4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler. When running frequency sweeps, linear or logarithmic style SWR, Gain, F/B-ratio and impedance line-charts are produced. With the included Optimizer and Sweeper one is able to optimize antenna- and/or other environment-variables for Gain, resonance, SWR, efficiency and/or F/B, F/R-ratio. With the sweeper one is able to graphically display the effect of changing one or more of these variables for a specified range of values/frequencies. For the starting modeler agraphically based 3D geometry-editor is included which requires no additional NEC knowledge while still enabling you to create and visualize and compare current-distribution, far/near-field patterns and Gain/SWR charts. More experienced modelers can use the gradient style and/or the genetic algorithm based optimizers to improve their designs.
EZNEC and EZNEC+ are powerful but very easy-to-use programs for modeling and analyzing nearly any kind of antenna in its actual operating environment. EZNEC plots azimuth and elevation patterns; tells you gain, feedpoint impedance, SWR, and current distribution; finds and reports beamwidth, 3-dB pattern points, f/b ratio, takeoff angle, sidelobe characteristics; and more. All information, including patterns, can be displayed on screen or printed on any Windows compatible printer. And it's easy to use with EZNEC's menu structure, spreadsheet-like entry, and many shortcut features. You describe the antenna (and other nearby structures if desired) as a group of straight conductors, choosing the orientation, length, and diameter. Add sources at the feedpoints and, if desired, transmission lines, a realistic ground, and loads to simulate loading coils, traps, or similar components. Using this description method, you can quickly analyze Yagis, quads, phased arrays, towers, loops -- nearly any type of antenna or parasitic structure. Antenna descriptions and pattern plots are easily saved and recalled for future analysis. Multiple patterns can be superimposed on a single graph for comparison. See the pattern and antenna currents on the same color 3-D display as the antenna. Rotate the antenna display and zoom in for details. Want to make a change? EZNEC makes it simple
MMANA-GAL basic is an antenna-analyzing tool based on the moment method, which was introduced in MININEC. The program provides ability for changing the language of signs and messages of the program.able-based editor for antenna design and definition Graphical antenna viewer Viewer for horizontal and vertical beam radiation patterns 3D radiation pattern Comparator for two or more "calculation" results Antenna element editor Antenna wire editor Tools for defining the combination of elements with different diameters Automatic antenna optimizer with respect to jX, SWR, Gain, F/B, Elevation, and Current Ability to browse optimized results with manual tuning capability Frequency characteristics chart maker Data file generator