带通滤波器

Furthermore,a quick way of selecting related parameters and a digital simulation of active band-pass filter single or two in series are given.

但理想带通滤波器仅在理论上存在，实际设计和应用的带通滤波器只能尽可能地逼近理想的带通滤波器。

A good demonstration of adaptive filtering procedures, including band-pass filter fixed and variable bandpass filter demonstration.

详细说明：一个不错的自适应滤波演示程序，包括固定带通滤波器和可变带通滤波器的演示。

The structure and characteristic of the band-pass filter are analyzed,and parameters of components are calculated,and a Back-EMF zero-cross detection circuit for BLDC motor sensorless control is designed in this paper.

分析了带通滤波器的结构、幅频和相频特性，计算获得了符合要求的参数，设计了由带通滤波器构成的无刷直流电动机无位置传感器控制用反电动势过零检测电路，并给出了该检测电路的简化型式。

In order to avoid the cumbersome design,the bandpass filter is indierect designed by relationship between it and lowpass filter.

摘 要：为了避开直接设计带通滤波器的繁琐设计步骤要求，利用低通滤波器与带通滤波器的关系，间接设计带通滤波器是创新之处，即通过设计简单的低通滤波器从而达到设计带通滤波器的要求。

Researching on the filter structure on the performance of it. Thus find a more reasonable model of the structure to achieve bandpass filter function. This paper used in the theoretical analysis and simulation software.

论文主要是研究带通滤波器的设计和仿真，同时也对带通滤波器的性能和结构进行了分析，研究了滤波器结构上对其性能的影响，从而找到一个比较合理的结构模型来实现带通滤波器的功能。

With this structure,L waveband conventional microstrip interdigital bandpass filter has been improved based on SIR structure.

利用SIR增加了设计滤波器的灵活度，实现了对L波段传统微带交指带通滤波器的改进，得到了基于SIR结构的新型微带交指带通滤波器。

The excellent agreements between simulated and measured results prove the accuracy of the established circuit model. Moreover, the varactor was added to the resonator to adjust its resonant frequency. As expected, the reactance introduced by the varactor indeed affects the net inductance and capacitance obviously. It is noted that, not only the shift with the center frequency, the inductive or capacitive of the reactance can also provide a parameter to switch its frequency toward the two directions away from the one without varactor. As a consequence, a wideband tunable band-pass filter is achieved. Although the bad quality factor with the diode strongly increases the insertion loss, this concept was proved to be available for effectively tuning the center frequency of such a class of band-pass filter.

另外，在共振器上的varactor是用来调整共振器的共振频率，如预期的，由varactor所造成的电抗确实的影响到共振器的总电感和电容值，值得一提的是，不仅滤波器的中心频率可以被改变，这电抗是电感性或是电容性也将决定滤波器的中心频率将大於或小於未加varactor时滤波器的中心频率，利用这个结果，我们也实现了一个宽的可调频率带通滤波器，虽然不理想之二极体的Q值增加了滤波器的介入损失，但这原理是被证明可有效的用於调变带通滤波器的中心频率。

The impedance ratio and the meander could control the frequency of the second harmonic and the baseband ratio. According to that,we analyze several kinds of stepped impeedance resonator and use them to design the dual-band bandpass filters.In the thsis , The proposed bandpass filters and dual-band bandpass filters are designed for IEEE 802.11a/b wireless communicatuon system.

双频带带通滤波器是利用步阶阻抗谐振器之阻抗比与传输线之折线，可用来控制第二次谐波的频率与基频通带的比值，藉由改变阻抗比，来求得所要的第二次谐波，利用此特性，其中分析了几种不同形式的步阶阻抗谐振器，皆可用来设计双频带带通滤波器，带通滤波器与双频带带通滤波器是针对IEEE80211a与IEEE802.11b无线区域网路所设计。

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The illustrated examples include a lumped element, Chebishev, bandpass filter using p- type resonators, a coaxial cavity bandpass filter using l/8 resonators with capacitive tuning, a coaxial cavity bandpass filter using l/4 resonators and a half wavelength via-hole direct-coupled filter.

被说明的例子包括一台lumped 元素、Chebishev 、带通滤波器使用p-类型谐振器，一台同轴洞带通滤波器使用l/8 谐振器以电容定调，一台同轴洞带通滤波器使用l/4 谐振器并且半波长通过孔指挥被结合的过滤器。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。