Dear all,


Mrs. yin,SV7DMC and Mr. pez,SV7BAX of TheDAG are strongly suggested
your newsgroup, to ask for support, help, comments or opinions about
antennas matters. A few days ago I made a post: "Naming an Antenna...".
Fortunatelly, there were many replies and therefore I want to thank all
of you for your time. In this post, I attach the following links in
order to show you the geometry and the standing wave analysis of the
prototype (?) antenna I want to examine theoritically and propably
construct later.

geometry: (the antenna lies at the yoz
plane)http://antennas.ee.duth.gr/recradioa...hli/04/geo.jpg
standing wave analysis:
http://antennas.ee.duth.gr/recradioa...0analysis2.gif

Thanks to the suggestion of Mr Reg Edwards I decided to name this
antenna D-Dimond1 (ok, I changed the name he suggested a little bit).
I would appreciate to look forward from you for any comments about the
geometry or the name of this antenna. Also, once again; is this
geometry or the name prototype?

Thank you in advance for your time


Dimitris

In article . com,
says...
http://antennas.ee.duth.gr/recradioa...0analysis2.gif

takes up a lot of real estate, but an interesting idea. Has
anyone tried to model this thing for a polar pattern ??

Dear Mr. Mutch:

Can not be modeled yet because at least one detail has not been
specified.
73 Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
Home:
"William Mutch" wrote in message
ell.edu...
In article . com,
says...

http://antennas.ee.duth.gr/recradioa...07/standing%20
wave%20analysis2.gif

takes up a lot of real estate, but an interesting idea. Has
anyone tried to model this thing for a polar pattern ??

If that isn't a three wavelength center fed loop of uncommon design, or a
three wavelength folded/shorted dipole and center fed--of uncommon design, I
need a three day observation!

Regards,
John

Dear Dimitris or "superas_1988"

See earlier message below. Names are good, but the antenna is not
completely specified.


Dear "superas-1988" (presumably in Greece)
It appears from the drawing that the antenna is a wire antenna with all
wires in the Y-Z plane. It is likely that the portion above the driven
dipole is a mirror image of the portion below the driven dipole. Each
dipole has the same length and that length is specified as 0.5 WL.
Questions:
1. Is the above true?
2. What is the included angle between the driven dipole and the dipole to
its right and above? It looks as if that angle is near 55 degrees.
3. Is the length of each dipole a physical 0.5 WL or an electrical 0.5
WL?
4. What is the nature of your interest? A school project? A radio
amateur's project?
5. Is the antenna intended to be used at HF? If so, how high do you
consider the driven element to be above the earth's surface?

Regards, Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
Home:





http://antennas.ee.duth.gr/recradioa...07/geo%2Bcomme
nts.gif


"Dimitris" wrote in message
ups.com...
Dear all,



geometry: (the antenna lies at the yoz

plane)http://antennas.ee.duth.gr/recradioa...5/hli/04/geo.j
pg
standing wave analysis:

http://antennas.ee.duth.gr/recradioa...07/standing%20
wave%20analysis2.gif

Thanks to the suggestion of Mr Reg Edwards I decided to name this
antenna D-Dimond1 (ok, I changed the name he suggested a little bit).
I would appreciate to look forward from you for any comments about the
geometry or the name of this antenna. Also, once again; is this
geometry or the name prototype?

Thank you in advance for your time


Dimitris

First of all, I want to apologize about my late response. I would like
to try answering your questions:
1. All the above you' ve mentioned are true.
2. Actually is 60 degrees.
3. Electrical 0.5 WL.
4. This will be a university postgraduate theses.
5. The antenna is intended to be used at 1111MHz. However I dont' know
how high the driven element will be above the earth's surface.

With regards
Dimitris

Dear Dimitris:
Thank you for the information.
I constructed a model of the antenna with 60 degrees and 0.5 WL
electrical lengths. Please see my message called "Greek Double Rhombus" of
May 3, 2005.

Because the intended frequency is very high, disregard the comments in
my message about performance above ground. Your use is almost certain to be
many WL above ground and thus the FS pattern will be close to the pattern
attained.

The high input impedance at resonance might facilitate the use of
arrays.

Good luck with your project. Let the group know how it ends.
Regards, Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
Home:
"Dimitris" wrote in message
ups.com...
First of all, I want to apologize about my late response. I would like
to try answering your questions:
1. All the above you' ve mentioned are true.
2. Actually is 60 degrees.
3. Electrical 0.5 WL.
4. This will be a university postgraduate theses.
5. The antenna is intended to be used at 1111MHz. However I dont' know
how high the driven element will be above the earth's surface.

With regards
Dimitris

Thank you for all your remarks and comments. Of course I will try to
keep you inform about my project. I feel that I owe an apology again
for my late responses. However, examinations are about to begin and
that's why I struggle to find a bit more time for my "internnet
communication". Therefore, because of the exams, I already have given
up a little bit the whole "antenna project".

However, in a couple of weeks, I'll resume my work on the antenna
project, which actually I baptized D-Dimond1 (is it catchy?), and I
would like to continue my communication with you in a more systematic
and responsible way.