Antenna Modeling With 4NEC2. Presented to HOTARC. By Craig Weixelbaum. May 22, Basic Modeling Approach using 4Nec2. The goals of this A Beginner’s Tutorial for 4NEC, a NEC2 Distribution. Written and Tested by Scroll down, and find “Latest 4nec2 version ()” under the “Downloads” header. Hello! Does anyone know where I can find some good tutorial/guide to get a basics of how to use 4nec2. I am total beginner. I was able to find.

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Now for some question we might hope 4NEC2 can answer. In the new window select instead “Far field pattern” then select Generate. The harder part than the tool is understanding the underlying antenna theory to know what to do to synthesize sensible designs.

For the resonant feed line antenna, the choke is located at the end of the radiating element where the local impedance is very high — voltage maximum and current approaching zero.

How much gain will this antenna give me?

Skip to content Vertical dipole with transmission line feed and choked feed line. View all posts by Gary Rondeau. CMOS Technology file 1. Distorted Sine output from Transformer 8.


It giveth me an inferiority complex.

This simple antenna system is a great sandbox for learning the tricks of the NEC codes and some of the basic principles of antenna design, and to find all the pitfalls of this nice idea. So, I’m curious what you liked or didn’t like. A command box will open temporarily to show progress of the simulation. Because the choke is so critical, I decided to model several different versions and mis-tunings to see the effects. But I tutroial offer a few pointers.

Input port and input output port declaration in top module 2. With vertical antennas, the ground model will have an enormous effect tutofial the level of losses, far field radiation pattern, and gain.

Unlike a simple choke on a feed to keep the RF out of the shack, the choke for this application has a much more difficult job to do. I’d recommend to run an example like a simple dipole on a single frequency and observe the impedance, pattern, VSWR etc.

4Nec2 Software Tutorial Needed

I know there are some tutorials now, but I could not really say which is best. Does anyone have a favorite tutorial for the software? WZ7UMar 9, Besides the antenna I tugorial modeled the feed transmission line to the transmitter.


Optimizer window shows rapid turorial on correct length L1 to minimize SWR. How can the power consumption for computing be reduced for energy harvesting?

In my opinion once you know how to launch the program, the next logical step is to run an example antenna and play around with it until you understand some of the controls of the program and how to interpret the output.

4nec2 tutorial

WZ7UMar 8, I am total beginner. Vertical antenna radiation patterns. Synthesized tuning, Part 2: Heat sinks, Part 2: If we knew the reactance of the choke we could model it with NEC.

Thank you in advance. RF current magnitude in green. To find out more, including how to control cookies, see here: Remember, toothat you do not want a design that is sensitive to small parameter variations.

If I use 75 ohm coax, how long should the transmission line be? If you want to see the pattern then you would re-run the simulation.