查询词典 impedance

Put forward using axial symmetry model to calculate zero-sequence impedance of power transformer. The results comparing with the testing value are correct.

提出使用准三维轴对称物理模型计算变压器的零序阻抗，并用实际模型和实验数据验证了计算结果，其结果是合理的。

METHODS: Electrical nerve stimulation and impedance measurementswere performed for the median nerve in the axilla and at theelbow in 29 volunteers.

我们在29名志愿者身上测定了对腋窝和肘部正中神经对电神经刺激反应的强度和电阻。

It must be remembered that a bridge is basically a comparison method of measurement,where impedance ratios balance the bridge.

必须牢记电桥的基本原理是比较测量法，即交流电桥是阻抗比率平衡电桥。

Key word : Power amplifier, impedance matching, broad band amplifier, smith chart, radio frequency

结果表明，设计出的射频功率放大器符合设计参数要求，具有良好的性能。

Tunable passband property of the stepped-impedance resonator is used for the design of dual-band bandpass filter that can be applied to wireless local area network communication system. Design theory for this type of filter is presented.

利用阶梯阻抗谐振器的通带可调的特性，设计了可用于无线局域网通信系统的双通带滤波器，给出了设计理论。

Simulations based on finite integration method are carried out in a wide frequency range for a balanced feeding finite wide-angle biconical antenna and many results including input impedance and far fields are obtained.

利用基于有限积分法的电磁场仿真技术对平衡馈电的有限长宽角双锥天线作了计算，得到了天线在很宽频带内输入阻抗、远区辐射场与频率的关系曲线。

Finite wide-angle biconical antenna ; modal analysis ; finite integration ; input impedance

有限长宽角双锥天线；模式匹配；有限积分法；输入阻抗

The antenna has a composite structure of a cage and an asymmetric biconical structure. The impedance bandwidth and radiation pattern bandwidth are enhanced, and the tilting and ripping of radiation patterns are eliminated.

将笼型与不对称双锥结构相结合，展宽了天线的阻抗和方向图带宽，抑制了天线辐射方向图在宽频带内上翘或裂瓣。

By using symmetry and boundary conditions the field and input impedance of finite wide-angle biconical antenna can be derived by modal analysis, which generally results in solving infinite linear equations.

模式匹配法利用有限长双锥天线的轴对称性求解天线电磁场边值问题，通常导致求解无限多个线性方程而得不到严格解。

with the development of satellite navigation communication,antenna is a very important unit,performance of the satellite navigation communication system is affected by it partly.a new type of bifilar helix for satellite navigation communication system is introduced,and the traving-wave bifilar helix is analyzed briefly.meanwhile,the design and the test results are given.the results show that the antenna possesses excellent circular hemispherical beam with wide angle circular polarization and better impedance match,and has a compact structure and high integration.it can be applied in caps systems successful.

小 摘要：随着卫星导航通信技术的迅速发展，天线作为卫星导航通信系统中的重要部分，在一定程度上决定着卫星导航通信系统的性能。介绍一种用于卫星导航通信系统的双臂螺旋天线，讲述爬行波式螺旋天线的设计过程，并给出最终测试结果。结果表明，该天线具有优良的圆对称半球波束，良好的广角圆极化特性和优良的阻抗匹配特性，其结构简单、紧凑，为通信入站回传提供了一种优良的选择。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了