查询词典 dipole antenna

This new kind of smart antenna system has the advantages both of the smart antenna and the switched beam antenna, enlarges the system capacity and is easy to realize.

这种新的智能天线系统结合了两种天线系统的优点，最大限度的扩大了系统容量，而且易于实现。

Besides,muti-frequency of E-shaped antenna and lower back lobe of inverted F antenna are embodied by the antenna.

该天线兼备E形天线的多谐振特性和倒F型天线的低后瓣特性。

A new method based on E-shaped antenna and inverted F antenna is developed in order to meet requirement of 840~845 MHz and 920~925 MHz in China.The novel antenna is designed in this paper.

针对射频识别系统UHF频段的中国标准840~845 MHz和920~925 MHz，提出一种基于E形天线和共面倒F形天线相结合的设计方案，设计了一款新颖的双频微带天线。

They are mainly: the probe-fed square patch antenna with shorting pins,and the probe-fed rectangular patch antenna with a pair of wide slits (E-shaped patch). The analyses were carried out using method of moments software package. It is shown that the probe-fed square patch antenna can be made resonate at three different frequencies of 1.83 GHz,2.16 GHz and 2.74 GHz respect...

同时，采用基于MOM的软件包分析了天线性能，证明方形天线可以工作在3个频率点，即1.83GHz、2.16GHz和2.74GHz，其最大的增益达到9.4dB；E形天线工作在2.13GHz和2.5GHz，当中心频率为2.4GHz时，带宽达到33.33%(反射损耗≤-10dB)，其最大增益为9.25dB。

The printed UWB antenna is comprised of a planar monopole radiator and the ground plane which are connected to a coaxial cable to launch RF signals. This kind of ground and antenna system is essentially an unbalanced design, where electric currents are distributed on both radiator and ground plane, and then leakage to the outer conductor of the feeding cable. The impedance matching and radiation pattern will be influenced in the low band, which are our focus. Finally, some techniques will be proposed to reduce the cable effect on the antenna performance.

进行超宽频天线量测时，吾人会利用同轴缆线连接到网路分析仪，这时的同轴缆线不只是扮演一个传输讯号的工具而已，由於单极天线的不平衡结构，对低频而言，接地回流电流会泄漏到同轴接地的导体外部，造成同轴缆线也是一个辐射体，影响到天线低频时的阻抗匹配与辐射特性，因此本论文将探讨同轴缆线对於天线一些参数的影响，并研究提出解决的办法。

The low material cost as well as the high product stability is two important factors to design the antenna of Bluetooth headset. Base on the HFSS simulation results, the meander line monopole antenna is applied for the frequency band 2402MHz~2480MHz of Bluetooth headset to design its antenna. The characteristics of the different meander line monopole antennas as compared under there different frequency bands.

本篇论文针对蓝芽系统的无线耳机天线，以节省材料成本以及增加产品稳定性为考量因素做为设计天线重点考量因素，依据应用曲折型单极天线模拟结果於蓝芽频段2402MHz~2480MHz之天线设计测试，并与不同曲折样式之天线在不同频宽进行性能比较。

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。

There are few equivalent circuit modeling methods for UWB antennas. This thesis compares the characteristic of some existing modeling methods and presents a general and precise modeling method for UWB antennas. Firstly, establish the narrowband model of the antenna, and compute the difference between input admittances of the antenna and its narrowband model. Secondly, implement rational approximation of the difference to build the macromodel, and convert it into SPICE equivalent circuits. Lastly, combine the narrowband model and the macromodel to form the ultimate equivalent circuit model of the antenna.

本论文针对目前UWB天线等效电路建模方法比较少的现状，结合现有的天线建模方法的一些特点，研究了一种系统通用、模型精度高的新建模方法：首先建立超宽带天线的窄带模型，计算天线及其窄带模型导纳的差值；接着对差值进行有理多项式拟合，得到相应的宏模型，并转化为SPICE等效电路；最后合并窄带模型与宏模型电路，得到天线等效电路模型。

In the thesis, it was shown that the latitude variation of the angular dispersion should mainly depend on square sum of lower degree deduced Gaussian coefficients if the non-axial-dipole component vs. the axial-dipole component is small.

本文证明，如果地磁场非轴向偶极子分量相对轴向偶极子分量为小量，那么VGP角散布的纬度变化主要由低阶约化Gauss系数的平方和决定。

The results show the existence of three major SSTA spatial patterns, which include the basin-scale single gyre pattern with the center in the northern area, the west-eastward antiphase dipole pattern, and the north-southward antiphase dipole pattern.

结果表明，南海南部海域海面温度异常场空间上主要表现为三种典型的分布结构，即以研究区域北部为中心的海盆尺度的单涡结构、东西反相的经向偶极子分布结构和南北反相的纬向偶极子分布结构，这三种分布结构都以2—4年的年际变化周期为主，反映了研究海域海面温度异常与ENSO现象高度相关。

Article 144 The Government of the Hong Kong Special Administrative Region shall maintain the policy previously practised in Hong Kong in respect of subventions for non-governmental organizations in fields such as education, medicine and health, culture, art, recreation, sports, social welfare and social

第一百四十四条香港特别行政区政府保持原在香港实行的对教育、医疗卫生、文化、艺术、康乐、体育、社会福利、社会工作等方面的民间团体机构的资助政策。原在香港各资助机构任职的人员均可根据原有制度继续受聘。

Small wonder, then, that the Chinese spend more in the shop than any other group of foreign visitors do .

这样的小惊喜，使中国顾客比任何国家的人消费得更多。