CMS - Filter & Coupling Matrix Synthesis Software

  • A tool tailored for filter engineers, system designers and students

  • Gives an exact overview of main filter parameters in seconds 
    without complex circuit  models and modeling

  • Designed by filter engineers for filter engineers

Current CMS release: Ver 4.0

 
 Guided Wave Technology's Coupling Matrix Synthesis (CMS) software facilitates synthesis of N+2 coupling matrices for Chebyshev band pass filtering functions, with arbitrary finite-position transmission zeroes.

The CMS software allows placement of complex transmission zeroes, which opens up for group delay shaping.

 
Main features:

filter orders up to 12

arbitrary placement of transmission zeroes

complex transmission zeroes - e.g. group delay shaping and analysis

extended parameter plotting options - e.g. mag/ phases of S11 and S21, group delay, table listing

s-parameter file (s2p) generation e.g. as input in system simulator

topology matrix definition of filter circuits - no topology limitations

advanced graph and marker functions - e.g. marker lines & mouse courser read-out

easily re-scalable axes

excellent overview - input and output parameters are viewed at the same time

saving and loading of designs

fast response

integrated manual

intuitive and very user friendly interface
News in Ver 2.0:

Check plot of synthesized characteristics, i.e. ability to compare design goal with actual obtained characteristic

The values in the coupling matrix may be edited and the corresponding S-parameter curves plotted.

Coupling matrix values may be displayed in different formats - e.g. bandwidths/ resonance frequencies
News in Ver 3.0 & 3.1:

Monte-Carlo Analysis on couplings

Extended Coupling Matrix editing functions by mouse right-click - e.g. sign change, coupling zeroing, etc.

Coupling Matrix export to text file for use in e.g. circuit simulators
News in Ver 4.0:

Circuit diagram representation of coupling matrix for better overview.

Loaded Q and stored energy plots for all resonators. Necessary tool for power handling analysis.
     The ability to edit coupling coefficients may be used for:

  • zeroing of very weak couplings in order to see if they can be omitted in a physical filter

  • change of coupling signs

  • investigation of other N+2 coupling matrices e.g. in the literature

  • analysis of where unintended couplings may arise from in a physical filter

  • sensitivity analysis of critical couplings
Below: Monte-Carlo analysis on coupling coefficients.
Same variation applied on three different topologies
Two cascaded Triplets Folded                  Cul-de-Sac      

The software gives a fast and accurate overview of

  • Insertion loss

  • Isolation

  • Group delay

  • Phase

  • Coupling coefficients

  • Stored energy per resonator

versus 

  • Filter order

  • Return loss

  • Resonator unloaded Q

  • Transmission zero positions

  • Topology


CMS is intended for engineers, system designers, lecturers, students and others who are engaged in design and analysis of microwave filters from both component and system point of views. 

The software is intuitive and simple to operate and requires only basic knowledge about filters and filter terms. 

The resonance characteristic of a single resonator in CMS is 100% symmetric and couplings are assumed constant versus frequency. The calculated characteristics are therefore most accurate for narrow band filters with resonating elements which have symmetric characteristics.

Check out accuracy and utility with the following examples:

Triplet dielectric resonator filter

8 pole cross coupled combline filter

Group delay shaping - introduction+advanced

Topology investigation by Monte-Carlo Analysis

Changing signs of couplings
   

“My PhD students have been using GWT's coupling matrix software for the design of  Asymmetric   Band pass Filters. The ability to place arbitrary poles has been extremely useful.”

Ian Hunter
 Professor and Director of Research
School of Electronic and Electrical Engineering
University of Leeds
UK
 

“The CMS filter software from Guided Wave Technology has become an invaluable tool in our  filter development. Due to its intuitive and simple user interface the task of simulating and predicting filter performances is no longer restricted to a few specialists in our organization.

The speed and accuracy of this tool allows us to investigate more filter topologies than ever,  thereby assuring that the best filter solution is always found for a given problem.
A highly recommendable tool”

Kristian Lotz
Group Leader, Filters & Combiners
Combilent A/S

  Some customers:

 
The 'engine' in the software is based on the Coupling Matrix Synthesis Tool, which is available online at this site and which has been used by thousands of engineers and students for years, which means that the software is based on well proven and tested principles.
To find out more about the CMS software - take a look in the manual, or browse the keyword index for subjects.

Download a trial version locked to filter order 5 - but otherwise with full synthesis functionality (6 MB).
 

Current SW: Ver 4.0

OS requirements: Windows 2000/NT/XP/Vista*
Java must be installed on your system (32 bit JRE)
 

* Verify on your PC that the Demo version runs satisfactorily before purchasing the full version
  On Viata you may have to run the program as Administrator (right click on CMS icon).
The full version of the CMS software supports filter orders up to 12 and will be locked to the hardware on your PC.
 
A single user license for the CMS tool costs US$ 995.-
Quantum discount available above 4 licenses.
 

If you decide to purchase the full version - use the button below and follow instructions. 
After having paid (PayPal) you will receive an E-mail with a link for downloading the software.
If you do not want to use PayPal please contact us and we will arrange for a bank transfer. 
 
The first time the software is used after installation you will have to activate it through a 'one-click' procedure. Within 24 hours after activation a license file will be forwarded to you. The license file must be placed in the installation directory.