Let’s take a look at the takeoff angle for the Inverted L. I posted the 3D pattern

You can see some of what’s going on, but the takeoff angle seems to be pretty broad. HOWEVER we’re not done with this yet. The model is far from complete, so we’re not ready to rely on the output. Right now, consider what we’re seeing a qualitative and not quantitative representation of our antenna’s performance. Are we getting the general pattern right? Once we get the actual model correct, the numbers will mean something, but again not very much. They’ll be pretty good, but unaccounted for effects might also mean that the numbers aren’t accurate.

With all of our updates, we can now rerun the model ( which remember is still incomplete) and get this for the maximum azimuthal pattern:

As you can see, it shows the main lobe centered on 20 degrees of elevation. That’s consistent with my own experience for vertical radiators like this, so I’m sure it’s somewhere close to the actual take off angle.

Next, let’s take a look at what happens when we add a radial system to this model.

Categories: Antenna Modeling