Ee 172 extra credit project san jose state university. I produced an optimum design for a coffee can antenna, with about 9db of gain. It also displays certain information about your antenna, including. The numerical electromagnetics code, or nec, is a popular antenna modeling system for wire and surface antennas. Some of them include closespaced wires, closespaced wires of different diameters, tapereddiameter elements, different diameter wires joined at an angle, and placing sources at a wire junction. Nec24 based antenna modeler, analyzer and optimizer. My interest in antenna modeling has always been casual, needing it when an upgrade to my antenna system was needed. What is the best software used for antenna design and simulation. Take a look at my tutorial for describing antennas for wlan deployment. Nec numerical electromagnetic code, written by gerald burke, is a popular antenna modeling code for wire and surface antennas and scatterers. Nec 2 is a public domain methodofmoments mom simulator suitable mainly for wire antennas and some planar antennas which do not rely.
Mininec pro antenna analysis software black cat systems. You can then run multiple eznec test cases while autoez automatically changes one or more. It is very useful for those designing home made antennas for their rtlsdr or other radio, or for. The nec files may be used with any of the nec 2 or nec 4 programs such as 4nec2, gnec or cocoanec, however some of them with tapered elements may only be simulated accurately by nec 4. Super numerical electromagnetic code snec software and. It is restricted to antenna elements of a single diameter although some software providers have introduced corrections for linear elements whose diameters varies. Except for the graphics elements, the tiger version of cocoanec uses multiple cores of a processor only when modeling an antenna at multiple frequencies. One of 4nec2s most useful tools is integration with voacap so users can see antenna performance under certain. The code was made publicly available for general use and has subsequently been distributed for many computer platforms from mainframes to pcs. The numerical electromagnetics code, or nec, is a popular antenna modeling system for wire. Calculation is made with use of nec 2, including calculations above a surface of the ground in sommerfeldnorton model, calculations with use nec 2 extended thin wire kernel ethwk and voltage excitations by current slope discontinuity voltage sources csdvs. The physical design of the antenna is entered such as the lengths of wires and elements. Far field pattern for different antenna heights 31.
Because in the beginning they were hard paper punchcards. Click here for an offsite explanation of various electromagnetic and antenna modeling techniques including the moment method. Wire antenna software free antenna modeling software. Nec 3, and the current nec 4 program which superseeds nec 3, allows buried wires and wires close to ground to be modeled correctly. Numerical electromagnetics code nec2 unofficial home page. Another antenna analysis software alternative to numerical electromagnetic code nec for analyzing insulated or bare thin wire antenna structures over a lossy or perfect groundplane based on the moment method. As before that punchcards needed to be produced and fed to crude computation machines. Starting eznec modeling 3 ctu, dayton, 2011 the eznec 1 software, created and marketed by roy lewallen, w7el, can be obtained from. Is there a free piece of software that will make a nec file for a simple quarter wave whip antenna. Resources listed under antenna analysis category belongs to software main collection, and. Nec 2 is sufficiently accurate for many antenna modeling purposes, but does not work for buried wires or models with wires that are close to ground. Especially designed for antenna modelers, 4nec2 is a simple tool for designing, optimizing and verifying 2d or 3d geometry structures.
Nec2 is a highly capable version of the code which is in the public domain. Recent versions of eznec contain a 3d plot graphic that can be sliced for select 2d patterns. The snow leopard version will use multiple cores for other parts of nec 2 that are compute intensive. This professional software tool is called super nec 2. W7el also makes available eznec, a segmentrestricted version of nec2, and elnec, a version of mininec 3. Yagio is similar to lpcad, it uses keyboard commands instead of a mouse menu.
Autoez works in conjunction with the eznec antenna modeling program and allows you to use variables to control diverse aspects of the model. In this tutorial i will explain what a nec antenna modelling software is. Wlan antenna simulation with nec2 will save you countless hours of cut and try in the lab. As its been 7 years since ive done so, i surveyed the available software again and found eznec 5.
The utility nec2 for mmana is intended for calculation of antenna models made and. Once this nec file has been completed and saved all you need to do is start the 4nec2 software and 3. Antenna simulationsvertical and horizontal by nec2. A second antenna is needed nec can also perform simulations in the far field and that can be used to. The nec simulation model, and sample output, can be found here. Simplified nec2 modeling for amateurs and professionals. Ive downloaded qantenna and 4nec2 to try and model my antenna and see what i can do, however neither of these programs allow you to make an antenna as far as i can tell they require you to import an nec file. Lower gain than the biquad, it also tends to radiate significant sidelobes. The embedded nec 2 engine is significantly faster than nec 4. It also includes stateoftheart 3d visualization and a drawing style structure editor. Mininec does have certain advantages when compared to either nec2 or nec 4. Best software for ham antenna simulation, time owned.
Windows versions of eznec software are under development. Input impedance for different antenna heights 29 9. How to produce a nec antenna file and what software to. Another model that you might simulate is the ubiquitous coffee can feed. Mininec pro is an antenna analysis program for windows and macintosh computers. Nec simulates the electromagnetic response of antennas and metal structures. Most design programs are specific to one particular antenna type, and only a few types have ever had dedicated programs. Antenna modeling software and other utility programs by dan maguire, ac6la autoez automated use of eznec. See the general description of eznecelnec products under nec 4 above. Nec based antenna modeler and optimizer by arie voors 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 andor compare nearfarfield radiation patterns for both the starting and experienced antenna modeler. Nec2 for mmana the utility nec2 for mmana is intended for calculation of antenna models made and optimized in program mmana and for construction and simulation of antenna models using input language nec2 and based on mmana models. The following files and links point to nec aoyo models of various ham antennas that i have simulated andor tested over the past 30 years as an antenna designer. Emistream and pistream is a registered trademark or trademark of nec informatec systems, inc. A beginners tutorial for 4nec, a nec2 distribution.
The program can be used to model an antenna, and then determine through simulation properties such as the radiation pattern and swr of the modelled antenna. Poggio wrote the necmom family of programs at lawrence. The main category is antenna analysis software that is about software, antenna analysis software, for ham radio operators and hams. The package comes with a number of example models, and there is an extensive indexed help 2 facility with information on all aspects of the program. About 4nec2 antenna modeler the resource is currently listed in in a single category. Yag files can be converted using the msdos based scale. The previous mentioned 3 antenna modelling software uses the nec 2 numerical electromagnetics code engine which does all the calculations. Antenna modelling software based on nec2, nec4, mininec kernels is a frontend to the named kernel. You need to be specific about the exact software you are referring to. In the antenna modeling activity, i use two software, mmanagal and 4nec2. Necwin pro antenna analysis software with the user in mind 4nec2 antenna modeler 4nec2 is a completely free nec2, nec4 and windows based tool for creat.
What is the best software used for antenna design and. Super nec has a builtin template for a yagi antennas which allowed us to simply input the yagi antenna s element spacings and super nec generated a three. I use mmanagal for quick and easy modeling because the interface is very intuitive, while i use 4nec2 for indepth modeling because the tool is more complete than mmanagal. To download and try the software click upmost two links below on the right. It was originally written in fortran in the 1970s by gerald burke and andrew poggio of the lawrence livermore national laboratory. In the main window choose calculate and then nec output data. You might ask why care about mininec when we have nec 2 and nec 4 available. Im not aware of any general purpose antenna design software.
Details on how to construct this antenna, both as standalone and as a parabolic dish feed can be found at this link. Change to the main menu f2, open settings and chose notepad editor. This link is listed in our web site directory since saturday aug 3 2002, and till today 4nec2 antenna modeler has been followed for a total of 29008 times. Super numerical electromagnetic code s nec software and antenna simulation firouz mohseni fard international journal of machine learning and computing, vol. Mm hamsoft includes free mininec based antenna analyzer. In it select use original file then select generate. Models can include wires buried in a homogeneous ground, insulated wires and impedance loads. Of coarse it is the same mechanism with mininec based frontends i. Best software for ham antenna simulation time owned. Antenna simulations with 4nec2 including an application. This is a free gpl electromagnetic simulation software compatable with. This window can be brought up by hitting the edit nec input file button on the main window. There is also a sample nec model that you can use to test your setup.
View antenna display, showing the wires making up the model of the fiveelement beam, with currents and 2d slice superimposed to show orientation. We could say these softwares are user interfaces that. The utility nec2 for mmana is intended for calculation of antenna models made and optimized in program mmana. Yagio runs under windows 2000, xp, vista, win 7 and likely win 8. Eznec also implements the nec2nec4 ground wave rp1. Eznec 2, the basic version of the nec 2 programs, offers 3d plots with 2 d slicing, groundwave output, stepped diameter correction, and numerous shortcuts to antenna geometry modification. Eznec pro 2 is a complete, easytouse analysis program which uses an integrated version of nec2 for calculations. Ansof simulation software for modeling wire antennas and scatterers. Simulation of wire antennas using 4nec2 a tutorial for beginners. There is a wide and varied market of applications that embed the nec2 code within frameworks to simplify or automate common tasks. There is a wide and varied market of applications that embed the nec2 code within frameworks to simplify or automate. All of these programs originated in the mainframe era, originally running on control data machines.
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