像差畸变及预校正映射

本文根据磁偏转场畸变的物理原因，分析构造畸变及校正的映射函授，并给出校正电路的运算公式及公式的精度分析。     

测量公式的新概念

本文探讨测量学的最基础的学问：怎样表达测量公式。提出区分测得值法则,提出有别于物理公式的新的测量公式概念,给出建立测得值函数的方法,理顺误差分析的程序。给出新的计时公式。     

雷达目标高度公式推导及适用性研究

本文首先详细推导了“雷达原理”中远距离目标测高公式,该公式相当于目标测高精确公式经泰勒展开后一阶近似结果;接着又给出了测高公式相对误差,根据相对误差的容忍程度分析了公式的适用性问题,给出了容忍误差为1％和0.1％时的适用范围.本文的研究不仅有利于雷达课程教学,同时对雷达工程实践也有参考价值.     

电子在双垒二极管中的共振隧穿

本文对双垒二极管中的电子隧穿作了数值分析。引入隧穿矩阵，建立了透射系数的公式；利用该公式，计算了隧道电流。此外，本文还分析了势垒结构对伏－安特性的影响。     

浅谈量本利分析在电视台的应用

本文利用量本利分析对电视台的成本进行了成本性态分析，建立了电视台量本利基本公式，利用基本公式及其变形公式对电视台费用、利润进行测算，对电视台相关因素进行敏感分析，认为量本利分析在电视台解决广告定价、销售量预测、成本费用控制、企业经营安全以及制定应对市场变化的策略等方面将大有作为。     

窄带滤光片研究——带宽探讨

本文采用导纳矩阵法,并作了适当近似处理,导出了全介质法布里——珀罗滤光片半带宽公式的普遍形式,并与常用的半带宽公式作了计算精度比较,分析了影响半带宽的诸因子。最后对普遍公式作了分析讨论。     

关于三点 五点 七点微分公式应用的一点分析

本文首先简要地分析了三点、五点和七点微分公式的误差,然后指出应用该公式时需要注意的问题。     

波导缝隙外部半空间场矩阵元素的计算方法

本文证明了用Galerkin法对波导缝隙特性分析时,Fourier变换法导出的缝隙外部半空间场的矩阵元素公式与一般积分法导出的公式是等同的.同时把这两种方法中含有二重积分的公式简化为一重积分形式.并描述了利用简化公式的优点.     

矩形截面互连线电阻计算公式

本文提出两个矩形截面互连线单位长度电阻随频率变化的计算公式。利用数值方法计算得到频率变化时矩形截面互连线单位长度的电阻值,根据数值计算结果,使用麦夸特方法首先得到计算矩形截面单根导线电阻的简单公式,该公式可广泛用于分析片上电源网格IR-drop问题。与其它公式相比,该公式在宽频率、大宽长比范围内均有较高精度。另外,本文还得到类似微带的互连线（互连线加上地线）电阻计算公式,该结构是分析片上或封装系统功率传输问题的典型结构。     

辐射测温仪的误差分析及设计考虑(二)

本文导出计算亮度温度计及比色温度计可能达到的最小可鉴别温差的公式、与此对应的带宽公式及灵敏度公式,并根据这些公式讨论设计辐射测温仪时应如何选取波长及带宽的问题。对比色法最佳工作波长的选取进行了讨论,并对典型样机的数据进行了分析比较。     

Analysis of Microstrip-Like Transmission Lines by Nonuniform Discretization of Integral Equations

The nonuniform discretization of the integral equation on the tangential electromagnetic (EM) field on the boundary surface is proposed as a numerically efficient method to analyze the microstrip-like transmission lines. The calculated results of the propagation constant of the microstrip line based on this method are compared with other published analytical results. Various types of planar striplines are treated by the same formulas. The dominant and higher order modes of shielded microstrip line are discussed and compared with the longitudinal-section electric (LSE) and linear synchronous motor (LSM) modes of a two-medium waveguide.     

Problems in Strip Transmission Lines

A review is given of characteristic-impedance formulas for shielded-strip transmission lines. From these formulas a set of approximate relationships for the attenuation and Q of a dielectric-filled shielded-strip transmission line is derived. The method makes the standard assumption that the current distribution is that of a lossless line and the surface resistivity that of an infinite-plane condutor. Although this method applies accurately to most other types of lines, in this case an error of the order of 10% is believed to occur due to the failure of the assumptions at the corners of the strip. However, the error is in a direction that makes the computed values conservative, and the accuracy should be sufficient for most practical purposes. The derivation of a correction term is now being attempted. In addition to the discussion of attenuation attention is given in this paper to the design considerations involved in a shielded-strip-line impedance meter, and to some preliminary data obtained with this device. Also the future topics for investigation under this research and development program are mentioned.     

Accurate Wide-Range Design Equations for the Frequency-Dependent Characteristic of Parallel Coupled Microstrip Lines

In this paper, closed-form expressions are presented which model the frequency-dependent even- and odd-mode characteristics of parallel coupled microstrip lines with hitherto unattained accuracy and range of validity. They include the effective dielectric constants, the characteristic impedances using the power-current formulation, as well as the open-end equivalent lengths for the two fundamental modes on coupled microstrip. The formulas are accurate into the millimeter-wave region. They are based on an extensive set of accurate numerical data which were generated by a rigorous spectral-domain hybrid-mode approach and are believed to represent a substantial improvement compared to the state-of-the-art and with respect to the computer-aided design of coupled microstrip filters, directional couplers, and related components.     

圆柱型微带线的准静态特性

本文以平面微带线为中介使用保角变换法研究了非平面圆柱型微带线的准静态特性。文中给出了特性分析公式，并确定了用二分法进行尺寸综合要求的操作区间和目标函数。最后，进行了数值结果比较，效果良好。     

Application of Modal Analysis to the Transient Response of Multiconductor Transmission Lines with Branches

An effective method for computing the time-domain response of lossless multiconductor transmission lines with branches in cross-sectionally inhomogeneous dielectric media is presented. Lines of this type are characterized by multiple propagation modes having different velocities. The theory of wave propagation on lossless multiconductor transmission lines with inhomogeneous dielectrics is used to obtain the modal amplitudes on the uniform sections of the line. The scattering matrix for the junction is used to compute the transmitted and reflected waves in the different branches at the junction. Each mode arriving at the junction excites multiple modes in all branches. The method described in this paper identifies all propagation modes in all branches of the line, and leads to the direct physical interpretation of the results. The method is general and can be applied to either partially or completely nondegenerate cases. Experimental results for a six-conductor transmission line with a single branch are found to be in good agreement with the results computed using the described method.     

直线法分析超导微带传输线

本文首次应用直线法结合二流体模型对超导微带传输线进行了分析。针对多层介质结构和普通结构，分别计算了衰减特性、色散特性以及特性阻抗。结果表明超导微带线比普通导体微带线具有更好的性能，如低损耗、低色散和较小的电路尺寸。与已发表的文献相比较验证了本文方法的可行性。     

主扰回路对失配被扰回路的耦合效应

利用积分方法分析了主扰回路对失配被扰回路的耦合效应,得到了计算被扰回路耦合电压的一般公式,将积分方法的使用范围拓展到了高频范围,并用经典的耦合干扰分析方法进行了验证,得出Klewe理论和Jarvis模型得到的结果是此一般公式的特例.该公式在低频和高频条件下均适用,并能将传输线的反射,损耗,相移和平行长度不相等都考虑在内.     

Wave Propagation and Attenuation in the General Class of Circular Hollow Waveguides with Uniform Curvature

A general method has been developed to evaluate the propagation constant in oversized circular hollow-core waveguides characterized by a surface impedance and admittance due to a uniform bend. Completely different formulas are obtained for the attenuation constants of the modes in metallic or dielectric hollow waveguides from those obtained by Marcatili and Schmeltzer. Electric-field lines are also presented for several lower order modes in bent waveguides.     

Low-loss Transmission Lines for High-power Terahertz Radiation

Applications of high-power Terahertz (THz) sources require low-loss transmission lines to minimize loss, prevent overheating and preserve the purity of the transmission mode. Concepts for THz transmission lines are reviewed with special emphasis on overmoded, metallic, corrugated transmission lines. Using the fundamental HE₁₁ mode, these transmission lines have been successfully implemented with very low-loss at high average power levels on plasma heating experiments and THz dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) experiments. Loss in these lines occurs directly, due to ohmic loss in the fundamental mode, and indirectly, due to mode conversion into high order modes whose ohmic loss increases as the square of the mode index. An analytic expression is derived for ohmic loss in the modes of a corrugated, metallic waveguide, including loss on both the waveguide inner surfaces and grooves. Simulations of loss with the numerical code HFSS are in good agreement with the analytic expression. Experimental tests were conducted to determine the loss of the HE₁₁ mode in a 19 mm diameter, helically-tapped, three meter long brass waveguide with a design frequency of 330 GHz. The measured loss at 250 GHz was 0.029 ± 0.009 dB/m using a vector network analyzer approach and 0.047 ± 0.01 dB/m using a radiometer. The experimental results are in reasonable agreement with theory. These values of loss, amounting to about 1% or less per meter, are acceptable for the DNP NMR application. Loss in a practical transmission line may be much higher than the loss calculated for the HE₁₁ mode due to mode conversion to higher order modes caused by waveguide imperfections or miter bends.     

Unified Approach to Solve a Class of Strip and Microstrip-Like Transmission Lines

This paper presents a unified analytical approach to solve a class of shielded strip and shielded microstrip-like transmission lines with multilayer dielectrics under TEM-wave approximation. The analysis makes use of the variational technique in the space domain combined with the "transverse transmission line" method. Expressions are derived for the capacitance of a single line, coupled two-line and coupled four-line structures. The same formulas can be used for a class of such structures by the substitution of a single parameter, namely, the admittance at the charge plane, which can be obtained using the standard transmission line formulas. Numerical results of two special structures, namely, the broadside-coupled suspended microstrip lines, and broadside-coupled inverted microstrip lines, using two suspended, dielectric substrates are included. The technique presented is the simplest compared to any other analytical procedures reported in the literature.