NI AWR Design Environment
TX-LINE®* is a FREE, easy-to-use, Windows-based interactive transmission line calculator for the analysis and synthesis of transmission line structures. TX-LINE enables users to enter either physical characteristics or electrical characteristic for common transmission mediums such as:
TX-LINE runs on Microsoft® Windows® 2000-SP4, XP-SP2, Vista-SP1, and Windows® 7.
* TX-LINE is included in the Microwave Office software and it can be launched from the "Tools" menu.