查询词典 antenna resistance

The application of the fractal structure can be practiced solely on the antennas'design or with other methods. A miniaturized Yagi antenna is designed with the combination of fractal structure and ground plane, and size of the antenna is reduced to 61% compared with traditional Yagi antenna.

分形天线改善天线性能的方法和效果本身具有较强的独立性，一般不会对其他指标产生较大的影响，既可以单独使用，也可以与其它方法结合使用。

The present domestic satellite reception antenna controllers are basically designed according to the extreme value following principle. The satellite antenna controllers can aim at the satellite according to the carrier waver signals through driving the antenna to circumvolve repeatedly.

目前国内的卫星接收天线控制器大部分是按极值跟踪原理设计的，这种控制器需根据系统接收到的载波信号大小控制天线反复转动，才能对准卫星。

The hybrid antenna system also includes a displaceable antenna, such as a whip antenna, that is selectively extendable from and retractable with the casing.

该混合天线系统还包括可移动天线，它可以有选择地拉伸出或收缩入外壳中。

For verifying the design scheme of the refractive diffractive incorporate antenna system, an experiment antenna system is accomplished which is used to compare its performance with the Keplerian antenna which has being used in the CO 2 coherent laser system.

引 言随着相干激光雷达的广泛应用，对于其小型化的要求越来越突出，尤其是用于机载，弹载等携带用途的成像激光雷达要求它的系统具有小型，轻便等特点，而考虑远距离相干外差探测的特点时，则要求主振激光器具有高发射功率，光学系统具有高像质，高效率。

A new quadrifilar helix antenna is given. The antenna has four feed ports and the phase difference between two border upon ports is 90 degree. The simulation results indicate that this antenna has a good performance of axial ratio and gain pattern.

为了改善天线的轴比性能，文章提出了一种4臂等幅馈电、相位依次相差90度的天线方案，仿真结果表明，这种天线的增益特性和轴比特性都得到了较大的改善。

Delay distortion caused by log-periodic antenna can be avoided by changing its feed ing method; Reflection can be greatly reduced by resistively loading antennas as cylindrical monopole antenna,conical monopole and TEM horn antenna, resulting in better characteristics in radiating pulse signal.

改变对数周期天线的馈电方式可以避免滞后失真；根据 WU- KING偶极子理论，对圆柱单极子天线、单圆锥天线和 TEM喇叭天线等进行加载可以有效减小反射，改善了天线辐射短脉冲的性能，但同时也导致了辐射效率的降

Sectorization is extensively used in cell communication systems. A scheme combined smart antenna and sectorial antenna is proposed which is an effective method to realize sectorization together with smart antenna.

扇区化是蜂窝系统重要的覆盖方式，基于这种考虑提出了一种TD-SCDMA系统实现扇区化智能天线的方法—扇区化智能天线(SSA-Sectoral SmartAntenna)，该方法有效的解决了TD-SCDMA系统智能天线扇区化问题。

Being aim at the optimization issue of load of antenna near ground, it combines many GA strategies and puts forward strategic meme. And it puts out co-evolution algorithm of load of antenna design. And it emulates the optimization design of load of antenna near ground. Finally, it valuates the co-evolution algorithm's efficiency on the continuum search issues of multi-variable and multi-peak value.

针对近地天线加载优化设计问题，结合多种改进GA策略，提出了策略型拟子，给出天线加载设计的共同进化算法，对有耗半空间对称偶极子天线加载优化设计作了仿真实验，验证了共同进化算法对多变量多峰连续搜索问题上的有效性。

Based on these theories, this paper discusses the method of the design of the low noise amplifier integrated active microstrip patch antenna, which considers the low noise amplifier and the microstrip antenna and takes both mutual matching into account. The size of the active integrated antenna and the circuit configuration of the low noise amplifier are obtained at the specified operation frequency.

根据这些理论，把低噪声放大器和微带天线结合起来，并考虑两者之间的匹配，讨论了一种集成低噪声放大器的有源微带贴片天线的设计，得到了在给定工作频率下的有源集成天线尺寸和低噪声放大器的电路结构。

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。

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