Eznec Antenna Design Software Free Download ##VERIFIED##
Galina Schoultz
I believe that what you want is the effect of mutual coupling of the antennas. That, I believe, can be done in EZNEC by modeling both antennas at the same time (for example the transmitting antenna in the normal way and the receive antenna as a parasitic element not connected to anything).
In Hexbeam Modelling (Part1) we discussed the principles behind building a reliableHexbeam simulation model. Of course the acid test of a simulation model is whetheror not the results it predicts turn out to be true in practice. Between August2006 and February 2007 I built three Hexbeams - two 4 band designs (20/17/15/10)and one experimental 10m monobander. At that time I didn't have the facilities tomeasure accurately the forward Gain and F/B of these antennas; but I was able tocarry out numerous impedance measurements using an MFJ259B and a Palstar ZM-30antenna analyser, and to compare the measurements with EZNEC predictions.
However, more recent practical work on my Broadband design has highlighted the significant affect that the small connector blocks (used for fixing the wires to the end-spacing cords) can have. The capacity they add at the ends of the wires appreciably changes the tuning of the Driver and Reflector elements - by an amount consistent with the 1.3 inch "EZNEC error". I now include this block in my models and get excellent agreement between predicted and observed tuning.
Recent practical work on the Broadband design provided another opportunity to compared modelled results with the figures measured in practice. You can download the EZNEC model of the 5 band beam which I used, here. Take a look of the impressive accuracy with which EZNEC predicts the F/B and SWR performance of a 5 band Broadband Hexbeam on 20m:
About EZNEC simulation filesThe resource is currently on dxzone.com in just one category. Main category is Basic antenna theory that is about Antenna theory, basics,design antenna.This link has been on our site since Monday Dec 13 2010, and "EZNEC simulation files" has been clicked on 855 times. So far it received 4 votes for a total score of 7.00/10
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Extremely useful utility program for the experimenter becausecapacitors suitable for the high voltages present in antenna systems andantenna tuners are hard to find ... and very expensive when you do findany! :-(
You will admit that the demo version of EZNEC is verypowerful, as is! On top of being educational, the software will enableyou to analyze and design most of the common types of antennas thatamateur radio operators use.
I strongly recommend that you read Chapter Four of the ARRL Antenna Handbook. The chapter is dedicated to "Antenna Modeling & System Planning". It will help you understand antenna modeling and evaluate the antenna software available.
I like using MAC computers because of the inherent stability of the underlying UNIX operating system, and the immunity to most viruses. One disadvantage, however, is that not all types of programs are written for the MAC. I occasionally have need for an antenna modeling program. On my windows PC, I used EZNEC ( ) which costs about $100.
I use cocoaNEC 2.0 and it works great with a punctual excitation point like dipoles based design.
But I cannot succeed in modeling a J pole.
I think the issue in defining the excitation element.
Any idea?
A friend of mine is preparing for the upcoming Virginia QSO Party in March 2009. Part of the preparations include a focus on some good VHF antennas to support the heavy use of VHF mobile operations in this party. Vertical polarization is key to success. He spoke of a 5/4 Wave Antenna.
The author provides superb details on how to construct the 5/4 wavelength VHF antenna. He wisely predicted the installation into PVC would change the speed of light of conductors within. He revealed the need for a matching network. Good so far. In fact, I bet this antenna design provides a good match to 50 ohm coaxial cable, is of sound construction and will last many years in the elements.
The 5/4 wave antenna discussed is really a full-wave antenna with a 1/4 wave feed. The lack of an additional half-wave delay element between the two high current portions of the antenna suggest the author has missed an important detail in antenna design which will render the antenna far less useful than anticipated.
Finally your assertion high radiation angles make for good repeater use is counter to the trigonometric realities you are either very close to the repeater and don't need much gain at any angle or well away (often just a couple miles or more) and need gain with low radiation angles. A high gain, high angle antenna has little use in typical repeater service.
Wouldn't just a 1/4 wave have the same gain at that angle of radiation and be much simpler to build and maintain? When you put them both on EZNEC the 1/4 wave seems to be similar enough to the 5/4 wave at both low and high angles not to warrant the effort. Now if you put a 3/4 wave antenna, no phasing, up you seem to get the best of both worlds. EZNEC shows that you get a very good low angle of radiation with high gain similar to a 5/8 wave and also a high angle of radiation similar to the 5/4 wave. No extra parts and much simpler to build and maintain. Kind of like a cheep dual band 2m/70cm antenna design. Something to think about when the wind blows and the neighbors complain.
The purpose of Antenna Coursework is to provide students with a comprehensive understanding of antennas, their design, and their applications. It covers various topics such as antenna types, radiation patterns, antenna arrays, impedance matching, and antenna measurements.
Matlab is a powerful software tool used in Antenna Coursework for designing, analyzing, and simulating antenna systems. It allows students to model and visualize antenna behavior, calculate antenna parameters, and optimize antenna designs.
Some common projects in Antenna Coursework using Matlab include designing and simulating different types of antennas, optimizing antenna parameters for specific applications, and analyzing the performance of antenna arrays. Students may also use Matlab for antenna measurements and data analysis.
No, prior programming experience is not necessary to use Matlab in Antenna Coursework. Matlab has a user-friendly interface and provides built-in functions and tools for antenna design and analysis. However, basic knowledge of programming concepts and syntax can be helpful in utilizing Matlab to its full potential.
Antenna Coursework and Matlab can benefit your research or career in several ways. It can provide you with a strong foundation in antenna design and analysis, which is essential for various industries such as telecommunications, aerospace, and defense. Additionally, knowledge of Matlab can enhance your problem-solving skills and make you a valuable asset in the job market.
The Nashua Area Radio Society has been using a 3-element 40m wire beam antenna for Field Day for the last several years. The antenna uses three guyed 50 ft. fiberglass masts from Max-Gain Systems. The antenna uses three inverted-V style elements separated by a little over 50 ft. Since we are in the northeastern United States, we can point the antenna on a fixed, 260 heading and it covers the entire U.S. well.
Our 40m V-Beam antenna was initially designed using EZNEC 5.0. It was manually optimized for decent gain and front to back performance and it worked quite well. Recently, we decided to try automatic optimization software on the antenna as part of a tune-up on the design for Field Day 2018. After looking around on the Internet a bit, we discovered a software package called AutoEZ which looked ideal the my project. You can read more about the optimization project and see the results via the link below.
Our Field Day Wire Antenna information package has been updated to reflect the results of the optimization work. We have also added additional information to make the setup and tuning of our wire antenna including the 40m V-Beam easier. You can see the information package here.
So far I have been trying out antenna designs built and tested by radio amateurs world wide. I have been hearing of antenna modeling software while reading about most of the designs, but never ventured to have a look at one. As ARRL puts it, antenna modeling was the domain of scientists and engineers with expensive antenna ranges covering acres of land, along with expensive equipment. But now with ubiquitous availability of personal computers and antenna modeling software, it has become a popular amateur radio activity. Antenna modeling gives you advance information even before you start building your antenna, like feed point impedance, SWR and radiation pattern in three dimensions. Having experienced tough time tuning three of my VHF/UHF antennas in the past few months, I thought of looking at antenna modeling software before beginning to assemble my new VHF/UHF dual band single feedpoint antenna by DK7ZB design.
This is the intial screenshot which comes up when you open EZNEC software from your desktop. As I was new to the software, I started off with the Help menu at the top right corner. I read through the Help file till I reached the Test Drive Introduction and then the Along The Straightaway page. That is the page where an initial test drive of a 20 m dipole antenna is described.
Clicking on Open menu takes you to the directory in which sample antenna files are stored in your computer, within the EZNEC directory. For a test run of the 20 m dipole antenna, the file named Dipole 1 can be opened and the instructions in the help followed.
I wanted to try out the VHF section of the planned dual band single feeder Yagi, to simplify the learning process. I changed the name of the antenna from Dipole in free space to Four Element VHF Yagi by clicking on the antenna name and typing in the dialogue box and clicked OK.
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