Easy Determination of the Characteristic Impedance of the Coaxial System Consisting of an Inner Regular Polygon Concentric with an Outer Circle (Short Papers)

This paper gives a simple method for the determination of the characteristic impedance of an inner regular polygon concentric with an outer circle. The approach makes use of the method of superposition for plane sheets of charge which were radially disposed in the polygon. The results are in good agreemnt with those obtained by Laura and Luisoni.     

外正N边形内圆同轴线的严格解

本文通过保角变换导出了外正N边形内圆同轴线的阻抗公式,它有两个优点。一般性和精确性。N=2的计算特例表明了这一点。     

Characteristic Impedance of a Rectangular Coaxial Line with Offset Inner Conductor

The singular-integral-equation technique is used to derive the capacitance and, hence, characteristic impedance of a rectangular coaxial line with a zero-thickness inner conductor. The position of the inner conductor is arbitrary, but its orientation is assumed to be parallel to the top and bottom walls of the outer conductor. Simple yet very accurate formulas for the capacitance and characteristic impedance are found in terms of complete elliptic integrals.     

Approximate Determination of the Characteristic Impedance of the Coaxial System Consisting of a Regular Polygon Concentric with a Circle (Letters)

This letter gives an approximate method for the determination of the characteristic impedance of an important family of coaxial systems. The approach makes use of the method of conformal mapping, and it has already been used in other technical applications by the first author and his associates.     

用多极理论分析圆柱—正N边形内导体同轴传输线

本文提出用多极理论准解析计算方法分析圆柱－ 正Ｎ 形内导体同轴传输线,介绍了多极理论的准解析计算规则。实例计算结果表明：用多极理论准解析计算方法分析圆柱－ 正Ｎ 边形内导体同轴传输线,其计算精度是相当高的,多极理论准解析计算方法是一种较好的传输线分析方法,可以很方便地应用于传输线工程问题的设计与计算     

边界元法计算内圆外矩同轴线的特性阻抗

利用边界元法计算了内圆外矩同轴传输线的特性阻抗.这种方法计算量小,适用面广,精度也满足工程需求.计算结果和文献的数据非常接近.文章给出了一些曲线和表格,为合理选择内圆外矩同轴线的尺寸结构提供了参考.     

一种计算具有内圆柱导体矩形线特性阻抗的新方法

本文采用保角变换技术，将内外接多边形柱取代内圆导体，得到的传输线特性阻抗Ｚｃｉｎ，Ｚｃｏｕｔ作为真值Ｚｃ的上，下限（Ｚｃｉｎ．Ｚｃ．Ｚｃｏｕｔ），并研究了其相对偏差情况，从而得到了计算具有内圆导体矩形线特性阻抗的一种新方法，所得结果与文献的数据吻合良好，最大偏差＜０．５％。     

An Accurate Determination of the Characteristic Impedance of the Coaxial System Consisting of a Square Concentric with a Circle (Letters)

Bowman has shown how the rectangular region in the w plane of Fig. 1, bounded by 0ABC, may be mapped conformally into the trapezoidal region in the z plane of Fig. 1, bounded by 0ABC, by means of the successive transformations:     

正方外导体-微带内导体传输线特性阻抗严格解

应用保角变换法,严格推导出正方外导体一单一微带、“十”字微带和耦合微带内导体传输线特性阻抗精确表达式,并给出了不同参数条件下传输线特性阻抗的数值结果。     

皱纹外导体泡沫PE绝缘RF同轴电缆的衰减特性

衰减是射频(RF)同轴电缆最重要的传输特性.外导体皱纹深度及泡沫聚乙烯(PE)的介质损耗角正切tg δ是影响皱纹外导体泡沫PE绝缘同轴电缆衰减的主要因素.浅皱纹结构及净化介质材料是降低该电缆衰减值的有效途径.     

同轴双线型加载传输线特性阻抗的计算

本文应用三次样条边界元法(CSBEM)分析了一类特殊结构的TEM波传输线,得出了一组特性阻抗曲线,利用这类传输线可在同一同轴系统内传输多路信号,亦可制作微波无源器件.     

The Characteristic Impedance of a Family of Rectangular Coaxial Structures with Off-Centered Strip Inner Conductors

A two-parameter family of hyperelliptic integrals is exhibited which maps the upper half-phase into the interior of a rectangle pierced by a reentrant line. Since these integrals can be expressed as the sum of elliptic integrals of the first kind, the odd- and even-mode characteristic impedances of a two-parameter family of coaxial structures whose inner conductors are strips, displaced perpendicularly to their width from the center of the outer rectangular conductor, can be expressed in terms of these well-known functions. Numerical values are given for a range of values of W/B and B/sub 1/ /B. Here W is the width of the strip, B is the height of the outer rectangular conductor, and B/sub 1/ is the distance from the strip to the farthest parallel wall of the outer conductor.     

导体阻抗的频率特性

以圆横截面导线、矩形横截面扁平导体条为对象,详细综述了导体阻抗的频率特性,及导体直流电阻与交流电阻的关系,介绍了导体条横截面的几何形状对其电感量大小的影响,指出了搭接条尺寸的选择原则.     

The Characteristic Impedance of a Slotted Coaxial Line

The propagation of a second type of TEM mode in a slotted coaxial line is analyzed. The characteristic impedance of the slotted line is evaluated by means of variational expressions giving upper and lower bounds to the true value. A two term approximation to the charge distribution and a one term approximation to potential distribution give results accurate to within +-2 per cent. Curves of characteristic impedance against angular slot width are presented.     

A Comparison of the Attenuation of High-Order Mode in Coaxial Waveguide due to Inner and Outer Conductor Losses

In this paper, comparison studies of mode attenuation in coaxial waveguides due to inner and outer conductor losses are carried out analytically. Numerical results for some typical high-order modes are presented. This study is helpful for guiding the loading of distributed losses in coaxial gyrotron traveling wave amplifiers.     

SFT型半硬同轴电缆中内导体的选用

SFT型半硬同轴电缆要求其内导体具有较高的强度和较低的导体损耗。从材料、物理状态、尺寸等方面详细阐述了内导体的选择过程。指出了尺寸一致性较好的银层厚度为3um的30％IACS软态镀银铜包钢线作为SFT型半硬同轴电缆的内导体较为合适。     

A Universal Approximate Formula for Characteristic Impedance of Strip Transmission Lines with Rectangular Inner Conductors

An explicit expression is developed for the characteristic impedance of a microwave strip transmission line with rectangular inner conductor of arbitrary dimensions. The expression is exact for zero thickness and arbitrary width, exact for zero width and arbitrary thickness, and quite accurate (within 3% for the extreme cases of a square inner conductor of dimensions about 0.01 of plate separation, but in most cases of practical interest within 0.1%) throughout the entire range of thickness and width.     

The Characteristic Impedance of Rectangular Coaxial Line with Ratio 2:1 of Outer-to-Inner Conductor Side Length (Letters)

Recently, Riblet has given the exact dimensions of a family of rectangular coaxial lines with given impedance by conformal mapping. Before then the same problem was treated in [3], [4]. However, the previous literature does not include the case when the side of the outer and inner rectangle are in the ratio 2:1 both in width and in height: if in [1, eq. (11)] we put OA = DE or EO = AB, modulus k coincides with modulus h and the rectangular line becomes a square coaxial section, which is a special case of Bowman.     

An Application of Conformal Mapping to the Determination of the Characteristic Impedance of a Class of Coaxial Systems (Letters)

Numerical results for the characteristic impedance of the coaxial system consisting of a regular polygon concentric with a circle are presented. In the case of a square concentric with a circle the results are in excellent agreement with those obtained by Riblet.     

A Numerical Calculation of the Capacitance for the Rectangular Coaxial Line with Offset Inner Conductor Having an Anisotropic Dielectric

The capacitances of the rectangular coaxial lines with an offset zero-thickness inner conductor having a sapphire dielectric are presented by using an expanded charge simulation method, In order to apply the method to an anisotropic region, we propose an electric potential formula for a two-dimensional system consisting of a line charge and an infinite plate conductor which are arbitrarily situated in the region. The potential formula is anatyticafly derived by means of an affine transformation, a confomal mapping technique, and the method of images. The capacitance calculated using this method is in good agreement with those of other available methods.