查询词典 band filter

Finally, their application to millimeter wave circuits are also dealt with. For this, a bandstop filter and directional filter obtained by coupling whispering gallery mode dielectric resonators to microstrip are presented at Ka-band.

本学位论文共分六章，各章内容如下：第一章简述了介质谐振器的发展及其在毫米波段的局限，概述了边廊模介质谐振器的发展背景、优点以及在毫米波电路中的应用前景，并介绍了其研究历史和现状。

The semaphore source of electrocardiogram is in the performance of high resistance, small breadth and low frequency, due to which the heart electricity should be dealt with amplificatory circuit、low-pass filter and band-elimination filter which are correlated to.

心电信号具有阻抗高、幅度小和频率低等特点，针对这些特点，采集的心电信号通过放大电路、低通滤波器和带阻滤波器等相关处理。

The frequency response transformation from a lowpass to a band pass filter is given, the change of the filter susceptance with frequency being taken into account.

给出了低通到带通的频响变换式，这个变换式考虑了滤波器电纳随频率改变。

The function of 3dB fiber loop mirror in fine wavelength partition is studied. With this theory, a novel narrow linear band, dual-wavelength switchable Er-doped fiber laser is realized.2. An unpumped Er-doped fiber and broadband fiber Bragg grating with high reflectivity is served as an auto-tracking filter, where the space hole-burning effect appears when the laser signal travels and forms standing wave, thus the generation of multi-longitudinal-mode is suppressed. Then the high birefringence fiber loop mirror is introduced to act as comb-liked wavelength filter.

主要包括：1、发现3dB光纤环镜的精细波长分割作用，并利用这种分割机制，研制成功一种窄线宽、双波长可转换的掺铒光纤激光器。2、利用未受泵浦的掺铒光纤以及宽带高反射率的光纤布喇格光栅做自动跟踪滤波器，当穿行其中的激光信号构成驻波时，出现了空间烧孔效应，从而抑制了多纵模的产生，引入高双折射光纤环镜做梳状波长滤波器。

Because of the convolving effect between auto-tracking filter and the comb filter, the narrow linear band, multi wavelength optical fiber laser is acquired.3、A design of introducing a polarizer into the Michelson cavity is presented, which lead to further improvement of the coherent combinative effect. Moreover, the necessity to introduce such a polarizer is analyzed qualitatively in theory.

进而利用二者之间的卷积效应，研制中一种新颖的窄线宽多波长的光纤激光器。3、提出在Michelson式结构中引入起偏器，使激光相干合成效果得到了进一步的提高，而且从理论上定性分析了引入起偏器的必要性。

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Bubble function is a band pass filter in the frequency domains, while it can't have the ability to adjust bandwidth of filter.

Bubble函数在频域里相当于一带通滤波器，它可以反映不同的时域、频域特性，但它不具有调节带宽的功能。

In order to effectively separate the fluorescence produced by algae chlorophyll-a and the scattering light from the excitation light, the interference filter with high block coefficient and narrow band is used as spectral filter.

4为了有效地分离海藻内叶绿素a所产生的荧光和激发光的散射光，采用高阻塞系数的干涉滤光片作光谱滤光。

In chapter 6, composite wavelets is first put forward and used to design digital filter by the author, this filter based on composite wavelets has the flattest band pass performance.

从小波良好的带通滤波性能出发，首次提出组合小波的概念，并用于数字滤波器的设计，得到了具有最平坦通带特性的组合小波滤波器。

First we give the analysis of the receiver front-end block diagram, link budget and specification allocation. Then, all the sub-circuits , including low noise amplifier, waveguide-to-microstrip transition , image reject band--pass filter, low-pass filter, and sub-harmonic mixer , are described in details.

在接收机组成方案分析，链路计算及指标分配的基础上，结合理论计算和计算机仿真，给出了各单元电路(包括探针式波导-微带转换器，低噪声放大器，镜频抑制带通滤波器，分谐波混频器，低通滤波器等)的设计和仿真结果。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了