查询词典 antennas

A cell phone antenna switching circuit includes a plurality of built-in antennas which perform radio transmission/reception.

一种包括多个执行无线电发射/接收的内置天线的蜂窝电话天线转换电路。

The relationship between the screen mesh and the theoretical and practical ink film thickness was analyzed based on the main influencing factors of the ink film thickness by screen printing. A calculation model for the ink thickness was established based on the screen under static and compressive deformation. The relation curve between the screen mesh and the ink film thickness was fitted and the suitable printing craft parameter was chosen to print two kinds of RFID tag antennas. The fluctuation of the antenna resistance was analyzed to demonstrate the reliability of the passive RFID tag antenna manufactured by screen printing technology.

结合丝网印刷墨层厚度的各主要影响因素，分析了理论墨层厚度和实际墨层厚度与网版目数的关系，建立了网版静态及受压变形两种状态下的墨层厚度计算模型，拟合了网版目数和实际墨层厚度之间的关系曲线，并选择合适的丝网印刷工艺参数，印刷制作了两款无源RFID标签天线，通过天线电阻值的波动情况分析，论证了用丝网印刷工艺制作无源RFID标签天线的品质可靠性。

The single mode dipole antenna is designed by the dipole microstrip theory, and two single-band antennas are combined with the two switches, forming a dual-band antenna. The performance of switch and antenna are obtained by HFSS software simulation, respectively.

根据偶极子天线原理，设计了单模微带偶极子天线，使用开关结构将两个单模偶极子天线连接在一起，实现了双模天线的功能。

The system comprises first and second antennas for receiving first and second RF signals of first and second frequencies, respectively; a mobile switch for measuring performance characteristics of the second antenna; and a switch circuit connected between the second antenna and the mobile switch for controlling flow of the first RF signal to the second antenna.

在移动通信终端内，一开关电路，用于根据工作模式控制CDMA天线的输入阻抗，该开关电路被连接在CDMA天线和移动开关之间，以便在GPS工作模式下维持CDMA天线的输入阻抗为高阻抗，来切断GPS信号的流入，以及在CDMA工作模式下维持CDMA天线的输入阻抗为低阻抗以接收CDMA信号。

Previous studies have put emphasis on how to utilize space channels between receiving and emitting antennas. For the first time, a new conception of wide-sense space channels is proposed which combined antenna channels and beam channels.

以往的研究重点放在如何利用收发天线间的多路空间信道，该文首次提出混合天线信道与波束信道的广义空间信道这一新概念。

Furthermore, we also present the comparison of the simulation result under different rate of space-time block codes but the same number of transmit antennas.

此外，还比较了在相同传送天线数目，不同码率的正交矩阵之下的比较图。

Basing on the theory of"Back-door coupling"and"Front-door coupling", the aperture coupling backed with a box and the mutual coupling between antennas have been discussed in this paper.

本文从电磁耦合的两大途径即&后门耦合&和&前门耦合&出发，分别研究了屏蔽腔体的孔缝耦合效应和多天线系统天线互耦问题。

Ohms radiating coaxial cable is mainly used in tunnel.mine,subway,high building and high way where there is no direct or good radio wave as signal transmission and transmitting and receiving antennas duplex functions,The cables is characterized with low attenuation,lowVSWR,high power capacity,good signal coupling and corrosion resistance.

50欧姆漏泄同轴电缆主要用于隧道、矿井、地铁、大型建筑内及高速公路、铁路等场合无线电波不能直接传播或传播不良的特殊环境内，兼有信号传输线的发送、接收天线的双重功能。具有衰减低、驻波比低、功率容量高，信号耦合性能优良，抗腐蚀性好等特点。

Right now, many schools are financially strapped, and the promise of a monthly check in exchange for leasing a bit of space on the property or building for antennas seems very attractive.

现在，许多学校财政困难，并承诺每月检查，以换取租赁有点空间的财产或建设的天线似乎很有吸引力。

In contrast to conventional track-while-scan radars with mechanically scanned antennas, phased array radars have the capability to switch the direction of the radar beam very quickly without inertia.

相控阵雷达作为雷达技术的一个重要发展方向，与传统雷达相比有着许多技术上的优势和广泛的应用前景。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。