Re: [amsat-bb] Patch antenna behavior questions (kinda long)

[Kohjin Yamada <jr1ede@xxxxxxxxxxxxxxx>]

Hello Tim,

Great job on your work for patch antenna design and your web site!

I can't follow the Ansoft Ensemble SV nor 6 at the moment due to preparation
for a dish project of 3cm EME, I'm sure would like to share these technology
some time in future. (maybe I will be too late)

I used to use Ansoft Ensemble for months and Serenade for years (both are
really great softwares!) but still need more learn.
I was curious why nobody gave any comment about the software.

I also took my full time of weeks gathering references of multi-band
patch antenna design and simulation but couldn't find out the one
better than Freddy ON6UG's.
There were some for dual band but not for triple or more.
I hope Freddy will introduce the L/S version real soon.

Just want to let you know I'm at here.
Sorry that I can't help you answering the questions.

Keep going...73

Kohjin - JR1EDE

At 07:33 01/11/19 -0500, you wrote:
>I have been working on a patch antenna for 2400 MHz.  I have one simulated
>using Ansoft Ensemble SV and I'm pretty sure I have a winner, but I am
>unsure of a few things.  I figure some of you antenna gurus can help me out.
>
>1. To obtain circular polarization, I've been told that an Axial Ratio as
>close to 1 as possible is most desirable.  My latest design achieves this.
>When I plot the Near E-Field, and animate it through a phase offset of
>0-360根 it sure looks like LHCP to me.  My question is, what is the desired
>Near H-Field behavior?  I have also plotted this parameter and I'm not sure
>what I am supposed to get.
>
>2. I've also plotted the Current vectors through a phase offset of 0-360豪
> >and it too looks like LHCP to me.  This sounds right to me but confirmation
>from someone who knows would be appreciated.
>
>3. The program plots what they call a Scattering Matrix.  I was told this
>has to do with the S-parameters.  However, I don't see a way to separate out
>S11, S12, etc.  What I get is a plot of Scattering Matrix magnitude in dB,
>which shows that at the design frequency of 2.4 GHz, the plot lies
>around -10.5 dB.  Is this good or bad?  I do have a choice to plot
>magnitude, phase, real and imaginary parameters.  Does this correspond to
>S11, S12, S21, S22?
>
>4. There is a lot of reference to Phi and Theta.  What do these correspond
>to?  I plotted the Magnitude of the Real E-Field (V) vs. Theta in polar
>coordinates and it looks to me like a beamwidth plot (which is what I'm
>after).  I don't think that is what it is however.
>
>I know, so many questions....  any help would be appreciated.  Anybody know
>of some good reference materials that you don't have to have a Ph.D. to
>understand?
>
>If you need to see some pictures of the plots I'm talking about, jump on
>over to my website at:
>http://home.adelphia.net/~tzibrat/2400mhzpatch/patch1.html
>
>It seems to change everyday!
>
>Thanks in advance!!!
>
>Regards,
>K3TZ
>
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