带通滤波器

The design process is simple and can be simulated by the sophisticated SAW unit electrode and interdigital parameters.The parameters adjustment is very simple when filter center frequency and bandwidth changes.

设计过程简洁，可采用成熟的SAW单元电极和叉指参数进行计算机模拟，且当所设计的滤波器通带频率和带宽变化时，参数调整方便。

The stopband error of prototype filter is used to be the objective function for optimization. Instead of the method of least square approximation, this paper introduce the method of best uniformity approximation.

选择低通原型滤波器最大阻带衰减为优化的目标函数，通常的优化目标函数选用最小平方逼近的方法，本文提出了使用最佳一致逼近的方法。

Simulation results show that the Filter and VGA system has gain of 6~48 dB, variable gain of 42 dB,6 dB/Step, THD54 dBc at 100 mV peak-to-peak input voltage, IIP3 of-6.35 dBV. The NF is less than 25 dB and current dissipation is 30 mA from 1.8 V voltage supply.

电路的仿真结果表明滤波器和VGA系统的增益为6~48 dB，可变增益为42 dB，6 dB/step，在输入电压峰峰值为100 mV时THD小于-54 dBc，线性度为-6.35 dBV，噪声系数在通带内小于25 dB，消耗电流为30 mA。

The filter banks are designed based on teh low pass subband energy maximum according to the statistics of the signal.

文中根据信号的统计特性，按照低通子带能量最大化的原理设计自适应滤波器组。

A new optimal design of interleaves based on cascaded Mach-Zehnder interferometers is also presented. As compared with the two existing methods (digital signal processing methods and Fourier filters), the present method is simple and intuitive.

本论文分析了Mach-Zehnder干涉仪级联形式之间的关系，提出了通带平坦化分叉复用器的新型设计方法，与现有两种方法(应用数字滤波器设计方法以及傅立叶展开法)相比较，本文提出的设计方法直观、简单。

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。

Increase of the regularity of interpolating scaling functions efficiently improves the approximation power of systems, moreover, that of dual scaling functions markedly enhances the smoothness of duals and improves the frequency characteristics of analysis filters in passband and stopband.

内插尺度函数正则度的增加有效提高了系统的逼近能力，对偶正则度的提高显著增加了对偶尺度函数、对偶小波的光滑性，改善了分析滤波器组的通带、阻带特性。冗余度在一定意义下制约了小波系统的性能。

The paper extended researches the microstrip six-port net project deeply, ADS tools are adopted to model and simulate this project, and then the paper analyses the characteristic of radio channel both transmitter and receiver, analyses the extended transmission bands and simulates the adaptability, then designs lumped-distributed microstrip filter.

文中对微带六端口射频通道方案进行深入的扩展分析，采用ADS建模及仿真研究，分析了发射通道和接收通道的特性，通过对通频带扩展及适应性仿真的分析，设计了集总—分布式微带滤波器，最后也与零中频混频方案比较了各自的差异性。

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。