Guy from university physics dept. makes claims to incite/provoke amateurs!
 

On 26 Jun, 20:52, John Smith I wrote:
art wrote:

...

but it does come to mind that the aperture, which is related to gain,
...
Regards
Art

Yes Art, this IS the most perplexing of all ... the aperture ...

How can you reduce an antenna with a "capture" of 1, to a "capture" of
.3333333 and not suffer a signal loss of related proportions.

I ponder this.

Regards,
JS

Look at the antenna book by Jasik , small antennas
section, where he shows examples of the increased aperture
by adding a top hat. The aperture diameter INCREASES
because of the side projection of the top hat, at
least thats the way he shows it.
Difficult to determine the fulcrum point for all cases shown
with a cursury look.
Regards
Art

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

art wrote:

...

Art:

For my "rule of thumb" uses, the equation:

0.13 x (wavelength)2

gets me into the ballpark. And, although the aperture of a thin wire is
almost nil, it is pictured as an ellipse-squared in the material I have
digested, the preceding equation giving its effective aperture area ...

You got anything better?

Regards,
JS

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

John Smith I wrote:

I also meant to include in the above post, this antenna performs
admirably well with NO top hat (only a short whip) ... indeed, in that
form the "disrespect for aperture" is most notable.

JS

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

John Smith I wrote:
Actually, old news from 3 years ago ...

http://www.eetimes.com/showArticle.j...cleID=21600147

JS

I am taking for granted that everyone realizes the inventor can be
emailed directly:



Regards,
JS

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

John Smith I wrote:

[chit]

OK. So I went and wrote the inventor, the correspondence follows, he
knows naysaying idiots when he sees 'em--I think the following makes it
quite obvious:

Thanks John but I pay very little attention to that stuff. I now have a
patent on the DLM and 6 more pending and several new applications in
electromagnetics and antennas. I work with the EE dept here at URI and also
with the physics dept. as well as several other departments where my antennas
and expertise are being well received. I now also work with many undergrad
and post grad students.

The DLM works, they just don't want to admit it to themselves. What the DLM
does is it stores magnetic potential energy in the inductance of the helix and
moves it to another part of the antenna. In doing so creates a very large
current profile along the antenna. It is 2.778 times greater that for a
quarterwave for the same power input, hence it is why it is about 1/3 the
size. I also invented the flat helix which makes the fully planner DLM
possible.

Anyway it has been licensed to several applications including cellphones, RFID
and automotive applications. A large automotive supplier has it licensed for 6
applications with 4 more coming, One of these has been in tire pressure
monitoring, using my antenna they invented the first batteryless RFID tire
pressure monitor. Expect to use between 90 and 100 million antennas in 2008 in
just this one application. They went from a nobody in that market to most
likely owning it.

Within a few years I will be a multi millionaire so you see I just don't give
a dam what they think. Can you blame me, I am laughing all the way to the
bank.

I am now into thinfilm and monilithic antennas using DLM antenna technology. I
now have antennas so small operatng in the Ghz region that you need to use a
microscope to see them.

Thanks for the info but I pay very little attention to what THOSE people say,
think etc. They are pretty ignorant. Best regards and good to hear from you.
Rob


===== Original Message From John Smith I =====
Mr. Vincent:

Your DLM antenna has some discussion going on about it in amateur circles.

You may wish to view the usenet news group "rec.radio.amateur.antenna"

And, specifically, the thread:

Guy from university physics dept. makes claims to incite/provoke amateurs!

There have been a couple of naysayers! grin

Warm regards,
JS

Robert Vincent
Dept of Physics
University of Rhode Island
401-874-2063



And, if you think EZNEC (and ALL other software emulation of real world
constructions) is doing anything but running you in circles about the
past--think again ... of course if all you wish to find is the past--it
serves well ...

Regards,
JS

Guy from university physics dept. makes claims to incite/provoke amateurs!
 

On Wed, 27 Jun 2007 08:01:44 -0700, John Smith I
wrote:

John Smith I wrote:
Actually, old news from 3 years ago ...

http://www.eetimes.com/showArticle.j...cleID=21600147

JS

I am taking for granted that everyone realizes the inventor can be
emailed directly:



Regards,
JS



the spammers will love this, but he will regret your posting his url
openly.



--
73 for now
Buck, N4PGW

www.lumpuckeroo.com

"Small - broadband - efficient: pick any two."

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

John Smith I wrote:
Buck wrote:

...
the spammers will love this, but he will regret your posting his url
openly.

Naaa ...

He works at a university, trust me, if he can't stop the spam from being
in his mailbox, a co-worker/student can!

Ever try gmail? That one simple tool allows me to freely give out my
email ... if the spammers get though it, I will evoke other counter
measures ... spam is only a problem for the computer illiterate ...


Who ever head of posting url's in a newsgroup? (joke)


That page appears to be the original one that came out in 2004. It's
missing one part though. In the original release, there was a mention of
how efficient the antenna was, proof cited was how when he turned the
power up to 100 watts, the antenna melted. That part is gone. I googled
up the thread to see if my memory was bad, but it wasn't. The release
must have been revised.

So has there been a breakthrough in how the antenna maintains a
constant current through it? Can we assume the voltage must be constant
also?



- 73 de Mike KB3EIA -

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

Michael Coslo wrote:
So has there been a breakthrough in how the antenna maintains a
constant current through it? Can we assume the voltage must be constant
also?

If the ends of a 1/2WL dipole are terminated to
ground by ~1000 ohm resistors, the antenna current
is relatively constant. :-)
--
73, Cecil http://www.w5dxp.com

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

Michael Coslo wrote:
... It's
missing one part though. In the original release, there was a mention of
how efficient the antenna was, proof cited was how when he turned the
power up to 100 watts, the antenna melted. That part is gone. I googled
...
- 73 de Mike KB3EIA -

Actually, if you don't get the coils in the proper ratio/position to
each other, efficiency drops DRAMATICALLY!

Like usual, the best configuration to give the best reception of a known
and stable signal also results in the antenna being to configured to
achieve maximum radiation ...

Or simply, if the antenna isn't performing as a full length 1/2
wave--reconfigure 'till it does! Which, using the test fixture I
supplied, is done quickly with no problem ...

JS

Guy from university physics dept. makes claims to incite/provokeamateurs!
 

Cecil Moore wrote:

...
If the ends of a 1/2WL dipole are terminated to
ground by ~1000 ohm resistors, the antenna current
is relatively constant. :-)

Cecil:

In one of the configurations of a 1/2 wave, the bottom helix and length
of the straight length of radiator ends up right at ~8.1 ft. The upper
loading coil and top-hat/upper-radiator ends up being ~8.1 ft. This,
most likely, helps to force the current into that upper loading coil.
As, Robert Vincent, has mentioned something about "storing" the rf
energy in the bottom helix with the effect of it having a relationship
to "driving" the upper portion of the antenna.

I don't know, he has offered me a CD with complete data on the antenna,
I am arranging a anonymous address to have the CD shipped to now ...

JS