查询词典 antenna switch

The present invention provides an antenna coupling preventing system and method capable of minimizing coupling between a GPS antenna and a CDMA antenna.

公开一种移动通信终端的天线耦合防止设备及其方法，该设备具有GPS天线和CDMA天线，根据工作模式，接收GPS信号和CDMA信号。

Finally, the four-unit cylindrically conformal microstrip antenna array is processed and tested. Testing results indicate that, the input VSWR of the antenna array in the vicinity of 1.575GHz is less than 2, the omni-directional performance good, 3dB bandwidth is about 90 degree on axial plane, right-hand circularly polarization good. Overall performance of the antenna array satisfies the design requirements.

对仿真获得的四单元柱面共形微带天线阵列进行了加工测试，测试结果表明该天线阵列在1.575GHz附近工作频带内输入驻波小于2，柱面法向平面全向性良好，轴向平面3dB波瓣宽度约为90。，右旋圆极化效果良好，天线整体性能达到工程设计要求。

At first, four analysis approaches of microstrip antenna are involved, then radiation principle of rectangular microstrip patch antenna by transmission line model theory which brings the design formula of rectangular microstrip patch antenna.

本文首先介绍了微带天线的四种分析方法，其中重点阐述了利用传输线法分析矩形微带贴片天线的辐射原理特性，由此给出了设计矩形微带贴片天线的设计公式。

Wire gauze ; mesh-reflector antenna ; weaving structure ; deployable antenna ; space-borne antenna

金属丝网布；网状天线；编织结构；可展开天线；星载天线

At 915MHz band, Yagi antenna, helical antenna, microstrip antenna array are designed, and the results of simulation and measurement are presented.

设计了工作在915MHz频段八木天线、螺旋天线、微带阵天线，并给出了仿真与测试结果。

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。

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