4nec2\exe” folder, in your Word or Wordpad text editor. Other recommended sources for NEC related informations are the Nec-2 and Nec-4 user-manuals and . 4NEC2 is a freeware antenna simulation software program. The program can be used to model an antenna, and then determine through. Antenna Modeling With 4NEC2. Presented to HOTARC. By Craig Weixelbaum. May 22, Basic Modeling Approach using 4Nec2. The goals of this
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After thousands of optimizer iterations, It looks pretty good. Just install manuao both. I ran hundreds of combinations of antenna designs, shapes, feed points, etc.
Types of ground and height of the wires. In all the radiation patterns calculated with NEC-2, the gain is expressed in dBi. I There are three ways to view the far field antenna pattern upon creating a model and running it.
Daily evolution of the ionosphere. Note that some of the rules are not applicable to later versions of the algorithm NEC3 and NEC-4which are more advanced and whose code is not available to the public. And, once they are translated, you can modify the card format, mxnual, turn them into variable based models for optimization.
Using just one of the tests does not ensure that the model will be adequate [Ref. However, one can model slightly elevated radial systems.
If this rule is not observed, the model probably has defects in the specifications of the 4ne2c or maybe the generator is located in the wrong place. Hats off to Arie Voors! When I first ran this program I almost put it in the too hard basket. IX The manjal to read. In the case of multiband or wideband antennasthe segment density will be different for each working frequency. In the case of the horizontal wires, it is necessary to observe a height over the ground of at least one tenth of the working wavelength [Ref.
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For each case, specifications are provided regarding whether the wires may touch ground or not and in the negative case at which height over ground must be placed. No need to manually change the variable 4enc2 times due to “hardcoding”. This is useful for computing mutual impedance for example.
This section shows other advices and rules of design not related to the previous sections: NEC-2 does not allow to model underground wires [Ref.
This enables rotating through user specified slices around degrees and pulling detailed gain data as a function of angle and azimuth angle. Some programs may impose conditions in this regard.
4NEC2 freeware antenna modeller and optimizer Product Reviews
This enables the designer to specify, say, for an OCF, both of the lengths of the segments as variables. The following terminology will be used throughout this article see fig.
4nwc2 the fast ground type, NEC-2 uses a method based on complex reflection coefficients. If two wires of different diameters join in manusl point, the results of the simulations may not be precise [Ref. The method of the moments in which NEC-2 is based on, computes the interaction between segmentss. In order to check the validity of a model, it is recommended to perform both the convergency test and the average gain test.
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If a wire is a quarter-wavelength long, 5 segments will be a good minimum [Ref. Arie Voors introduced this power into the 4NEC2 wrapper. You have to manuao View, then, select far field pattern. It is advisable for the distance between them to be at least several 4nfc2 diameters as well [Ref. Average gain test AGT. Radius of the wires. It provides graphical display of antenna currents and phase, and allows selecting segments for numerical current display in complex format.