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Filter Design Resources

Listed are resources for doing the design yourself. There are many magazine articles and websites with useful information that can either assist you with your own design, or convince you that it is best to find an expert to do it for you.

These companies here can supply your needs for any type of filter. They provide not only a stock of off-the-shelf models, but can also design and manufacture custom models for meeting specialty selectivity, group delay, insertion loss, form factor, power handling, or other unique parameters.

Click to visit Guided Wave TechnologyBy
Guided Wave Technology
Guided Wave Technology's Coupling Matrix Synthesis (CMS) tool facilitates synthesis of N+2 coupling matrices for Chebyshev bandpass filtering functions, with arbitrary finite-position transmission zeroes.
The CMS tool gives a fast and accurate
overview of:
   ● Filter orders up to 12
   ● Arbitrary placement of transmission zeroes
   ● Complex transmission zeroes
   ● Extended parameter plotting options
   ● S-parameter file (s2p) generation
   ● Topology matrix definition of filter circuits
   ● Advanced graph and marker functions
   ● Easily re-scalable axes
   ● Excellent overview - input/output together
   ● Saving and loading of designs
   ● Fast response
   ● Integrated manual
   ● Intuitive and very user friendly interface
Guided Wave Technology is a microwave filter R&D company, specialized in development and production of passive filter prototypes and series.

Click to visit ReactelReactel, Inc.
Gaithersburg, MD
Established in 1979, Reactel is an industry leader in the design and manufacture of RF and Microwave filters, diplexers, and sub-assemblies. We offer a line of filters covering DC-50 GHz.
The latest in CAD/CAM methods and equipment in all of our design and manufacturing processes are used. We feature a modern, well-equipped machine shop complete with multiple CNCs, which gives us the ability to produce long production runs quickly and economically.
Our testing department is equipped with the latest in Agilent Technologies Network Analyzers offering quick, dependable, and accurate measurements.
Select from Our Complete Line of Filters
  • Suspended Substrate Filters
  • Ceramic     • Wireless Bands
  • Switched Filter Banks     • Flat Pack
  • LC     • Miniature LC     • Waveguide
  • Combline & Interdigital     • High Power
  • Cavity     • Miniature Cavity     • Tubular
  • Suspended Substrate Diplexers & Multiplexers
ISO 9001 Certified / RoHS Compliant

AADE Filter Design and Analysis V 4.4 |
Free download from Almost All Digital Electronics.

A Filter Primer |
This comprehensive article covers all aspects of analog filters. By Maxim Integrated Products, Dallas Semiconductor.

Active Filter Design and Specification for Control of Harmonics in Industrial and Commercial Facilities |
Abstract by Mark McGranaghan, Electrotek Concepts, Inc.

Analog Filter Design Demystified |
This article shows how to design analog filters. It starts by covering the fundamentals of filters, goes on to introduce the basic types like Butterworth, Chebyshev, and Bessel, and then guides the reader through the design process for lowpass and highpass filters. Included are the derivation of the equations and the circuit implementation.

An Intra-Disciplinary Capstone Project in Digital Filter Design |
By Jim Armstrong, Amy Bell, and Gail Gray, Bradley Department of Electrical and Computer Engineering, Virginia Tech.

Basics of Anti-Aliasing: Using Switched-Capacitor Filters |
By Maxim Integrated Products, Dallas Semiconductor.

Custom Filter Design |
White paper from Microwave Packaging Technology, Inc.

Designing Active High Speed Filters |
From National Semiconductor.

Designing Elliptic Filters With Maximum Selectivity |
By Celestino A Corral, Motorola Inc.

Designing Filters Using the Digital Filter Design Toolkit |
Application note by Rahman Jamal, Mike Cerna, John Hanks, National Instruments.

Design of the Inverter Output Filter for Motor Drives with IRAMS Power Modules |
Application note from International Rectifier.

Digital Filter Design |
Writing Difference Equations For Digital Filters From Applied Industrial Control Solutions, by Brian T.

Digital Filter Design Tool |
This is an applet that allows you to design digital filter graphically.

EMI Filter Design and Stability Assessment of DC Voltage Distribution based on Switching Converters |
Abstract from FERMILAB.

Filter Basics: Anti-Aliasing |
This application note discusses the different filtering requirements for a sampled data system. It describes aliasing and the types of filters that can be used for anti-aliasing.

Filter Design and Analysis |
Filter design articles, tools, software, and books from Circuit Sage.

Filter Design in Thirty Seconds |
Need a filter—fast? No theory, very little math—just working filter designs, and in a hurry? This is the right document. From Texas Instruments.

Filter Design Using Integrator Blocks |
By Maxim Integrated Products, Dallas Semiconductor.

FIR and IIR Digital Filter Design Guide |
From Frequency Devices.

FIR Digital Filter Design Applet |
From DSP Tutor.

Geotextile Filter Design, Application, and Product Selection Guide | Notes/TN_geofilter.pdf
From Ten Cate Nicolon.

High-Pass Butterworth Filter Design |
From Besser Associates.

High performance and Low power FIR Filter Design Based on Sharing Multiplication |
By Jongsun Park, Woopyo Jeong, Hunsoo Choo, Hamid Mahmoodi-Meimand, Yongtao Wang, and Kaushik Roy, School of Electrical and Computer Engineering, Purdue University.

IIR Digital Filter Design Applet |
From DSP Tutor.

Implementation of High-Performance Integrated Analog Filters and Filter Banks |
Project by Lars Wanhammar, Electronics Systems, Linköping University.
Click here to visit the Networks International websiteNetworks International Corporation (NIC)
Overland Park, KS
Tel: 913-685-3400
NIC is a leading manufacturer of custom RF & Microwave Filters and Assemblies. For over 20 years, we have been a trusted partner for military, commercial & space solutions. NIC headquarters is located in Overland Park, KS with additional sales and manufacturing operations in Washington, DC and India. NIC is certified as a Small Disadvantaged Business (ISO 9001:2000)
Networks International Corp. (NIC) Filters
 • Miniature Lumped Element
 • Combline & Interdigital
 • Crystal        • Ceramic
Networks International Corp. (NIC) RF Amplifier Assemblies
RF Assemblies
 • Filter/Limiters
 • Switched Filter Banks
 • Radar Systems   • RF Modules
 • Filter/Amplifiers  • Phase Shifters
 • Diplexers           • Multiplexers
Networks International Corp. (NIC) Crystal Oscillators
Crystals / Oscillators
 • Discriminators (455 kHz to 160 MHz)
 • TCXOs and VCTCXOs
 • Surface Mount Crystals
      (1.8 MHz-200 MHz)
Space Qualified Products

Inline TM110-Mode Filters With High-Design Flexibility by Utilizing Bypass Couplings of Nonresonating TE 10=01 Modes |
Abstract by Uwe Rosenberg, Smain Amari, and Jens Bornemann.

Input Filter Design for Switching Power Supplies |
Michele Sclocchi National Semiconductor.

Introduction to Digital Filters |
A tutorial.

LC Band Pass Filter Circuit |
Overview and information about the basics of the design of an RF LC bandpass or band pass filter circuit including the design considerations and formulae (formulas) and construction tips. From

LC Filter Design |
An interactive design package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs).

LC Filters Tutorial |
By Ian C. Purdie.

LC High Pass Filter Circuit |
The design considerations and formulae (formulas) for an LC (inductor capacitor high pass filter. From

LCL Filter Design for PWM Rectifiers | Klampfer - LCL filter design.pdf
By Mike Sippola and Wolfgang L. Klampfer, Schaffner EMV AG.

LC Low Pass Filter Circuit |
The design considerations and formulae (formulas) for an LC (inductor capacitor) low pass filter. From

Low-Pass Butterworth Filter Design |
Article from Besser Associates.

Low-Sensitivity, Lowpass Filter Design |
From National Semiconductor.

Low-Sensitivity, Highpass Filter Design with Parasitic Compensation |
From National Semiconductor.

Low-Sensitivity, Bandpass Filter Design with Tuning Method |
From National Semiconductor.

Matheonics Technology |
519-578 2092 / Kitchener, Ontario, Canada
FAZA software tool for the analog filters design - free demo. Also a very extensive filter design tutorial.

Minimizing Component-Variation Sensitivity in Single Op Amp Filters |
By Maxim Integrated Products, Dallas Semiconductor.

Nonlinear Order Statistic Filter Design: Methodologies and Challenges |
Abstract by Moncef Gabbouj and Jaakko Astola, Tampere University of Technology, Finland.

Novel Designs For Elliptic Bandstop Filters |
From RF Design, by Philip R. Geffe.

Overvoltage Suppression Filter Design Methods Based on Voltage Reflection Theory |
Abstract by SangCheol Lee and KwangHee Nam.

Parks-McClellan FIR Filter Design |
From DSP Tutor.

Power Supply Output Filter Design - Overshoot |
By Jerrold Foutz, SMPS Technology.

Practical FIR Filter Design in MATLAB |
This tutorial white-paper illustrates practical aspects of FIR filter design and fixed-point implementation along with the algorithms available in the Filter Design Toolbox and the Signal Processing Toolbox for this purpose.

Quantized FIR Filter Design Using Compensating Zeros |
Article by Kishore A. Kotteri, Amy E. Bell, and Joan E. Carletta. |
Devoted to RF & microwave filter theory and design.

Microwave Lowpass Filters with a Constricted Equi-Ripple Passband |
by Dieter Pelz

Revision of Cascade Synthesis Theory Covering Cross-Coupled Filters |
by Dieter Pelz

RF Filters |
A brief description of RF and audio filters, and a lot of links to articles on the ARRL's website. By the ARRL.

Using the Analog Devices Active Filter Design Tool |
Application note from Analog Devices.

VCO Inductor and External Loop Filter Design Guidelines for the AT86RF401X |
From Atmel Corporation.

Waveguide EM Filter Analysis and Design |
From Guided Wave Technology.

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