超高频

Radio Frequency Identification System BE make use of RF energy to deliver data,belong to a wireless communication technique,is 1 kind not the system of contact type,it constitutes the component contain the application system of the reader,electron label,Antenna,host computer, its induction method depends on passive type Tag with active type Tag distinguish analyse, can be divided into induction coupling and back scattering coupling and induced the coupling is the induction method (as 135 KHzs、13.56 MHzs) which belongs to low frequency、high frequency,the back scattering coupling is the induction method(as 915 MHzs、2.45 GHzs) which belongs to superhigh frequency,microwave, and what we construct apply system is use the high frequency 13.56 MHzs of induction coupling method.

中文摘要无线射频辨识系统(Radio Frequency Identification；RFID)是利用RF能量来传递资料，属於无线通讯技术，是一种非接触式的系统，其组成元件有读卡机、电子标签、天线、主电脑应用系统，其感应方式依被动式Tag和主动式Tag来区分，可分为感应耦合和反向散射耦合而感应耦合是属於低频、高频的感应方式(如135KHz、13.56MHz)，反向散射耦合是属於超高频、微波的感应方式(如915MHz、2.45GHz)，而我们所建构的应用系统是使用高频13.56MHz的感应耦合方式。

The three antennas which receive VHF impulses emitted by a lightning discharge are placed on the vertices of a right-angled isosceles triangle with perpendicular sides 120 meters in length.

三个接收天线(接收闪电放电辐射的超高频脉冲)分别放在一个垂直边长为120米的直角等腰三角形的顶点，由到达天线的时间差来计算接收到的闪电脉冲的方向。

At the end of his career, he mostly worked on various projects for power amplifiers, RF filters and multiplexers, communications systems and VHF and UHF antennas.

在他职业生涯的最后阶段，他主要从事各种放大器，高频滤波器，多路复用器，通信系统和特高频，超高频天线的规划。

Like all JTRS Operational Requirement Document waveforms in the 2 MHz to 2 GHz frequency range, the UHF SATCOM and HF waveforms can run in any of the GMR system's four reprogrammable Universal Transceivers.

同所有联合战术无线电波形需求在2MHz到2GHz之间一样，超高频卫星通信和高频波形能够在任何车载地基移动无线电系统的四重编程通用收发器中运行。

Furthermore, UHF antennas are smaller than VHF antennas; this is due to the shorter wavelengths.

此外，在超高频天线都小于甚高频天线，这是由于较短的波长。

Its typical gain, in the UHF range, is about 33 dB.

它的典型的增益，在超高频范围，是大约33 dB。

They also emit UHF waves of 225 - 400 MHz.

他们也发射225到400赫兹之间的超高频波。

This particular antenna is my one and I've never had the need to go to a UHF antenna.

这特殊天线是我一个并且我从未有需要去超高频天线。

Theoretical analysis about UHF RFID system and reader is described in this thesis, and most of the efforts are distributed on the key technologies of RFID system.

本论文系统地论述了超高频射频识别系统和阅读器的理论分析，研究了射频识别系统中的许多关键技术。

The power to expose most high frequency transmitters, as well as more common VHF and UHF bugs, is now in the palm your hand.

暴露的权力最高频发射器，以及更常见的高频和超高频的错误，是在手掌你的手了。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。