L-Band Synthesiser

As described in the June-2006 Scatterpoint, software for the 'Simple and Cheerful L Band Synthesiser' is here

Circuit Tools & Simulation

Avago Appcad

Free utility from Avago (formerly Agilent) covering Transmission lines, Transistor Parameters, cascaded noise etc. Its not ADS, but its free!
Download Link - 14MB

TXLine - Transmission Line Calculator

This free software from AWR analyses/synthesises microwave transmission lines for microstrip, stripline, coplanar and slotline.
Download v1.1 Here, or Newer 2003 Version

RFSim99 - Microwave Circuit Simulator

This free shareware from HyDesign can perform linear S-parameter simulation, tolerance analysis, stability circles, matching, tuning and filter design.
Download v1.05 Here - 2MB

QUCS - Circuit Simulator

Quite Universal Circuit Simulator is an Open Source circuit simulator for Windows, Mac and Linux with schematic capture, s-parameters, flexible graphing.
Download Link


Free Spice-based simulator and other tools from Analog Deices (formerly Linear Technology) with full schematic entry, libraries, custom symbols etc.
Download Link

Analog Devices

Free design tools for DDS,filters, rf calculators etc.
Download Link

EM Solvers

Sonnet Lite

Sonnet Lite is a free, limited capacity, version of a professional EM Solver for microstrip and stripline design.
Download Link

Ansys HFSS

A student version of the Ansys Electronics/HFSS 3D EM Solver suite - the High Frequncy Stucture Simulator
Download Link

CST Student Edition

A free though restricted version of the CST Electromagnetics suite
Download Link

Feko Student Edition

Feko Student Edition (with Winprop) is a free, limited capacity, version of a professional EM Solver for Antenna design.
Download Link


A free but limited 3D FDTD solver - Matlab or Octave and Python are used as an easy and flexible scripting interface
Download Link

Miscellaneous Utilities

Super Filter design program called "LC" or "Elsie"

This very useful program from Jim Tonne WB6BLD has a free version, and his website has other handy utilities.

AADE Filter Design

Free lumped/crystal filter design and analysis - archived copy:
Mirror site

G4JNT Software Archive

Courtesy of Andy Talbot G4JNT, useful Beacon and other Software utilities.
Download Link

Paul Wade W1GHZ (ex N1BWT) "On-line Microwave Antenna Book"

This large and thorough work is split into sections for easy downloading.
Link to table of contents of the "Microwave Antenna Book"