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Here are some software to help model antennas.
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 a graphically 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

GOLDEN ENGINEERING

AN-SOF is a comprehensive software tool for the modeling and simulation of antenna systems and general radiating
structures. It can be used

- to learn more about antennas
- to get insight into the behavior of a particular antenna
- to design better antennas
- to predict antenna performance
- to tune for performance
- to try several possibilities before building the real model

The program is based on an improved version of the so-called Method of Moments (MoM) for wire structures. The modeling of the
structure can be performed by means of the AN-SOF specific 3D CAD interface. Electromagnetic fields, currents, voltages, input
impedances, consumed and radiated powers, gain, directivity, and several more parameters can be computed in a frequency
sweep and plotted in 2D and 3D graphical representations.

AN-SOF is an antenna simulation software that allows us

- to describe the geometry of the antenna
- to choose construction materials
- to describe the environment and ground conditions
- to describe the antenna height above ground
- to analize the radiation pattern and front-to-back ratio
- to plot directivity and gain
- to analize impedance and SWR (Standing Wave Ratio)
- to predict bandwidth

and to get several more parameters and plots.

GENERAL DESCRIPTION
KEY FEATURES
MODELING OF METALLIC STRUCTURES
EXCITATION METHODS
FREQUENCY OPTIONS
DATA INPUT
DATA OUTPUT

AN-SOF has integrated graphical tools for the convenient visualization of the simulation results:

AN-XY Chart: This is a chart for plotting two related quantities, that is Y versus X. This tool permits plotting frequency-dependent
quantities, such as current, voltage, impedance, reflection coefficient, VSWR, radiated power, consumed power, directivity, gain,
radiation efficiency, radar cross section, etc. The current distribution on metallic structures can also be plotted as a function of
position with this program. Besides, 2D radiation patterns can be represented for a near- or far-field as a function of a chosen
angle or distance. Zoom with mouse support and several unit systems for the plotted results are available. 

AN-Smith: The famous Smith chart for the representation of impedances and admittances is implemented in this tool. An
impedance/admittance curve in the Smith chart is obtained when frequency is varied. The frequency corresponding to each data
point in the chart can easily be obtained by clicking with the mouse on the screen. Reflection coefficients and VSWR (Voltage
Standing Wave Ratio) are also showed. Plots can be stored in independent files and opened later for a graphical analysis with
AN-Smith.
AN-Polar: Radiation and scattering patterns versus azimuth or zenith angles can be represented in this polar diagram, from
which the width of radiation lobes and front-to-back ratios can be obtained. The represented field quantities include power
density, directivity, gain, normalized radiation pattern, total electric field, field polarized components, and RCS.
AN-3D Pattern: A complete view of the radiation and scattering properties of a structure can only be achieved with a fully angle-
resolved pattern. This task can be accomplished with AN-3D Pattern, which implements colored mesh and surface for the clear
visualization of radiation lobes, including a color bar-scale indicating the field intensities over the lobes. Zoom, translation and
rotation of the 3D pattern can be performed. The represented quantities include the power density, normalized radiation pattern,
directivity, gain, total field, linearly polarized field components, circularly polarized field components, and RCS. Linear and
decibel scales are available.

EMCoS Antenna VLab
EMCoS Antenna VLab is a powerful simulation software especially suited for antenna calculations. The powerful CAD interface
gives you manifold possibilities to design even very complex antennas in short time. Sophisticated simulation cores based on
the Method of Moments, optimized for sequential and parallel computations, deliver accurate results.

FREE Student Version of EMCoS Antenna VLab supports full electrodynamic solution for the models with size up to 2GB! To
request free student version, please fill in the application form.

Main Features
Materials

Isotropic Lossy Electric and Magnetic Materials
Large metallic structures
Lossy wire-antenna structures
Sources, Loads and Ports

Frequency dependent circuit load elements
Equivalent network (scattering, chain, TL) element
Voltage and current sources in frequency and time domain
Plane wave excitation
Hertzian electric and magnetic dipole source
Field pattern source
Impressed current source
Unique feature - near field source
Advanced CAD and Meshing Functions

Boolean operations (union, intersect, subtract) for complex models creation
Transformation operations (translate, rotate, mirror) on CAD models
Multiple transformation operations
Removal of faces in complex models
Assignment of different meshing size to edges and faces
Meshing of CAD model considering meshing sizes
MoM Simulation

3D-field solver
Full-wave Simulation of 3-D Structures
Both Windows and Linux Versions of the MoM Simulation Engine Available
Matrix partitioning method
Multi-excitation method
Post Processing and Visualization

Currents, Voltages, Charges and Calculation Errors in Probes
Antenna Parameters (Input impedance and admittance, input and radiated power, VSWR, Gain and Directivity, Antenna
Efficiency, S11 and S21, etc. )
N-port parameters
Field in Field Probes
Near field Intensity Plots
Far field radiation patterns: 3-D Patterns and 2-D Cartesian and Polar Graphs
Smith Chart visualization
Frequency Response to Time Domain Signal
Export result data to MATLAB
Featured Characteristics

Integrated antenna library
Powerful model editor
Standard CAD formats processing (ACIS SAT, NASTRAN, STL, IGES, CATIA V4 and V5)
Advanced CAD and meshing functions
Point-and-click drawing and editing
Frequency domain analysis from DC up to several GHz
Comfortable pulse construction and pulse shape influence analysis features
Arbitrary complex linear circuits in MoM analysis
Dielectric material support
Matrix-Partitioning for extremely fast and accurate optimization calculations
3D and 2D post processing tools to present comfortable models and results
Parallel solvers for Linux and Windows
MATLAB link
FREE Student Version

MMANA-GAL
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. In addition to English (default), Russian (more information about
Russian MMANA available on DL2KQ's website: http:\\www.dl2kq.de) and Bulgarian, five more languages have been added with
the new release. You now have the additional choice of German (by Alex Schewelew, DL1PBD and Ulrich Weiss, DJ2YA), [more
information about German MMANA-GAL available on website: http://dl2kq.de/mmana/4-7.htm], Japanese (by Nobuyuki Oba,
JA7UDE), Spanish (by Valentin Alonso Gracia, EA4GG & Dimitri Aguero, F4DYT), Serbian (by Slobodan Ilic' YU1GV), and
Czech (by Martin Kratoska, OK1RR) user languages.

Users can easily write a file in their own language by editing the English one. This means, MMANA will be able to communicate
with an user in ANY language, actually in the language of his operation system, and that users will be able to write language
files themselves. Besides, a user is now able to edit the program's signs, messages and Help file in his own language.
Download links
4NEC2  LINK
EZNEC Link
EMCoS Antenna Vlab Link
AN-SOF Link
MMANA-GAL Link
4NEC2
 
EZNEC
AN-SOF
 
 
MMANA-GAL
 
 
EMCoS Antenna VLab