- Download Numerical Electromagnetic Code Free Online
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- Numerical Electromagnetic Code
- Numerical Electromagnetic Code
Numerical Electromagnetic Code – NEC–4 Method of Moments. Part II: Program Description – Theory. Burke January 1992 A. Medium is free space and the lower medium has a complex relative permittivit y of 16. The code manual documents a detailed explanation of the Numerical Electromagnetic code - Reflector Antenna Code by which the near field and far field of a typical Navy reflector antenna can be calculated. One important feature of the code is the capability for a general reflector rim shape.
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YGO2is a FREEWARE progarm. It may be freely copied anddistributed, but ONLY as long as there is no cost to therecipient.
Unlikethe original release of YGO, this version allows theuser to optimize the array at up to 15 different frequencies, and tospecifya different driven element (if desired) at each frequency. UnexcitedDEsare assumed to be terminated in the feed system characteristic imped-ance.
YGO2(YAGI GENETIC OPTIMIZER II) designs optimized Yagiantennas using one of the most recent and powerful techniques inapplied electro- magnetics: a genetic algorithm. A genetic algorithmmimics natural sel- ection ('survival of the fittest') by creatinggenerations of Yagi designs in which the best designs ('individuals')pass their design parameters ('genes') onto the next generation in sucha way that better and better antennas are the result. GA optimizers canproduce remarkable results not achievable with any other designtechnique. Genetic algorithms are superior to deterministic optimzers,and they are easily implemented on a PC.
YGO2is user-friendly and easy to run. All GA parameters arechanged by editing a single set-up file. The user can specify popu-lation size,number of generations, antenna figure-of-merit, and all otherparametersneeded by the GA. The Yagi's performance is computed using NEC-2D, thestate-of-the-art Numerical Electromagnetics Code (double precision)developed at Lawrence Livermore National Laboratory.
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WhenYGO2 has completed its optimization, the radiationpattern ofthe best antenna is plotted on screen. A separate plotting utilityallows the user to view radiation patterns for other top designs on ageneration- by-generation basis. One of the GA's most attractivefeatures is that, instead of producing only one 'best' design, itproduces groups of designs thatachieve similar performance. The designer can then select from thesegroupsthe Yagi that best meets the requirements.
Toinstall YGO2, copy the file INSTYGO2.EXE into the directoryon your hard drive that you will use for YGO2. YGO2 files are createdby executing INSTYGO2.EXE, which is a self-extracting EXE file.If you have a previous version of YGO2, simply overwrite all files ofthe same name.
Besure to check the README.TXT and YAGI_GA.TXT files forinform- ation on setting up a YGO2 run. The fileNEC2INFO.TXTcontainsinformation on creating various size NEC-2D executables. Any changes toYGO2 will be described in the file UPDATE.TXT. Please read UPDATE.TXTif it is present.
Numerical Electromagnetic Code
YGO2is a DOS program that must be run under MS or PC DOS(ver.3.3 or higher), Compaq DOS (ver.3.31 or higher), or in a DOSwindow under MS Windows 3.0 or higher. YGO2 also requires an 80386/87math coprocessor or higher CPU and about 1 MB of RAM (depending on themodel size).
Contributedby PhadeanEngineering <[email protected]> POBox 611, Shrewsbury, MA 01545-8611 USA, tel. (508) >869-6077, fax(508) 869-2185)
Numerical Electromagnetic Code
The code manual documents a detailed explanation of the Numerical Electromagnetic code - Reflector Antenna Code by which the near field and far field of a typical Navy reflector antenna can be calculated. One important feature of the code is the capability for a general reflector rim shape. Another important feature is the capability to input a practically arbitrary volumetric feed pattern. Only the class of parabolic surfaces was implemented in the computer code. The theoretical approach for computing the fields of the general reflector is based on a combination of the Geometrical Theory of Diffraction (GTD) and Aperture Integration (AI) techniques. Typically, AI is used to compute the main beam and near sidelobes; GTD is used to compute the wide-angle sidelobes and the backlobes. The theoretical background on which the computer algorithms are based is described along with descriptions of the main program and the various subroutines. For each subsection of the main program and subroutine, the purpose and method are included, accompanied by a flow diagram, a key variable list and a listing of the code. (Author)