查询词典 antenna switch

First, based on phased array antenna's mono-pulse goniometry and separate coordinate technology about phase control, the antenna beam pointing error formula, caused by phase quantization error, is derived from linear array and circular array to planar array and cylindrical array.

首先以单脉冲相控阵天线测角原理为基本理论出发点，利用相位控制的坐标分离技术，基于线阵、圆形阵等简单形式的相控阵天线，推导了平面阵、圆柱面阵等相控阵天线由相位量化误差引起的波束指向误差公式。

Features: Near-field RFID operation to enable reading of Item Level Tags Work with UHF Gen2 RFID tags that incorporate an inductive near-field component including the Button, Paperclip and Satellite tags High performance, low cost antenna solution Table top or table bottom mounting Specifications: Information in this specification is subject to change without further notice The CS-777 near-field reader antenna is a key enabling technology for UHF Gen2 Item-Level Tagging systems.

它可用于零售和制药应用，图书馆系统，文件控制，检查柜台和许多其他应用程序需要一个短距离和密集读取范围的限制的关建技术应用。近场的RFID运作，使项目级标记阅读超高频二代RFID标签的工作融合了归纳近场组成，其中包括高性能，低成本的天线解决方案表顶部或底部安装表规格：使技术UHF第二代产品级别标记系统。

A series of theoretical and experimental studies on the microstrip patch antennas with dielectric superstrates is carried out systematically. Firstly, a comprehensive survey of the microstrip antenna technology and its theories are presented. Then, two analysis techniques, named as the spectral domain Green's function method and the spectral domain integral equation method are developed. The SDGF method is a simplified analysis technique, which takes advantage of the spectral domain immittance approach to find the dyadic Green's function for the stratified media, and obtains the complete closed-form formulas for radiation patterns, directivity, efficiency, gain etc. Some interesting calculated results are presented. The SDIE method is capable of determining resonant frequency, radiation characteristics, input impedance etc, for the covered microstrip patch antennas. Comparing with other full-wave analyses it reduced computation and mathematical labour remarkably. The singularities near the pole location of the surface-wave modes and the difficulty of the integral computation over infinite range of oscillating integrands are dealt with actively and documented well. Results predicted by the SDIE method agree extremely well with our experimental results for resonant frequencies of various superstrates. The superstrate effects on impedance and radiation characteristics also have been investigated experimentally so that the gap due to lack of measured data and computed results for multi-layered superstrate has been filled to some degrees and two useful observations have been achieved for weakening the resonant frequency shift and optimizing the microstrip antenna gain. As a meaningful application, the design and analysis of a 4×4 patch array are introduced.

实用微带天线普遍加介质覆盖层来防护热，物理损伤和环境影响，也可能在飞行或严酷气候条件下自然形成覆盖层本论文对带介质覆盖层的微带贴片天线系统地作了一系列理论和实验研究首先，对微带天线技术和理论作了全面的综述然后，发展了两种分析方法，称为谱域格林函数法和谱域积分方程法SDGF法是一种简化的分析技术，它利用谱域导抗法来求得分层媒质的并矢格林函数，并得出方向图、方向性系数、增益等参数的完整的闭式公式，给出了一些令人感兴趣的计算结果SDIE法能确定介质覆盖微带天线的谐振频率、辐射特性和输入阻抗等与其它全波分析方法相比，它明显减小了计算量和数学工作量已有效地处理了表面波模极点附近的奇异性和对振荡的被积函数的无限区间积分计算的困难对于不同覆盖层情况下的谐振频率，由SDIE法所预示的结果与我们的实验结果吻合得很好对于覆盖层对阻抗和辐射特性的影响也已作了实验研究这在某种程度上填补了缺少实验数据和计算结果之间的间隙，并得出了缓解谐振频率偏移和优化天线增益的两点有用的结论作为有意义的应用，介绍了一个4×4元矩形贴片天线阵的设计和分析。

The possibility of works with the integrated antenna both to the method and to the transfer, in the opinion of producer, it makes possible to forego the wire head sets (wire which usually is used inthe role of antenna).

的可能性，工程与集成天线既要方法和技术转让，在民意的生产者，它使得有可能放弃钢丝头部套（钢丝通常是使用中的作用天线）。

In this thesis, we studies four key problem of 3G base station array antenna for mobile communication, designed radiation units, array synthesis, feeding network and antenna measurements.

本论文主要研究了基站天线的四个主要的问题：设计阵列的辐射单元、阵列的综合、馈电网络的实现和基站天线的测量。

Results reveal that the spatial correlation properties of MIMO channel are dependent on the PAS, the antenna pattern and the geometric configuration of the array. When the PASs at the base station and the mobile station are independent, the spatial correlation matrix of the MIMO channel is the Kronecker product of the spatial correlation matrix at the BS and the MS. The temporal correlation properties of the MIMO channel are determined by the PAS at the MS, antenna pattern and the traveling speed of the MS. Based on the analysis of the physical essence, the temporal correlation properties are equivalent to the spatial correlation properties at the MS. The joint spatio-temporal correlation properties at the BS and the MS are quite different. When the PASs at the BS and the MS are independent, the spatial correlation at the BS is independent on the temporal correlation, but this is not true for the spatial correlation at the MS.

分析与计算的结果表明，MIMO信道的空间相关特性由角度谱、阵元的方向图、阵元间距以及阵列几何结构决定，并且当发射端与接收端的空间统计特性相互独立时，MIMO信道的空间相关矩阵可以表示为发射阵列空间相关矩阵与接收阵列空间相关矩阵的Kronecker乘积：信道的时间相关仅与MS端的角度谱、阵元方向图以及MS的运动速度有关，通过对信道时间相关的物理本质的研究，说明了时间相关与MS端空间相关的等价性；MIMO信道的空-时联合相关特性在BS端和MS端具有不同的特点，当发射端与接收端的空间统计特性相互独立时，BS端的空间相关与时间相关是独立的，而由于信道的时间相关与MS端的空间相关具有相同的物理本质，MS端的空间相关与时间相关不是独立的。

The combination of Generalized Likelihood Ratio Test and Antenna Selection is applied to Unitarysignal transmission system, and antenna selection and signal detection do not require Channel State Information.

摘要该文提出了多天线传输系统的非相干天线选择算法，将广义似然比检验与天线选择结合应用于U码传输系统，天线选择和信号检测无需信道状态信息。

The "NVIS"(Near-Vertical Incidence Sky wave) antenna is set on the horizon, which can clear up the dead zone of short-wave communication, and a ferrite loading spiral coil antenna is installed on the rocker projectile to receive the short wave signal.

在地面设置近垂直入射天波传播"NVIS"天线，消除短波通信静区，弹上安装铁氧体加载螺旋线圈天线接收短波信号，利用原有弹载计算机进行数据处理。

So the circular disc monopole antenna is optimum designed and a novel Klopfenstein taper monopole antenna is proposed.

为此本文对圆片单极天线进行了优化设计，提出一种新型的Klopfenstein渐变单极天线。

Now our main products are: PTX-LCD, TEX-LCD/S, BLUES30NV serial FM exciters, TX serial 1-10KW FM transmitters, TX serial 3-20KW hot plug-in transmitters, AJ1F serial vertical polarization FM antenna, DPA serial panel FM antenna, star-point or bridge style FM multiplexor, digital STL microwave link, professional receivers and any TV related products.

公司主要产品有：PTX-LCD/S，TEX-LCD/S，BLUES系列调频激励器，TX系列1-10KW调频发射机，TX系列3-20KW热插拔数字调频发射机，AJ1F系列各种功率等级的垂直极化调频天线，DPA系列带反射板偶极子调频天线，星型，桥型系列大功率调频多工器，数字STL微波传输系统，专业调频收转机等及所有电视设备产品

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48