It also includes stateoftheart 3d visualization and a drawing style structure editor. Much of my antenna research work is based on systematic antenna modeling in a version of the numerical electromagnetics code nec. With a sample version and a full paid version of the book, the reader will start from downloading and installing 4nec2, learning the 4nec2 user interface, build a 20m dipole and analyze it at various heights above real ground then view the different antenna patterns. Most nec software will test the geometry and segmentation of the nec wire model before running the nec. The following brief notes will provide links to known antenna modeling software providers. Nec expands broadband availability in sweden with the ipasolink exadvanced radio. The proven and unique processes for collaboration, fair dealing and good project management that are inherent in the nec philosophy remain in this evolved edition. Since i was measuring it with my rigexpert aa600 analyzer on ham frequencies anyway, it occurred to me that it would be informative to measure the impedance of this antenna near the frequency where it is onehalfwavelength long, or approximately 6. View antenna display, showing the wires making up the model of the. The numerical electromagnetics code, or nec, is a popular antenna modeling system for wire. Multinec can then calculate the results for a given scenario or can run multiple test cases while automatically changing the model between runs.
The nec contracts have been updated and streamlined following feedback from the industry, considering. Yag files can be converted using the msdos based scale. As before that punchcards needed to be produced and fed to crude computation machines. Antenna modelling software based on nec2, nec4, mininec kernels is a frontend to the named kernel. This makes the total electrical length of the antenna 73. Normally, nec models assume propogation along the z axis. Nec2 is a highly capable version of the code which is in the public domain. The nec files may be used with any of the nec2 or nec4 programs such as 4nec2, gnec or cocoanec, however some of them with tapered elements may only be simulated accurately by nec4 or other mininecbased software. If it is not visible just press f3, or if the window is visible and the geometry was not updated just select viewreset on the geometry window. Take full control of your nec display solution with our specialized control, calibration, and adjustment software. Antenna modeling files american radio relay league. Because in the beginning they were hard paper punchcards. Nec2 is written for input data files organized as card decks. It is the easiest way that i found to obtain both azimuth and elevation plots.
Super nec has a builtin template for a yagi antennas which allowed us to simply input the yagi antennas element spacings and super nec generated a three. Our display driver quick find will help you quickly identify and download the right driver for your nec or mitsubishi monitor. Nec24 based antenna modeler, analyzer and optimizer. Nec tutorial 1 download the folder 4nec2 from the class website. The physical design of the antenna is entered such as the lengths of wires and elements. There is also a sample nec model that you can use to test your setup. Models can include wires buried in a homogeneous ground, insulated wires and impedance loads. Details on how to construct this antenna, both as standalone and as a parabolic dish feed can be found at this link.
The code is based on the method of moments solution of the electric field integral equation for thin wires. It is used to design jpole antennas for the desired frequency. Take a look at my tutorial for describing antennas for wlan deployment. W7el also makes available eznec, a segmentrestricted version of nec2, and elnec, a version of mininec 3. 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. Nec numerical electromagnetic code, written by gerald burke, is a popular antenna modeling code for wire and surface antennas and scatterers. Ee 172 extra credit project san jose state university. About necwin pro the resource is currently listed in in a single category. Jpole antenna is pretty easy to build and usually designed by amateur radio operators through this software, you can easily find out four important parameters to build this antenna namely, radiator length, driven stud length, gap space, and feedpoint. Since my eznec 4 antenna software uses the nec2 engine i decided to build one of his designs that modeled well on my software.
How to produce a nec antenna file and what software to. Nec3, and the current nec4 program which superseeds nec3, allows buried wires and wires close to ground to be modeled correctly. Nec successfully demonstrates realtime digital oam mode multiplexing transmission in the 80ghzband for the first time nov. Create models of geometrical structures in the integrated environment for antenna designing.
To be used with either nec4 or yagi optimizer modeling programs. Nec4 calculates values of resistance for ground stakes that agree exactly with dave gibsons simple equation, but only when the antenna wire connecting the stakes is above ground. You will get used to using the gm card to rotate your models around the axes. This selfstudy volume encompasses virtually the entire command sets for both cores, including details of command revisions in the transition between nec2 and nec4. Nec visualization, optimization and sweeping tool the 4nec2 tool is a windows and nec2 or nec4 based tool for both the starting and experienced antenna modeler that can be used to create, view and check your antenna geometry structure and generate, display and compare near. Although communication with nec4 is largely by means of necformat files, these are not generally available except after exiting eznec pro. When i became interested in wire antennas for voice communications at higher frequencies a couple of years ago, i looked for some suitable modeling software. Nec was developed by the lawrence livermore national laboratory in the 1970s and is an antenna modelling system for wire and surface antennas. The nec group globally provides solutions for society that promote the safety, security, efficiency and equality of society. In both eznec pro programs, the antenna description is entered using the popular eznec interface method of spreadsheetlike entry and powerful editing tools, or eznec pro can directly read your existing nec description file. Nec4 the latest version of nec is nec4, which overcomes most of the shortcomings with earlier codes. The application is free and it can be downloaded from the download page which can also be accessed by using the download tab button at the top of this page. The most popular versions among the software users are 5. In january, 1998, the arrl board of directors changed the arrl advertisementacceptance policy to permit the advertising of antenna gain figures for antennas whose performance can be accurately modeled using either nec4 or yagi optimizer modeling programs.
What is the best software used for antenna design and. Nec4 modified nec3 to better model very small antennas, like those on cell phones and wifi routers. Eznec pro uses its own easytouse antenna description file system which has been proven by a large number of eznec and eznec pro users, although it is able to both read to a limited extent and write necformat files. The main category is antenna analysis software that is about software,antenna analysis software, for ham radio operators and hams. Eznec was developed to work on windows xp, windows vista, windows 7, windows 8 or windows 10 and is compatible with 32bit systems. Of coarse it is the same mechanism with mininec based frontends i. Antenna analysis program for windows and macintosh computers. The nec4 suite of contracts builds upon the success of the nec3 contracts. Jpole is a free and portable antenna design software for windows. Especially designed for antenna modelers, 4nec2 is a simple tool for designing, optimizing and verifying 2d or 3d geometry structures.
The yagi has a 159 boom and breaks down into pieces no longer than 66 for portability. This professional software tool is called super nec 2. Nec numerical electric code is a simulation method for wire antennas, developed by the lawrence livermore laboratory in 1981 or the navy. It is restricted to antenna elements of a single diameter although some software providers have introduced corrections for linear elements whose diameters varies. Nec2 is not suitable if your antenna structure requires dielectric materials, for example if you are going to design patch antennas, vivaldi antenna or other you can use feko, or cst, feko is. Intel cpu is required on xp and vista systems but not on windows 7 and later.
Yes, but just as that low current is transformed by the 14 wl of antenna wire to the current maxima point, it will be transformed to another common mode current maxima on the feed line. Nec2 is sufficiently accurate for many antenna modeling purposes, but. The program can be used to model an antenna, and then determine through. Other recommended sources for nec related informations are the nec2 and nec4 usermanuals and. Spirit telecom selects necs 10gbps radio solution nov. Portrayed below is a complete and selfcontained nec model of one popular form of the endfed halfwave dipole antenna. Applying a feed to any antenna in nec or any electromagnetic simulation software is about a simple a task as can be conceived by placing a source of near infinitesimal size inline with a dipole element. An nec4 license must be purchased from the nec4 holder before purchasing eznec pro 4. Nec releases nec multiband radio solution white paper dec. We could say these softwares are user interfaces that. Can be interfaced to hfwin32 propagation prediction software. Most programs using nec include features that run batches of nec calculations to produce a composite output. Numerical electromagnetics code nec2 unofficial home page.
Mininec pro is an antenna analysis program for windows and macintosh computers. Nec4 further allows electrically small antennas to be modeled with better accuracy. This link is listed in our web site directory since sunday dec 20 1998, and till today necwin pro has been followed for a total of 315 times. File open 4nec2 inoutputfile 4 step 3 takes you to a folder where there are many in built design. Nec aims to help solve a wide range of challenging issues and to create new social value for the changing world of tomorrow. Nec display software download lcd installer, drivers. For more advanced users of nec2 and nec4, nsi is releasing intermediate antenna modeling. This means that it is possible to accurately model the input impedance of grounded or ungrounded antennas on or above the earths surface and predict the fields. View antenna display, showing the wires making up the model of the fiveelement beam, with currents and 2d slice superimposed to show orientation. To do this, advertisers submit their antenna models for verification by the arrl laboratory staff.
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