Hi all

I'm doing some post-grad work involving antenna arrays.

I would like to compare my simplistic model (perfectly isotropic
ominidirectional dipoles with zero mutual coupling) to a model that
includes coupling effects. This is not the major focus of my thesis,
but it's something I need to do, anyway.

I would basically like to get a handle on what kinds of phase
differences (in degrees) exist between the two models, for certain
frequencies and geometries.

I believe EZNEC may be capable of this (I have the demo)? Any other
recommendations?

If anyone would be kind enough to walk me through an outline of what
I'd need to do in EZNEC, I'd appreciate the help! (I am pretty new to
finite-element EM modelling)

Thanks for any and all replies!

Ryan

On 11 Oct 2006 03:55:01 -0700, wrote:

I believe EZNEC may be capable of this (I have the demo)? Any other
recommendations?

Hi Ryan,

It certainly is enough, given your stated goal.

If anyone would be kind enough to walk me through an outline of what
I'd need to do in EZNEC, I'd appreciate the help! (I am pretty new to
finite-element EM modelling)

Open the file 4SQTL.EZ and select "View Ant," Once you appreciate
what you've got, select the button "FF Plot" to observe the
directionality. Select the button "Src Data" to observe the drive
point impedances. Select the button "" next to the label "Sources"
to see their placement and phase.

If your designing becomes more elaborate and goes beyond the demo 20
segment limitation (not a problem with the file suggested here), you
may want to buy the package.

73's
Richard Clark, KB7QHC

On Wed, 11 Oct 2006 09:41:21 -0700, Richard Clark
wrote:

Select the button "" next to the label "Sources"
to see their placement and phase.

Hi Ryan,

Right advice, wrong file. In addition to the advice previously
offered, open file 4SQUARE.EZ and repeat instructions. The two files
lead to the same outcome for the same reason. The difference is this
file reveals how to do it with 4 sources.

This, by the way, gives you all the characteristics you asked for such
as mutual coupling. So does the first file, but this one is probably
more illustrative for revealing the drive point Zs and how that mutual
coupling affects them.

Move the single elements around and observe the full effects and
outcomes.

73's
Richard Clark, KB7QHC