image002Cascade is a scattering matrix program for the design of microwave and millimeter wave circuits and components. Scattering matrix analysis revolutionized the design ofovermoded gyrotron circuits and is now used for designing waveguide components, including pillbox and coaxial windows, mode converters, tapers, and transitions.

Scattering matrix codes generate the scattering matrix by calculating the coupling coefficients between transitions, including the effects of dielectrics. The input is simple, and the analysis typically takes only a few minutes. The accuracy typically exceeds that obtained with mesh type codes, such as HFSS and Eminence, and requires a fraction of the time to obtain a solution. The analysis can also find and identify trapped resonances generated by ghost or trapped modes.

image004The code will facilitate development of waveguide and circuit components consisting of circular, coaxial, or rectangular waveguide sections. A user-friendly, intuitive, graphical user interface facilitates user input and post processing with material properties for several standard ceramics built into the user interface. Output includes the complete mode composition throughout the problem domain. This allows the determination of the scattering matrix parameters, electric field profiles, resonant frequencies and Qs, VSWRs, electric field gradients, mode content, and ohmic loss.

Other features were recently incorporated. The code can be used to design smooth wall mode converters and tapers. Scattering parameters can be entered from other programs, such as Ansoft Corporation’s High Frequency Structure Simulator, to allow waveguide system design incorporating components requiring 3D finite element analysis. In addition, scattering parameters can be entered from experimental measurements and the waveguide components optimized for specific types of performance. Several optimization routines are built into the program, and others can be easily linked in by users.

Features List

Cascade v4.0 includes the following features:

  • Analysis of rectangular, circular or coax waveguide sections (in any order)
  • Full optimization capability
  • Statistical tolerancing analysis
  • Import of external scattering matrices (HFSS, measured)
  • Linear/cubic spline interpolation of arbitrary shapes
  • Cubic spline optimization
  • Dielectric medium, finite conductivity
  • Alternative mode sets for ghost mode

Cascade v4.0 has a new UI and additional plotting package. Existing v3.0 users require a new license key to use this version.

Research is ongoing to add additional capabilities.

Current Users

  • Communication Power Industries (CPI)
  • L-3
  • Teledyne
  • Raytheon
  • NASA
  • Jet Propulsion Laboratory (JPL)
  • Naval Research Laboratory (NRL)
  • MDS
  • TMD (formerly Thorn EMI)
  • Northrop Grumman


$5000 per copy. Please contact us for more details.


(Please contact us for licenses)

Click on link below to download Cascade Version 4
Download User Manual for Cascade Version 4.0