Prototype Antenna?
 

Dear all,

Mrs. yin,SV7DMC and Mr. pez,SV7BAX of TheDAG
have strongly suggested your newsgroup,
to ask for support, help, comments or opinions
about antennas matters.
Well, I study this prototype antenna:

http://antennas.ee.duth.gr/recradioa...2Bcomments.gif

Does it remind you of any other antenna?
I want to know if it has been studied by anyone else before.
And I also want to give it a name...
All suggestions welcome!

Thank you in advance.

Yes, it reminds me very much of a modified "hentenna", with matching section
replaced by two of your half-wave dipoles...

Regards,
John

"superas_1988" wrote in message
oups.com...
Dear all,

Mrs. yin,SV7DMC and Mr. pez,SV7BAX of TheDAG
have strongly suggested your newsgroup,
to ask for support, help, comments or opinions
about antennas matters.
Well, I study this prototype antenna:

http://antennas.ee.duth.gr/recradioa...2Bcomments.gif

Does it remind you of any other antenna?
I want to know if it has been studied by anyone else before.
And I also want to give it a name...
All suggestions welcome!

Thank you in advance.

Can you make a better drawing? Cannot tell where the feedpoint is or where
the dipoles are connected,


"superas_1988" wrote in message
oups.com...
Dear all,

Mrs. yin,SV7DMC and Mr. pez,SV7BAX of TheDAG
have strongly suggested your newsgroup,
to ask for support, help, comments or opinions
about antennas matters.
Well, I study this prototype antenna:


http://antennas.ee.duth.gr/recradioa...2Bcomments.gif

Does it remind you of any other antenna?
I want to know if it has been studied by anyone else before.
And I also want to give it a name...
All suggestions welcome!

Thank you in advance.

I think that the drawning is clear enough.
As you have queries, though, let me explain.
Well, about the feedpoint, refer to the link I gave you:

"The source (=feedpoint) lies on the origin of the axes
and is represented by an arrow."

As for your second question,
the black dots on the drawing,
represent connections between the dipoles.

I wish this was helpful...
I want to thank you and I'm waiting for your comments.

Hal Rosser wrote:
Can you make a better drawing? Cannot tell where the feedpoint is or
where
the dipoles are connected,


"superas_1988" wrote in message
oups.com...
Dear all,

Mrs. yin,SV7DMC and Mr. pez,SV7BAX of TheDAG
have strongly suggested your newsgroup,
to ask for support, help, comments or opinions
about antennas matters.
Well, I study this prototype antenna:



http://antennas.ee.duth.gr/recradioa...2Bcomments.gif

Does it remind you of any other antenna?
I want to know if it has been studied by anyone else before.
And I also want to give it a name...
All suggestions welcome!

Thank you in advance.

You are right.
We can easily see that if the angle becomes 90 degrees
then my geometry is virtually that of the "hentenna".

John Smith wrote:
Yes, it reminds me very much of a modified "hentenna", with matching
section
replaced by two of your half-wave dipoles...

Regards,
John

"superas_1988" wrote in message
oups.com...
Dear all,

Mrs. yin,SV7DMC and Mr. pez,SV7BAX of TheDAG
have strongly suggested your newsgroup,
to ask for support, help, comments or opinions
about antennas matters.
Well, I study this prototype antenna:


http://antennas.ee.duth.gr/recradioa...2Bcomments.gif

Does it remind you of any other antenna?
I want to know if it has been studied by anyone else before.
And I also want to give it a name...
All suggestions welcome!

Thank you in advance.

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:
"superas_1988" wrote in message
ups.com...
I think that the drawning is clear enough.
As you have queries, though, let me explain.
Well, about the feedpoint, refer to the link I gave you:

"The source (=feedpoint) lies on the origin of the axes
and is represented by an arrow."

As for your second question,
the black dots on the drawing,
represent connections between the dipoles.

I wish this was helpful...
I want to thank you and I'm waiting for your comments.

Hal Rosser wrote:
Can you make a better drawing? Cannot tell where the feedpoint is or
where
the dipoles are connected,


"superas_1988" wrote in message
oups.com...
Dear all,

Mrs. yin,SV7DMC and Mr. pez,SV7BAX of TheDAG
have strongly suggested your newsgroup,
to ask for support, help, comments or opinions
about antennas matters.
Well, I study this prototype antenna:




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

Does it remind you of any other antenna?
I want to know if it has been studied by anyone else before.
And I also want to give it a name...
All suggestions welcome!

Thank you in advance.

Dear J. Mc Laughlin
First of all, I want to apologize for replying late.
Answers:
1. Yes, it is true.
2. No, the angle is meant to be 45 degrees. Sorry for the bad drawing.
3. The length of each dipole is an electrical 0.5 WL.
4. It is a university project. I am a postgraduate student of
"electrical and computer engineering".
5. No, it is not. In fact, I'd be rather lucky if we even manage to
construct it at all.

i'll build it
but why dont you modify the design the 2 trapeziods could be made into 4
with a center feed this would give you something like a stacked quad
arrangement and at least twice the gain
dave
oh and you will need a transmatch for the feed point as it will be no where
near 50 ohms where it is at present

Dear superas_1988

Please see my message to Dimitris and my message of May 3, 2005 called
"Greek Double Rhombus." I modeled the antenna with a 60 degree angle.

Many are interested in how you arrived at a particular angle.

Good luck on the project.
Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
Home:
"superas_1988" wrote in message
oups.com...
Dear J. Mc Laughlin
First of all, I want to apologize for replying late.
Answers:
1. Yes, it is true.
2. No, the angle is meant to be 45 degrees. Sorry for the bad drawing.
3. The length of each dipole is an electrical 0.5 WL.
4. It is a university project. I am a postgraduate student of
"electrical and computer engineering".
5. No, it is not. In fact, I'd be rather lucky if we even manage to
construct it at all.

I'm not insisting in this particular angle.
In fact, this is only a starting point;
I am planning to alter the angle
and thus study many different variations of the antenna
so as to decide which is "the best".
Thank you all for your interest.

p.s.: Could you suggest a name based on its geometry?