NEC2 is written for input data files organized as "card decks". It is the easiest way that I found to obtain both azimuth and elevation plots. You will get used to using the GM card to rotate your models around the axes.
Normally, NEC models assume propogation along the Z axis. These are very complex models, however, and the 1k9 executable managed to run all of my complex models, even those with multiple reflectors.ĤNEC2's GUI assumes that the antenna is located along the Y axis. My slim Windows 98 OS also ran executables up to 4000 elements. You see, the 4K model uses almost all the 256K, and NEC's DRAM has to be contiguous (cannot be swapped by virtual memory). I found that Windows 2000 in a computer with 256K of DRAM can run a 4000 segment analysis, but it takes about 5 minutes to swap all its other programs out of core. NEC2D analyses antennas by dividing them up into many small segments, and calculating the current and properties of each segment. The new 3-D solids-renderer is superb.ĤNEC2 makes the NEC2 executables run automagically in a DOS window of Windows98, 2000 or XP. You can also download 4nec2, free of charge, from "The (unofficial) NEC Archives". All the diagrams in my articles (and on the home page) were created with 4NEC2. It takes the raw data in the NEC2 output files and displays it graphically in a visually usefull form. I use the 4NEC2 GUI program written by Arie. You can download the DOS executables from this link. Although some commercial versions can be purchased which run directly with the Windows GUI, the freely available versions operate in a DOS command-line drive environment. Link to my tutorial 'Antennas Enhance WLAN Security' in, October, 2001 NEC2 WLAN SIMULATION Simulation and Measurement of WLAN Antennaĭesigns using DOS and Windows author: Trevor Marshall
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