查询词典 filter passband

From the lumped equivalent circuit model, the phase shift/attenuation and impedance characteristics of the novel structure are first analysed based on the Bloch theory, which shows the novel structure has properties analogous to those of a bandpass filter: the attenuation constant keeps zero with a continuous and smooth characteristic impedance distribution within the passband and the bandwidth may be arbitrarily specified; characteristic impedance is purely imaginary with the inhibition of the electromagetic wave propagation outside the passband.

首先从一般的等效电路模型出发，根据Bloch周期性理论对该结构的相移、衰减和阻抗特性进行了分析，结果表明该新结构具有类似带通滤波器的特性：通带内衰减常数为零，特性阻抗为实数并随频率连续平滑分布，具有可任意指定的阻抗匹配带宽；带外特性阻抗为纯虚数，电磁波传播受到抑制。

Tunable passband property of the stepped-impedance resonator is used for the design of dual-band bandpass filter that can be applied to wireless local area network communication system. Design theory for this type of filter is presented.

利用阶梯阻抗谐振器的通带可调的特性，设计了可用于无线局域网通信系统的双通带滤波器，给出了设计理论。

SRC in SDR is also discussed, and two improved structures of CIC filter are presented. The first one is a CIC decimation filter based on polyphase structure and partially sharpening technique, which is suitable for the situation where the requirements in passband attenuation is not very high while the requirements in alias suppression and operating speed are relatively high. The other one is an improved CIC-Rotated Sinc decimator which possesses improved frequency response, low operating rate and low cost in hardware as well.

研究了软件无线电中的采样率转换技术，给出两种改进的CIC滤波器结构；(1)基于多相结构和部分尖锐化的CIC抽取滤波器，该结构适用于通带衰落要求不是很高，混迭抑制和滤波速度的要求相对较高的场合(2)一种改进CIC-Rotated Sinc抽取滤波器，该结构在获得好的通阻带特性的前提下，一方面降低了整个CIC滤波器结构的工作速率，另一方面尽可能地降低硬件实现的复杂度。

The loss compensation is only activated at the filter's passband, and the insertion loss could be adjusted without affecting the filter's center frequency and 3-dB bandwidth.

共震器的损耗补偿只作用於主动滤波器的导通频段内，而且介入损失的调整并不影响到主动滤波器的中心频率与 3 dB频宽。

It is shown that, the impact of IPI due to the pre-filter is insignificant to noncoherent receiver, and there exist different optimal pre-filter passband widths for different channels and input SNRs.

结果表明，在信道模型CM1~CM4下，前置滤波器产生的多径分量干扰平均来说对其输出能量的影响很小，并且一般来说存在一个最佳的滤波器带宽值。

On the other hand, when the optical filter detunes from the laser wavelength a little, a narrow notch filter with flat passband is realized.

此结构通过调节可调谐窄带滤波器的中心波长可实现高Q与通带相对较平的陷波频率响应的切换。

And a excellent narrow-band filter will be produced with a low-pass and a high-pass filter at the passband congruence.

采用一个低通滤波器和高通滤波器在其通带叠合处便可产生一个优良的窄带滤波器。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。