Good and simple simulation tool needed

I look for tool wich is suitable for simulation signal propagation over transmition lines. I don't need complicated features, just basic, but I want results close to reality. Small size, easy to learn and use program, wich I can download freely will be perfect!

Thanks for attention.

See the free versions of MEFisTo (3D) and EM3DS (planar):

https://www.edaboard.com/ftopic111366.html

Hi moss

its free from agilent
http://www.hp.woodshot.com/

AppCAD
AppCAD is a free, easy-to-use program that provides you with a suite of RF design tools and computerized Application Notes. AppCAD is the in-between solution, the everyday RF design tool that fills the gap between major Computer Aided Design programs and your handheld calculator. AppCAD is based on the very popular MS-DOS? version of Agilent Technologies' original RF and Microwave AppCAD "Classic".

What's in AppCAD?
Everything S-Parameters
Lumped Element Balun
Complex Math Calculator for RF
Design Data on the web
NoiseCalc System Analysis
Mixer Spur Analysis
3rd Order Intermodulation Calculator
RFICs: Voltage-Biased RFICs, Current-Biased RFICs
Schottky Detectors: Large-Signal, Small-Signal
Amplifier Efficiency Calculator
Transmission/Reflection Calculator
Transmission Lines (10 types)
Engineering Tools
Field Effect Transistor Bias Networks
Device Thermal Calculator
Designing for Reliability
Bipolar Transistor Bias Networks: Base Bias, Collector Bias, Voltage-Divider, Constant Current-Source, Voltage Divider, Emitter Feedback

PL

i think it can't design complete project like lna amplifier.
without lna design, RFSIM99 is nice. It can design filter & simulate amplifier etc. Very simple to operate.

u need cst,frendly and simple and accurate