RFSim99 is a freeware software that can help you in RF simulation, in your projects, especially if you are trying to design radio filters.
RFSim99 works with S-parameters. This means that not only will it simulate and analyse circuits built out of its internal library of components, but that it can accommodate any circuit block or stage for which these are known.
Installing RFSim99 on Windows 7 64-bit OS
Here is how to make RFSim99 work on Windows 7 64-bit OS. You must be running Windows 7 Professional OR Windows 7 Ultimate. Upgrade if you are running anything less. Next, download the Windows Virtual XP Mode for Windows 7 64-bit OS from Microsoft. This will allow you to run any XP program from Windows 7, 64-bit OS. It can be downloaded from Microsoft here: http://www.microsoft.com/windows/virtual-pc/download.aspx . Next, install RFSim99 under the Virtual XP Mode. It works great.
Best regards,
Chris Hudgins
RFSim99 software screenshot
Video presentation of the software
Please write your opinion and give us a feedback in the comments section about this great rf simulator tool. Did you encountered any problems with it?
The video below shows a Tuchstone s-parameter s2p file that was generated on a homebrew N2PK VNA being simulated in RFSim99. The s-parameter s2p file is for a ITT 10.7MHz roofing filter.





Good software
Installation on w7 is actually much simpler than described above.
What doesn’t work on w7 is setup program – but application itself runs without problems.
So, all you need is to copy sim99 program folder (with it’s content) from another computer, and to create necessary shortcuts (if you wish).
Awesome software for any RF tech or Engineer to do proper design on the cheap. I like the way let’s open your S-paramters from you Network Analyzer and match the impedance with circuit type and values.
Dear RF tech can you explain How to match the S parameters values with the Equivalent circuit to extract the values.
very good.thanks
a very good software
A very useful software
Very good software,i use this software long time for my radioamateur hoby. Thanks
I wasn’t able to install on my Windows7 64-bit OS. Will there be a version to support that?
Hi, From memory, I 1st installed RFSim99 onto a Windows xp laptop then copied and transferred it to my Windows 7 64 bit laptop.
It’s a very complete (and Free) RF software. Thanks
I’ve used this SW off and on for several years. It is very straight forward and provides a number of good calculators for matching and filters. It’s inductor calculator is also usefull covering both hand wound and printed version. Similarly the microstrip calculator is handy for determining 50 ohm tracks on G10
Muy bueno y funciona en linux con el simulador Wine
gracias
ok…..ok…..ok
I love this software, I have used to help in to create commercial products and it works great. It is so easy to use, and it gives very accurate results.
Esta muy bien este programa, lo utilizo bastante seguido.
VC
no list 0f transistor componen. but this software is good
Genius. Just used this software to design a comms system – many thanks.
no me anda en win7, alguien sabe como se puede hacer?
very good software
Thanks
I seem to have a problem installing under Windows 7. I have tried to make sure it is not being “blocked”. I get the winzip extractor box, but then it says “unable to run setup.exe”.
I’m also having trouble downloading onto Windows 7 64-bit.
when i downloaded in my windows 7 (home basic)32-bit operating system, i couldn’t get the HELP section.
Has anyone managed to get this working on windows 7?
I tried to extract the file with a different extractor but still didn’t have any luck. I have tried this with different versions of windows on multiple machines. I have also tried in compatibility mode with all older versions of windows.
any more suggestions?
@404wibbs
Windows 7 Solution:
http://www.eyou.com.au/product/rfsim99/
Installing on Windows 7 64-bit OS
Chris Hudgins (18.09.2010 06:11:24)
Here is how to make RFSim99 work on Windows 7 64-bit OS. You must be running Windows 7 Professional OR
Windows 7 Ultimate. Upgrade if you are running anything less. Next, download the Windows Virtual XP Mode
for Windows 7 64-bit OS from Microsoft. This will allow you to run any XP program from Windows 7, 64-bit
OS. It can be downloaded from Microsoft here: http://www.microsoft.com/windows/virtual-pc/download.aspx .
Next, install RFSim99 under the Virtual XP Mode. It works great.
Best regards,
Chris Hudgins
I have had no success in downloading this
program for windows 7..does it work for windows 7 and how is it downloaded
Nice tool. Although I have to study how to use it to design an BLF177 MOS VHF output match 70MHz / 50MHz.
I could not install under WIN7pro64.
Great software. Was looking for something like this! AND it does work on Windows 7 following the above directions.
u r really good..
Thanks a lot.
This is very good tools for RF simulation.
Thanks a lot.