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4nec2 Antenna Creating Software

1. Graphical 2D and 3D visualization of Far- and Near-field data and Geometry strutures (including circular polarization view).
2. Line-chart visualization for freq-sweep Gain, F/B, F/R, SWR and impedance data.
3. Drag and drop style Geometry Editor to assist the starting antenne modeller.
4. Full Nec2 and Nec4 command support, including GX, GM, GR, GA, GH and surface patches.
5. Capable of running up to 11000 wires and/or segments (limited by the max of 2Gb of windows on-board memory)
6. Support for inclusion of surface-wave component in far-field data.
7. 3D geometry display for surface patches included.
8. Variable substitution included for complete Nec2/4 command set enabling you to model by equation.
9. Sophisticated real-time 3D geometry and pattern viewer showing real wire-radius.
10. AO-style gradient/hill-climbing optimizer included.
11. Genetic Algorithms based optimizer included.
12. Automatic variable sweeper with line-chart output.
13. Automatic convergence tester with line-chart output.
14. Interactive Smith chart visualization for freq-sweeps.
15. Integrated Sommerfeld ground calculations with frequency-sweep.
16. Automatic generation of VOACAP propagation prediction type 13 and –14 antenna files.
17. Automatic coversion of AO (.ant)and EZnec (.ez)input files.
18. ‘Insulated-Wire’ and 'LC-trap' loading-types included.
19. Automatic conversion for feet, inch, #awg to meters and elevation/azimuth to phi/theta and reverse.
20. Batch processing for automatic testing, calculation and/or conversion of multiple Nec, AO and/or EZnec input-files.
21. Extensive segment- en geometry validation, such as: Intersecting volumes, Short/thick wires at sharp angle, Unequal segmentation for parallel wires, Too low hight, Large radius or length changes at junctions, etc.
22. Screen grabber for easy cut/paste, print or save parts of the screen, window or form.
23. Geometry builder to create cylindric, patch, plane, box, helix and parabola shaped structures using auto-segmentation and/or equal-area rules.
24. Automatic generation of Stub-, L-, Pi- and Tee-matching-networks (low- and high-pass)
25. Visualization of circular polarization components E(left) and E(right) for far-field.
26. EZnec style MiniNec ground included.
27. Capable of running the default Lawrence Livermore National Laboratories Nec4 engine.
28. Running on all systems from early Windows-95 to latest Windows-Vista
29. More than 450 example files
30. Context sensitive Help-file.
31. Completely free.

• Intuitive to use: VCR like controls, Drag and Drop, Tip of the Day,
• Tool Tips, Comprehensive Online Help.
• Interact instantly with your MultiMedia Logic circuits.
• Learn an internationally recognized philosophy, Logic Design.
• Supports networking over the Internet.
• Supports a programmable Robot device.
• It's also FREE.

Features

• It is free! (Logisim is open-source (GPL).)
• It runs on any machine supporting Java 5 or later; special versions are released for MacOS X and Windows. The cross-platform nature is important for students who have a variety of home/dorm computer systems.
• The drawing interface is based on an intuitive toolbar. Color-coded wires aid in simulating and debugging a circuit.
• The wiring tool draws horizontal and vertical wires, automatically connecting to components and to other wires. It's very easy to draw circuits!
• Completed circuits can be saved into a file, exported to a GIF file, or printed on a printer.
• Circuit layouts can be used as "subcircuits" of other circuits, allowing for hierarchical circuit design.
• Included circuit components include inputs and outputs, gates, multiplexers, arithmetic circuits, flip-flops, and RAM memory.
• The included "combinational analysis" module allows for conversion between circuits, truth tables, and Boolean expressions.

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.

• 1500 segments vs. 500 for the standard program -- allowing very complex antennas to be analyzed.
• Circular polarization far field analysis in addition to the linear polarization capability of the standard program.
• Double-precision calculating engine in addition to the standard mixed-precision engine.
• Easy importation of wire coordinates (GW lines) from NEC-format files.
• Additional SWR sweep displays: Smith chart, return loss, and reflection coefficient magnitude.
• 10,000 frequency sweep steps vs. 1000 for the standard program.
• Writes input files for IONCAP/VOACAP propagation programs.
• Additional wire duplication and manipulation features.

• Design entry using schematics, block diagrams, AHDL, VHDL, and Verilog HDL 
• Floorplan editing 
• LogicLock incremental design 
• Powerful logic synthesis 
• Functional and timing simulation 
• Timing analysis 
• Embedded logic analysis with SignalTap II Logic Analyzer 
• Software source file importing, creation, and linking to produce programming files 
• Combined compilation and software projects 
• Automatic error location 
• Device programming and verification