Circular or Rectangular - what is better?

Hi,

I went through some books describing antennas. Usually circular as well as rectangular horn antennas are considered. But what I'm missing is a simple thing - in which situation one uses circular horn, and for which rectangular - one? What is the comparison between those two types of antennas?

For antenna radiation patterns and efficiencies, you can use EM-Core to simulate them.

Infor for download and antenna design can be found at

http://www.pedasoft.com/
http://www.pedasoft.com/PedaSoftEMC.pdf

Thanks,

well I guess I know other programs as well to calculate radiation patterns, but I was wondering if one could say something like this:

If you need "feature_A" but the "feature_B" is not important for you, you should use the circular horn. Otherwise, take the rectangular-one. Is it possible to give a short classification?

@yafayez -> are there any posts from you, that do not recommend the program you are probably selling?

Circular waveguide is symmetrical at all angles around its circumference. As such, it is well suited to form antennas that need things like circular polarization (equal parts of two orthogonal electric fields).

Rectangular waveguide is non-symmetrical. In fact, it is usually deliberately designed with dimensions that would only support one dominant mode, namely the TE10 mode with electric field across the middle of the shorter dimension. As such, it is naturally good for making linear polarization antennas.

Circular horns have lower side lobes.

Hi,
If you need circular polarization than circular horn is preffred over rectangular one