gyz182
Member level 2
Hi!
I designed a simple (y-oriented) half-wave dipole excited using a discrete port in CST MWS.
I had a look at the radiation pattern and it seems just fine as compared to analytical solution. It returns a directivity of 1.6 and E-plane HPBW of 78 degrees.
The issue I am having is the radiation pattern in the H-plane shows ripples in the polar plot attached. Now, the ripples are of a very small magnitude (ranging from 1.658-1.659)
and essentially, when I adjusted the plot to a more sensible scale (say 0 to 5), a nice circular radiation pattern is observed.
Why are there ripples (although of extremely small magnitude) present though? It also seems to exhibit perfect (up-down, left-right) symmetry.
I initially thought this was due to the cylinder model segments defined, but I get the same symmetry even if I increased the number of segments of cylinder model to say 30, or a smooth cylinder with zero segments.
Increasing the mesh count also does not seem to fix the "problem".
Any feedback and input is very much appreciated!
I designed a simple (y-oriented) half-wave dipole excited using a discrete port in CST MWS.
I had a look at the radiation pattern and it seems just fine as compared to analytical solution. It returns a directivity of 1.6 and E-plane HPBW of 78 degrees.
The issue I am having is the radiation pattern in the H-plane shows ripples in the polar plot attached. Now, the ripples are of a very small magnitude (ranging from 1.658-1.659)
![dipole rad pat.png dipole rad pat.png](https://www.edaboard.com/data/attachments/54/54762-70584d9d56da6d1a22cb4dc0516ec5ed.jpg)
Why are there ripples (although of extremely small magnitude) present though? It also seems to exhibit perfect (up-down, left-right) symmetry.
I initially thought this was due to the cylinder model segments defined, but I get the same symmetry even if I increased the number of segments of cylinder model to say 30, or a smooth cylinder with zero segments.
Increasing the mesh count also does not seem to fix the "problem".
Any feedback and input is very much appreciated!
Last edited: