Due to the finite machine precision the contribution from the vector potential will be lost during the numerical process when ω→ 0 . This makes the impedance matrix nearly singular and difficult to invert .

由于有限的机器精度，当ω→0时， 矢量磁位的贡献会丢失，这使得 阻抗矩阵接近奇异且很难求解。

At very low frequencies the contribution from the vector potential to the impedance matrix is much smaller than the contribution from the scalar potential .

当频率很低时， 阻抗矩阵中 矢量 磁位的贡献比标量电位的贡献小得多。

For the convenience of the time-domain convolution the vector fitting method is adopted to expand the time-domain form of the ground return impedance into the sum of finite exponential functions which are easy to be treated and tested to be valid .

为了便于时域卷积，采用 矢量匹配法并结合拉普拉斯反变换将该土壤 阻抗的时域形式展开为有限项指数函数之和，并验证了方法的正确性。

In the process of measuring absorber radio-frequency performance with vector network analyzer the impedance of Vertical Low-frequency Coaxial Reflectometer is mismatched with measurement instrumentation and causes unwanted reflection .

使用 矢量网络分析仪对射频吸波材料低频段吸波性能进行测试的过程中，由于同轴反射计与测试仪器 阻抗失配，将引起不希望有的反射。

Based on the studies of characteristics of orthogonal projection for test voltage vector in branch space which consists of branch transfer impedance the method of locating fault branch by only one test is advanced in this paper .

在研究了测试点电压 增量 向量在由支路转移 阻抗 矩阵组成的空间的正交投影的特性后，提出了仅一次测试的结果就可定位故障支路的方法。

The vector method first determines the principal vector in terms of incident wavefront displacement and the relative magnitude of acoustic impedance at both sides of a reflector then resolves the principal vector to obtain the first motion directions of reflected and transmitted waves .

矢量法是按入射波波前位移，考虑波 阻抗的相对大小定出主 矢量，然后在反射和透射方向上进行分解，从而得到相应波的初动方向。

Shortwave antenna tuning coupler is an important part of shortwave communication systems . This paper introduces a tuning algorithm of shortwave antenna tuning coupler based on vector impedance measuring module . With this algorithm some improvement has been made for the performance of shortwave antenna tuning coupler .

短波天线调谐器是短波通信系统的重要组成部分，现介绍一种基于 矢量 阻抗测量模块的短波天线调谐器的调谐算法，可以改善短波天线调谐器的性能。

Tuning algorithm of shortwave antenna tuning coupler based on vector impedance measuring module

基于 矢量 阻抗测量模块的短波天线调谐算法

In this paper we introduced that the magnetic vector potential was used for computing the magnetic fields due to current distribution of a circular loop antenna and derived the relations between impedance and wavelength .

各向异性磁 矢势A的微分方程及其解本文简述了从环形天线的磁 矢势，求出电流产生的场，并着重导出了 阻抗与波长的关系。

According to this theory the sampling sensitivity of plethysmographic signal is a function of position vector hence the location of current-voltage electrode pairs has great effect on the measurement of impedance plethysmographic signal .

根据这个理论，容积图信号的采样灵敏度是位置 矢量的函数，因而电流一电压电极对的位置对 阻抗容积图信号的测量有很大的影响。

Using the vector plane analysis and impedance plane analysis this paper presents a fault-component based distance relay construction method which uses the pre-fault compensated voltage as datum component .

以相 量平面法与 阻抗平面法为分析手段，提出一种以故障前补偿电压为基准量的故障分量距离继电器构成方法。

For the convenience of time-domain convolution the vector fitting method is adopted to approach the characteristic impedance and delay function in complex frequency-domain .

为了便于时域卷积，对不同模量上的特征 阻抗和延时函数在复频域采用 矢量匹配法进行拟合。

Vector impedance locus plotter

向量 阻抗轨迹绘图仪

In the process of measuring radio frequency absorb material by vector network analyzer the impedance of rectanglecoaxial measuring device is mismatched and cause redundant reflection .

在使用 矢量网络分析仪对射频吸波材料进行测试的过程中，由于矩形同轴装置 阻抗不匹配，将引起不希望有的反射。