In multi-element antennas, the fields due to currents in one element induce currents in the other elements. This produced the Antenna Modeling Program, or AMP, which was extensively modified to support disk-based files, simplify the input and output to make it easier to use, and extensively documented. By using this site, you agree to the Terms of Use and Privacy Policy. This page was last edited on 21 September , at There is a wide and varied market of applications that embed the NEC-2 code within frameworks to simplify or automate common tasks. Electromagnetic simulation software Free simulation software. NEC sums all of these to determine the net current in each of the conductors. 
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Numerical Electromagnetics Code - Wikipedia
The tool is able to calculate the feedpoint impedance for a given frequency, along with theoretical efficiency, as well as generate and print plots of radiation patterns.
The calculations normally converge rapidly. It can be used for, but is not well suited to, slotted waveguide antennasfractal antennas or similar designs in which the component conductive elements are not rod-like.
The output is then sampled at a user-defined point, the load.
Numerical Electromagnetics Code
The code was made publicly available for general use and has subsequently been distributed for many computer platforms from mainframes to PCs. Because the reradiated signal is normally small compared to the original signal, it only produces a small change, or perturbationin the resulting element currents.
The EX excitation line indicates rpo location of the energy supplied to oro design, in this case an incoming plane wave being captured on segment 10, while the RP radiation pattern sets up some specifics of the signal. Each element is longer than the last, and to maintain accuracy, the later elements are divided into more segments.
In this case, the plane is considered as a unit and the magnetic contribution is calculated directly and fed back into the calculation once the contributions from the individual wires are considered. NEC-2 added two major features to the original NEC, a numerical Green's function for working with large planes, and an expansion of the ground-plane code to deal with partially lossy materials that are more realistic for antennas near the ground.
BRACT was a pure method of moments implementation, suitable for use on antennas consisting of uniform diameter conductors arranged in free space and connected to each other at their ends if at all. The NS parameter defines the number of segments the wire should be divided into during the calculation; using more segments breaks the wire into smaller parts and may produce more accurate results mininef the cost of increased calculation time.
These can be seen on most log-periodic designs in the form of two thin rods running down the boom between the main antenna elements, although some designs use the boom itself, or hide the wires within the boom. Text data can be exported to plain text file format.
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The GUI makes use of a multi-tabbed environment for helping you access the main features of the program. The GE line indicates the end of the geometry section.
It uses the same method of moments algorithm to calculate the outcomes, but using entirely original code. At this point, NEC scans the geometry for overlapping endpoints, which it then connects together to make a single longer conductor. Electromagnetic simulation software Free mininfc software.
Modern versions run on a wide variety of platforms. Click to load comments. NEC-4 minibec what was already widely the case, taking input from a specified file, sending output to another file, and allowing comments to be added to any line using the! NEC-2 is the highest version of the code within the public domain without a license.
If this is set to zero, then the next line must be a GC line that includes additional information to define tapering rods. It cannot model buried radials or ground stakes. This indicates that this antenna is fairly directional, and one would expect it to have a high minnec ratio.
Finally, it begins to list calculated values, in tabular format. In other projects Wikimedia Commons. A new model for a voltage source was added and mininecc other modifications made for increased accuracy.
Antenna Modeling
Lawrence Livermore National Laboratory. NEC is widely used for modeling antenna designs, particularly for common designs like television and mininc antennas, shortwave and ham radioand similar examples.
A common example is to run the entire calculation suite for different input frequencies, and then plot samples on a single chart. The method of moments algorithm has jininec limitations as well; the number of calculations required to model a three-dimensional structure of N radiating elements is roughly proportional to the cube of N.
All of these programs originated in the mainframe era, originally running on Control Data machines. Finally the EN line end of input indicates the deck is complete, at which point the NEC code starts the simulation and generates reports.
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