一维零相位滤波器组的优化设计法

滤波器组理论是子带编码的基础，因而，滤波器组的设计非常重要。本文介绍了一种可以设计零相位滤液器组的方法，克服了以往的方法只能设计非零相位滤波器组的缺点，为利用MoClellan变换法设计二维滤波器组提供了可能。通过实验验证，利用该方法设计滤波器，可以容易地控制滤波器的性能，设计也比较简单，而且所设计的滤波器能够以较小的误差重建原始信号。可以认为，这是一种较为理想的滤波器设计方法。     

滤波器电路的计算机辅助设计综述

本文综述了集总参数元件滤波器电路的计算机辅助设计的发展及目前的状况。首先讨论了滤波器传输函数的逼近及机助设计情况，列出了有关带有程序清单的参考文献；然后指出了ＬＣ滤波器机助设计中的难点及解决的办法，并给出了简单滤波器设计的显式公式。对于有源滤波器的机助设计，文中分析了有源滤波器ＣＡＤ的发展及现状，阐述了开发有源滤波器设计程序所遵循的原则，对于数字滤波器，文中回顾了ＩＩＲ和ＦＩＲ数字滤波器机助设计的情况，并阐明了正交镜像滤波器的机助设计方法。     

数字椭圆滤波器的Matlab设计与实现

介绍了数字椭圆型滤波器的基本理论和设计思想，给出了设计数字椭圆型滤波器的具体步骤，并通过一个带通滤波器为例来说明数字椭圆滤波器的Matlab具体实现过程，数字椭圆滤波器的设计非常简单、直观。最后对巴特沃斯、切比雪夫、椭圆函数3种滤波器的性能进行了比较。     

微带发夹式带通滤波器的计算机辅助设计

主要论述了目前广泛应用的发夹式带通滤波器的设计技术。该设计方法不同于传统的微波带通滤波器，其理论简单，适合计算机仿真，易达到一次性设计成功的目的。最后给出了一个相对带宽为4％的五极发夹带通滤波器的设计实例，对发夹式带通滤波器的设计理论进行验证，取得了较高的一致性，为这种结构的滤波器的设计提供了一定的指导意义和参考价值。     

基于遗传算法的同轴腔EMI滤波器的优化设计

在简要介绍一种新的宽频带电磁干扰(EMI)滤波器设计思路的基础上。重点论述了高频段同轴腔EMI滤波器的设计方法。本文首先给出了高频段分布参数元件滤波器的设计原理，然后利用遗传算法对高频段同轴腔EMI滤波器进行优化设计，获取优化值，并给出了精确的设计结果，最后给出了仿真结果。     

基于FPGA的高阶高速FIR滤波器设计与实现

提出了一种基于FPGA的高阶高速FIR滤波器的设计与实现方法。通过一个169阶的均方根升余弦滚降滤波器的设计，介绍了如何应用流水线技术来设计高阶高速FIR滤波器，并且对所设计的FIR滤波器性能、资源占用进行了分析。     

S波段窄带介质滤波器的分析与设计

滤波器是现代数字通信的一个关键部件，对数字通信的影响重大。本文介绍了介质谐振器的独特优点、基本原理和分析方法，给出了滤波器的设计公式，在此基础上设计了一窄带介质滤波器，并在HFSS的基础上对设计的介质滤波器进行了仿真分析，仿真结果和理论计算一致，验证了理论计算的正确性。     

多传输零点LTCC梳状带通滤波器的设计与实现

给出了一种改进型的梳状LTCC滤波器的设计方法，该滤波器是在一般抽头式梳状滤波器设计的基础上，结合电路仿真以及三维电磁场仿真，辅之以DOE（design of experiment）设计方法设计出的一种高抑制、低插损多传输零点滤波器。该滤波器实际上采用了现今射频通信器件设计中流行的LTCC技术。该滤波器的中心频率为2.45GHz，带宽150MHz，可以广泛运用于无绳电话，蓝牙模块，以及WLAN的射频电路中。     

平行耦合线滤波器

介绍了交错平行耦合带状线滤波器的设计方法及其过程，用此方法设计了7．5～18GHz的带通滤波器，使用Microwave Office软件对此滤波器进行了仿真，并对滤波器进行了安装测试。     

基于免疫记忆克隆选择算法设计低复杂整型数字滤波器

文章提出了一种基于免疫记忆克隆选择算法设计整型数字滤波器的方法，可获得频率特性很好的数字滤波器，克服量化系数引起的滤波器性能降低问题，而且可降低滤波器实现的复杂度。设计结果表明所提出的设计方法是可行有效的。     

几种相关匹配算法性能的研究与分析

为了满足相关匹配的要求,在二元纯位相匹配滤波器的基础上,提出了几种改进的匹配滤波器算法,即优化的二元纯位相匹配滤波器算法、振幅编码位相型匹配滤波器算法及振幅补偿匹配滤波器算法,比较了这些算法的性能,分析了在不同相关匹配条件下的优势。     

A Compact Channel-Dropping Filter for Stripline and Microwave Integrated Circuits

A compact channel-dropping filter geometry is described that is particularly suited for stripline and microwave integrated circuits (MIC). The channel-dropping filter is comprised of a hairpin bandpass filter and a new bandstop filter, referred to herein as a folded-line bandstop filter. Design parameters for the latter filter for a range of bandwidths are tabulated. Analytical and experimental data for a trial channel-dropping filter are presented and discussed.     

Oversampled filter banks from extended perfect reconstruction filter banks

Oversampled filter banks are currently being proposed for robust transmission applications. In this paper, we completely characterize multidimensional doubly finite-impulse-response (FIR) filter banks, that is, oversampled filter banks whose dual is FIR. Then, we consider the problem of extending perfect reconstruction critically sampled multidimensional filter banks in order to obtain doubly FIR (DFIR) filter banks. As a result, very simple criteria for constructing DFIR filter banks as extensions of orthogonal filter banks are obtained. This paper also analyzes the problem of constructing totally FIR filter banks, i.e., DFIR filter banks that remain DFIR even when some channels are removed. It is shown that any totally FIR filter bank can be implemented as the cascade of a critically sampled DFIR filter bank whose number of channels is equal to the subsampling factor, a redundant finite-dimensional transform, and a suitable set of delays.     

Design of active transimpedance band-pass filters with different Q values

Transimpedance filter is a filter which realises a transimpedance transfer function. In this article, the design methods for the transimpedance band-pass filter are presented. The circuit topologies and parameter calculation formulas of three bi-quadratic transimpedance band-pass filter topologies with low-, medium- and high-Q values are proposed, respectively. A high-order transimpedance filter can be obtained by realising a bi-quadratic transimpedance filter first and then cascaded with voltage-mode bi-quads. A high-order transimpedance filter design example is given; the simulation and the measured results verify the effectiveness of the proposed transimpedance filter design method.     

The analysis and design of two-dimensional nearly-orthogonal symmetric wavelet filter banks

The design and analysis of two-channel two-dimensional (2D) nonseparable nearly-orthogonal symmetric wavelet filter banks with quincunx decimation is studied. The basic idea is to impose multiple zeros at the aliasing frequency to a symmetric filter and minimize the deviation of the filter satisfying the orthogonal condition to obtain a nearly-orthogonal FIR filter bank. Since multiple zeros are imposed, a scaling function may be generated from the minimized filter. With this filter, a semi-orthogonal filter bank is constructed. Methods for analyzing the correlation of the semi-orthogonal filter banks are proposed. The integer translates of the wavelet and scaling function are nearly-orthogonal. The integer translates of the wavelet at different scale are completely orthogonal. The semi-orthogonal filter bank can be efficiently implemented using the corresponding nearly-orthogonal FIR filter bank.     

Design of active transimpedance band-pass filters with different Q values

Transimpedance filter is a filter which realises a transimpedance transfer function. In this paper, the design methods for transimpedance band-pass filter are presented. The circuit topologies and parameter calculation formulas of three bi-quadratic transimpedance band-pass filter topologies with LQ, MQ and HQ are proposed respectively. High order transimpedance filter can be obtained by realising a bi-quadratic transimpedance filter first and then cascaded with voltage mode bi-quads. A high order transimpedance filter design example is given, the simulation and the measured results verify the effectiveness of the proposed transimpedance filter design method.     

两带自适应FIR线性相位双正交滤波器组设计

自适应滤波器组设计是多速率滤波器组理论和应用的一个重要方面。由于其频率响应更好匹配于输入信号的统计特性,这类滤波器组可获得更大的子带编码增益。该文研究了两带自适应FIR线性相位双正交滤波器组的设计问题,给出了设计算法,特别是通过最优IIR双正交滤波器组确定初始点(初始滤波器组)的方法。仿真结果表明,得到的滤波器组的子带编码增益远远超过了最优的IIR正交滤波器组,与已有的设计结果比较,编码增益明显提高。     

基于模式匹配法的波导滤波器分析

采用模式匹配法对波导滤波器的不连续性进行了分析,给出了模式匹配法分析波导滤波器的基本步骤,并用Matlab编写了用于计算波导滤波器S11和S21参数的模式分析程序,最后对波导对称H面膜片滤波器的S11和S21参数特性进行了计算,并对仿真结果进行了分析,总结了应用模式匹配法分析波导滤波器时应注意的一些问题。     

ICCII-based universal current-mode analog filter employing only grounded passive components

In this paper, three versions of a novel second-order current-mode (CM) single-input three-output analog filter employing inverting second-generation current conveyors (ICCIIs) and only grounded passive components, are presented. This filter can simultaneously realize low-pass, band-pass and high-pass responses, and can also realize notch and all-pass filter responses with interconnection of the relevant output currents. The presented second-order filter requires no active and passive element matching conditions and/or cancellation constraints. The proposed filter offers orthogonal control of angular resonance frequency (ω_o) and quality factor (Q). The proposed filter can realize filter responses at high output impedances, and has low active and passive component sensitivities. Additionally, three versions of a high-order filter derived from the proposed filter are introduced. Simulation results using SPICE program are given to show the performance of the filter and verify the theory. Signal limitations and non-ideal current and voltage gain effects of the proposed second-order filter are also investigated.     

On the study of four-parallelogram filter banks

The most commonly used 2-D filter banks are separable filter banks, which can be obtained by cascading two 1-D filter banks in the form of a tree. The supports of the analysis and synthesis filters in the separable systems are unions of four rectangles. The natural nonseparable generalization of such supports are those that are unions of four parallelograms. We study four parallelogram filter banks, which is the class of 2-D filter banks in which the supports of the analysis and synthesis filters consist of four parallelograms. For a given a decimation matrix, there could be more than one possible configuration (the collection of passbands of the analysis filters). Various types of configuration are constructed for four-parallelogram filter banks. Conditions on the configurations are derived such that good design of analysis and synthesis filters are possible. We see that there is only one category of these filter banks. The configurations of four-parallelogram filter banks in this category can always be achieved by designing filter banks of low design cost