cloverleaf anenna?
 

Stefan Bürbaum wrote:
In a antenna lexicon I found something about a cloverleaf antenna from
Phillip H. Smith. I found only Pics from this type in use (or out of order)
for BC stations.

I'm not aware of any vertical antennas with cloverleaf patterns
so I am going to assume it is a horizontal antenna (as used for
BC shortwave).

A horizontal dipole longer than 1.25WL tends to have a multi-lobed
radiation pattern, at one point, resembling a cloverleaf. Such a pattern
is pretty much four-lobed when the dipole is about 1.6WL. At shorter
wavelengths than that, it exhibits more than four lobes and at high
multiples of the 1/2WL resonant frequency, becomes essentially an
end-fire antenna.
--
73, Cecil, W5DXP

Stefan Burbaum wrote:
"Can anyone tell me more about this type?"

John D. Kraus, W8JK says about the Cloverleaf Antenna for FM
Broadcasting on page 429 of his 1950 edition of "Antennas":
"One method of simulating the uniform loop is illustrated in Fig.
14-38b. Here four smaller loops are connected in parallel across a
coaxial line. This arrangement is called a "cloverleaf" antenna. (P.H.
Smith, Cloverleaf Antenna for FM Broadcasting, Proc. I.R.E.,35,
1556-1563, December 1947)."

Best regards, Richard Harrison, KB5WZI

Kraus retained his "Cloverleaf Antenna" story in his new 3rd edition. It
is found on page 726. Almost identical to the 1950 story.

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:
Kraus retained his "Cloverleaf Antenna" story in his new 3rd edition. It
is found on page 726. Almost identical to the 1950 story.

Darn, I should have looked in the index of my Kraus book before
I replied in ignorance.
--
73, Cecil, W5DXP

"Cecil Moore" wrote in message
...
Stefan Bürbaum wrote:
In a antenna lexicon I found something about a cloverleaf antenna from
Phillip H. Smith. I found only Pics from this type in use (or out of
order)
for BC stations.


I've made and used a cloverleaf antenna for 2m in a RSGB 2m Trophy contest.

Used two of them stacked for extra gain.

Results were very good and allowed up complete coverage of the UK.

Cecil Moore wrote:
Stefan Bürbaum wrote:

In a antenna lexicon I found something about a cloverleaf antenna from
Phillip H. Smith. I found only Pics from this type in use (or out of
order)

for BC stations.

I'm not aware of any vertical antennas with cloverleaf patterns
so I am going to assume it is a horizontal antenna (as used for
BC shortwave).

A horizontal dipole longer than 1.25WL tends to have a multi-lobed
radiation pattern, at one point, resembling a cloverleaf. Such a pattern
is pretty much four-lobed when the dipole is about 1.6WL. At shorter
wavelengths than that, it exhibits more than four lobes and at high
multiples of the 1/2WL resonant frequency, becomes essentially an
end-fire antenna.
--
73, Cecil, W5DXP

I Remember back in early 60's a number of hams in my home town built
clover leaf antennas for 2 & 6 meters.. if my memory serves me right
they were horizontally mounted and worked quite well for 2 & 6 Mtr AM
in those days .. I used one as a novice for 2 mtrs. Novices had 2m AM
priviledges back then. But I had nothing to compare it to so can't say
it was better or worse tnan any other 2m antenna. Also if memory serves
me right it was mad up of 3 heart shaped full wave loops condected in
paralell and fed with a single coaxial line.

73 Dave Kc1di


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"KC1DI" wrote in message ...
Cecil Moore wrote:
Stefan Bürbaum wrote:

-- SNIP--

I Remember back in early 60's a number of hams in my home town built
clover leaf antennas for 2 & 6 meters.. if my memory serves me right they
were horizontally mounted and worked quite well for 2 & 6 Mtr AM
in those days .. I used one as a novice for 2 mtrs. Novices had 2m AM
priviledges back then. But I had nothing to compare it to so can't say it
was better or worse tnan any other 2m antenna. Also if memory serves me
right it was mad up of 3 heart shaped full wave loops condected in
paralell and fed with a single coaxial line.

73 Dave Kc1di

I still have such an antenna -- for two meters. It is the Cuschcraft Big
Wheel. It consists of
3 vertex-rounded triangular elements. I think they are a full wavelength
with one side of each
connected to the center conductor of the coax and the other side of each
connected to
ground. So it looks like a cloverleaf. It produces an omni-directional
pattern. My antenna has four of these stacked with phasing harnesses.

The original inquiry mentioned for use at broadcast frequencies, so I doubt
that the Big Wheel
is what is meant.

Ed, N5EI

Richard Harrison wrote:

"Can anyone tell me more about this type?"

John D. Kraus, W8JK says about the Cloverleaf Antenna for FM
Broadcasting on page 429 of his 1950 edition of "Antennas":
"One method of simulating the uniform loop is illustrated in Fig.
14-38b. Here four smaller loops are connected in parallel across a
coaxial line. This arrangement is called a "cloverleaf" antenna. (P.H.
Smith, Cloverleaf Antenna for FM Broadcasting, Proc. I.R.E.,35,
1556-1563, December 1947)."

Thank you.
Is this old book the only with a description of this antenna?

I found a pic from the WNEX Antenna:
http://www.theinternetfarm.com/goodt.../wnexhist5.htm

Is there a scan from the pic in the book in the net?
Its very old, it should be free?

Why is this type of antenna not in use?
I know, the Big Wheel is a very good construction and very popular.
What was the advantage of Smith's cloverleaf antenna?


Stefan B=FCrbaum, OE3SBA

Stefan Burbaum wrote:
"Is this old book the only with a description of this antenna?"

No. The new 3rd edition of "Antennas" also has the "clover-leaf" on page
726 along with several similar types.

I`ll speculate that the horizontally polarized omnidirectional antenna
has faded in popularity due to so many automobile FM radios in use.
Vertical or circular polarization may be better for line-of-sight
propagation to an automobile which is equipped with a vertical car
antenna.

Best regards, Richard Harrison, KB5WZI