Discussion in 'Antennas, Feedlines, Towers & Rotors' started by EA1DDO, Dec 2, 2019.

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  1. EA1DDO

    EA1DDO Ham Member QRZ Page

    I use to run a NEC2 software, 4NEC2, to create and optimize our antennas, Yagi, Quad, etc.
    Recently I´ve got a copy of FEKO, the professional electromagnetic software.
    I have spent some minutes on it, to see the demo and some example antennas, nothing else so far.

    My question is if that kind of software can replace NEC2 for usual design and optimization?

    I am asking because the first impression I had is that FEKO is more focused on electromagnetic test of an already optimized design, more than optimize a design from scratch.
    Am I wrong?

    Any advice is welcome.


    73, Maximo - EA1DDO
  2. W1VT

    W1VT Ham Member QRZ Page

    Typically you want to use the fastest software you can for optimization, as long as the accuracy is "good enough."

    I've not use FEKO, but my understanding is that it is too slow.

    Instead of optimization, computers may be getting powerful enough for brute force problem solving. Given, say, a 1mm element accuracy, run all possible models and report the "best one."
  3. K6CLS

    K6CLS Ham Member QRZ Page

    I've used FEKO. It's cumbersome, expensive, and too slow. 4NEC2 is good enough for my little projects. I'm using NEC 2, haven't found the need for NEC4...
  4. SM0AOM

    SM0AOM Ham Member QRZ Page

    FEKO is extremely powerful, but has a quite steep learning curve.

    At my employer, FEKO is used for most electromagnetic simulations,
    including transient cases as well as magnetostatic and electrostatic modelling.

    For "everyday" antenna modelling, 4NEC2, especially with use of the NEC4 computional engine,
    is perfectly adequate.

    KX4O likes this.
  5. EA1DDO

    EA1DDO Ham Member QRZ Page

    I understand are different products, for different targets, etc.
    But my question is more if FEKO can do same tasks as 4NEC2?
    For example, Can FEKO optimize (Evolve, Sweep, etc)? Gain/SWR plots? re-scale to a different wavelenght? etc...

  6. SM0AOM

    SM0AOM Ham Member QRZ Page

    Your have to either find library functions that do such tasks or write scripts yourself.

  7. K7TRF

    K7TRF Premium Subscriber QRZ Page

    For design and optimization I'd suggest EZNEC Pro (running either the NEC2 or NEC4 engine depending on your needs) along with Dan's (@AC6LA) AutoEZ Excel application which makes it easy to iterate through multiple variables during optimization.
    KF6A and N0TZU like this.
  8. EA1DDO

    EA1DDO Ham Member QRZ Page

    I see.
    It is able to do many things, but not as it comes.

    Because I´ve got it installed already, I will spend some time to learn and try. Just for fun, or future needs, who knows...
    I´ve got CST Suite as well. Not installed yet.

    Thank you Karl-Arne.
    KA0HCP likes this.
  9. EA1DDO

    EA1DDO Ham Member QRZ Page

    I use Eznec from years ago. But for optimization purposes... 4NEC2 is far better than Eznec. For plots as well.
    4NEC2 has at least three optimization modes; Evolve, Sweep and Optimization, where you can adjust most variables, from element size or diameter, up to frequency or height. And everything for free.
    Eznec can´t, and AutoEZ is not free.
    What I like from Eznec is to create the geometry and stacks, very easy.

    73, Maximo
    KX4O likes this.
  10. K7TRF

    K7TRF Premium Subscriber QRZ Page

    Correct, that's why I recommend Dan's AutoEZ add on that supports parameter sweeps and additional plotting capabilities. I'm not a 4NEC2 user so I can't compare the capabilities but AutoEZ definitely improves the optimization power of EZNEC.

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