频带

A 4.2–5 GHz, low phase noise LC-VCO with constant bandwidth and small tuning gain

一个4.2至5吉赫兹，低相位噪声，低调谐增益，等子频带间距的电感电容型压控振荡器

The application of imitation for broad band digital seismic recording;2. The article introduces the design of the broad band EMI filter connector,with the em- phasis on the principle and the structure of the filter.

文中介绍了一种用于宽频带低通EMI滤波连接器的设计，重点描述了该滤波器的滤波原理和结构设计，并对滤波插针的有关参数进行了理论计算以及仿真。

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。

A Leaf-like dipole printed on the finite Polytetrafluoroethylene plane with an operating frequency band of 6-8GHz is presented in this paper.

文章摘要：设计印刷在有限大聚四氟乙烯板上的叶状偶极天线，设计的工作频带是6-8 GHz。

In the research, a Low noise, Wide frequency band, High speed Pre-Amplifier was made, and the dynamic range of the lidar was pressed using high speed multiplier and it give the lidar system better specification.

在激光雷达系统的研制过程中，解决了低噪声、宽频带、高速前放的研制，首次使用高速乘法器进行了动态范围压缩，改善了激光雷达系统的性能。

Then, a method to generate adaptive UWB shaping pulse was proposed based on weight combination of prolate spheroidal wave functions matching UWB multiple sub-band spectral mask.

然后，利用PSWFs函数的特性，提出了一种基于多频带的PSWFs函数基的加权线性组合来设计UWB自适应脉冲波形的算法。

We adopt the EMD approach to decompose the iris images and select the intrinsic mode functions with proper frequency range for iris recognition.

将虹膜图像进行EMD分解，找出有利于虹膜识别的敏感频带，使用选择后的固有模态分量对虹膜图像进行特征提取。

Experimental results show these proposed methods, which can protrude the sideband structure of gear, are practical in gear fault diagnosis and of application and more thorough research value.

实验数据的分析结果表明这些方法可突出齿轮的边频带结构，适用于齿轮的局部故障诊断，具有一定的应用价值和更深入的研究价值。

According to the theory results,the two orthogonal polarized states of the fundamental mode become non-degenerate in this fiber and modal fields are quasi rectangular with appearing strongly linear polarization.And,the birefringence of the fiber was found to be due to the asymmetry of cladding structure.If the rate η between lognitudinal and transverse holes-spacing is reduced,the birefringence will increase strongly.

结果发现，矩形点阵微结构聚合物光纤基模两个正交偏振态不再简并，模场呈现类矩形且具有较强的线偏振特性；该光纤模式双折射产生于包层孔结构分布的不对称性，减小包层纵向孔间隔和横向孔间隔之比η值，双折射明显增强，适当调节η，可在更宽频带范围内实现高双折射单模运行。

Thedetailed work includes: 1、The basic theory of Ka-band power amplifier is researched, and four structures usedoften in millimeter wave Wilkinson divider, rat-race hybrid, dire...

利用放大芯片RMDA20420，制作了单片MMIC功率放大器，测试表明该放大器在工作频带内增益大于20dB，符合设计要求。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。