含源-负载交叉耦合的准椭圆函数滤波器设计   总被引:1,自引:1,他引:0  
该文首先提出了含源-负载交叉耦合滤波器的等效网络模型,并给出了这种结构的传输函数以及矩阵的综合方法.由含源-负载交叉耦合二端口网络的短路导纳矩阵推导了耦合矩阵中、和的一般表达式.最后,设计了一种新颖结构的含源-负载交叉耦合的微带滤波器,对其进行了仿真与制作,实测结果与仿真值、理论值吻合较好.  相似文献   

7.
根据微波六端口结的电路拓扑结构,分别用多端口网络的散射矩阵与导纳矩阵之间的关系和特征模法求出其散射矩阵,由两矩阵相等可求出微波六端口结电路的各个参数.利用该方法设计了中心频率为f=2.4GHz的微波六端口结,仿真结果表明,相对带宽为26%,符合宽带设计目标.该方法简单、高效,而且可以通过控制计算精度(│△S<,11>│)来实现宽频设计,适合推广到其它多端口网络的设计.  相似文献   

8.
1.5GHz七端口网络制作在10×17cm~2氧化铝衬底上,它由四个3dB定向耦合器和一个同相/反相接头组成.给出该网络确定反射系数的几何解释.文中用G·Engen法确定七端口网络中定标的初始常数,考虑到器件性能不完善,并导出初始常数的修正公式。  相似文献   

9.
一种多端口器件测量技术   总被引:1,自引:0,他引:1  
给出了一种用二端口矢量网络分析仪(VNA)对多端口器件进行测量的方法,该方法运用简单的迭代法,减小由于其余端口所接负载的非匹配性引入的误差,易于通过软件实现。利用该方法对三端口器件巴伦进行测量,并将最后结果与三端口VNA测得的结果进行比较。比较结果表明,幅度误差小于0.2dB,相位误差小于3°。该方法在多端口VNA不可获得的情况下,可以应用到多端口器件的精确测量上。  相似文献   

10.
介绍一种新型的适用于耦合谐振器网络的多端口耦合矩阵,它是对过去的双端口网络耦合矩阵的推广。应用多端口网络耦合矩阵可以方便地优化综合多工器,这样得到的多工器由于没有额外的消抗网络,相比过去的设计方案要小型而紧凑得多。通过仿真试验,验证了其有效性,及与理论的一致性。  相似文献   

11.
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.  相似文献   

12.
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's.  相似文献   

13.
The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.  相似文献   

14.
Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.  相似文献   

15.
The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.  相似文献   

16.
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.  相似文献   

17.
It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.  相似文献   

18.
Waveguide multilayer optical card (WMOC) is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling & processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic (VB) language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.  相似文献   

19.
To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.  相似文献   

20.
We have fabricated the white organic light-emitting devices (WOLEDs) based on 4,4' -bis(2,2 -diphenyl vinyl)-1,1' - biphenyl (DPVBi) and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene (rubrene). The device structure is ITO/2T-NATA (20 nm)/NPBX (20 nm)/CBP: x%Ir(ppy)3:0.5% rubrene (8 nm)/NPBX (5 nm)/DPVBi (30 nm)/Alq(30 nm)/LiF(0.5 nm)/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris (2-phenylpyridine) iridium [Ir(ppy)3], acts as a yellow light-emitting layer, and N,N' -bis- (1-naphthyl)- N,N' -diphenyl -1, 1' -biphenyl-4,4' -diamine (NPBX) acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir (PPY)3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.  相似文献   

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