查询词典 antennas

To overcome the drawbacks in the weight and cost of the antenna with the corrugated soft surface, a new patch antenna with patch rings is designed. Its weight is about 1/4 less than the antenna with the corrugated soft surface and it is inexpensive. Good experimental results are obtained. The radiation pattern of the antenna is more rotationally symmetric, and a more reduction on the sidelobe levels of the antenna is achieved as compared to the antenna with the corrugated soft surface. In conclusion, in the present thesis both theoretical and experimental research works have been carried out intensively on patch antennas based on photonic-bandgap structures.

为了克服皱褶软表面天线份量重，加工费用贵等缺点，我们对空气介质的皱褶圆环结构软表面天线进行了改进，将周期分布的皱褶圆环平面化，并保持结构的软表面特性，设计出了一种新的平面圆环结构的软表面天线并进行了实验研究，加工的平面圆环结构天线比皱褶圆环结构天线重量减轻了约1/4，加工费用大大降低，所取得的实验结果显示，该平面圆环结构软表面天线的方向图的轴对称性得到了改善，在俯仰角从0°～-90°的范围内天线H面的波束与E面重合，与皱褶圆环结构相比，天线的旁瓣和背瓣受到了更大的抑制，E面方向图上+120°方向的旁瓣被明显削弱。

A low complexity detection scheme for the MIMO system with distributed transmit antennas is presented. Based on a Sorted CHolesky Decomposition, the additive gaussian color noise after match filter is whitened; The detection sequence according to the post signal noise ratio is reordered, and the risk of error propagation is degraded. The whole algorithm only requires one matrix inverse.

摘要针对发射天线分布的MIMO信号，基于排序的乔列斯基分解过程(Sorted CHolesky Decomposition，SCHD)，将匹配滤波后的加性高斯色噪声转化成加性高斯白噪声，根据后验信噪比对发射信号检测顺序进行重排，降低了误差传播的影响，该算法仅需一次矩阵求逆操作。

One of Dr Dickey's rubber-coated antennas, though, can be tuned by stretching the antenna itself.

Dickey博士的橡胶外壳的天线，可以通过伸展天线本身来调谐。

In this thesis, the radiation principle and the structure of slot antenna are studied and the impacts on its performance of every structure parameter in a slot antenna design are analyzed. On this foundation, a design plan of planar slot array antennas is proposed. The design has some structural feature as follows:(1) with different dielectric layers and microstrip line structure to guide the electromagnetic wave effectively;(2) the feeding network formed of microstrip line can match with the radiating slots expediently;(3) in order to increase the bandwidth of the antenna, the wider slot and branched feeding microstrip line are adopted to form a double resonance.

本文对缝隙辐射的原理、缝隙天线的结构作了探讨，分析了缝隙天线设计中各结构参数对其性能的影响，并在此基础上提出一种平面型缝隙天线的设计方案，它具有以下的特点：(1)采用分层结构，以不同的介电系数和微带线结构形成对电磁波的有效引导；(2)利用微带线构成馈电网络可以方便地与辐射缝隙进行匹配；(3)增大缝隙的宽度，并利用馈电微带线的枝节形成双谐振，以增加天线的带宽。

These must be focused and thus, require antennas which are shaped like the mirror reflector of a focusing flashlight.

必须对这种电子信号聚焦，因此需要能够对闪光灯调焦的、形状像反光镜的天线。

To do so, we are drawing on our experience designing and manufacturing more than 150,000 mobile satellite antennas as well as our groundbreaking low-profile satellite TV antenna technology.

要做到这一点，我们正在利用我们的经验，设计和制造多十五点○○万移动卫星天线以及我们开创性的低姿态卫星电视天线技术。

In this thesis, multimode network technique combined with staircase approximate technique is used to establish a mathematical model to analyze the leaky wave antennas based on NRD guide with arbitrary transverse crosssections.

论文首先利用多模网络方法结合阶梯近似技术构建了适合分析任意截面形状的NRD波导漏波天线特性的数学模型。

Microwave passive components: Isolators, ring, filters, attenuators, couplers, diplexers, antennas, connectors, etc.

微波无源部件：隔离器、环形器、滤波器、衰减器、耦合器、双工器、天线、接插件等

Microwave passive components: Isolators, ring, filters, attenuators, couplers, diplexers, antennas, connectors, etc.

微波有源部件：放大器、混频器、微波开关、振荡器组件等； www。

Microwave passive components: Isolators, ring, filters, attenuators, couplers, diplexers, antennas, connectors, etc.

微波元器件：电阻、电容、电子管、集成电路、高频、负载/终端、微带、波导器件、大功率器件、微波/射频电缆组件、同轴连接器、同轴电缆、毫米波器件、射频器件等

Life. But the intrinsic way of the Internet by wire confines accessing and using of the network information.

然而，Internet固有的有线连接方式大大限制了人们对网络信息的访问和使用。

I have a strong persuasion that this is true .

我坚信这是正确的。