There are new antennas that go under the names:
US Patent 6,025,813
Australian builder of Crossed Field Antennas
Article on theory of Crossed Field Antennas part one from AntenneX Magazine
US Patent 6,486,846
These antennas are considerably smaller than the conventional Hertzian antennas.
I have built an E/H antenna for 20 Meters. It performs with a strange enigma, local stations are down in the static but distant ones although weaker are better in signal to noise ratio than my rooftop dipole.
For instance I can receive Havana Cuba and the Caribbean
Islands clearly just holding this antenna in my hand on the ground floor
of my house. However a signal from Jim VE4MT of 150 watts and a beam pointed
right at me is just barely detectable from a distance of 1/2 the width
of the city.
Photos of antennas built by Willard
Constructed Nov. 11 2002
Constructed Feb. 20 2004
Three views of my 20 Meter antenna
The above antenna has been used for 2 way contacts from Winnipeg to
New Tripoli, Pensilvania
and Hallifax Nova Scotia
from inside on the second story
The Antenna below was constructed March 5 2004
This version is for 80 Meters
Here is a closup of the input Coil assembly
Here is another view of the coils
Those are ordinary hair combs to get the required turn spacing of 0.125 inches
This antenna outpreforms my 35 foot outdoor vertical while
sitting on my coffee table on the ground floor
This is my new design of the 80 meter antenna
January 16, 2005
Here is a closup of the coil section
Many people think a radiator this small is imposible and the only way they work is that the feed coax is radiating.
Here is proof that that is not true Added on March 11, 2003
Here are links to E/H Inventor Ted Hart and some builders of E/H Antennas:
Jack Arnold W0KPH an expert on E/H antennas
Stephano Galastri (Italy)
Antenna for Packet Radio
Test of an E/H antenna as compaired to a GP antenna
Lloyd Butlers Page VK5BR
Larry D. Brown'a Web Page Excellent builder of E/H antennas
New design for the Star Antenna December 2004
I have removed my previous
theory due to having received information that the width of the radiators
controls the beam width. If the radiators are reduced from 7.5 inches to
4.5 inches the antenna can be used for local transmition and reception.
The 7.5 inch radiators are best for DX as the signal goes directly to the
ionospere. I plan to do some testing of the antenna to deturmin the pattern
of the beam with various radiator lengths.
I am now building 3 versions of this antenna for 40 Meters. One will be the Ted Hart Network. One will be a coax delay. And the final one just a matched link. We will compare the three versions. After discussing the antenna with a friend of mine who is well versed in RF we came to a conclusion. It would seem that the 90 degree delay theoretically does nothing for the antenna. A capacitor feeding the E field is still a capacitor feeding the E field whether it is delayed 90 degrees or not. The matched link should be just as good.
By experimentation it has just been found that the beam
width is deturmined by the distantce between the center of the radiators
and the center of the resonant coil. The beam width is appearently the
result of the offset between the Electric field and the Magnetic (H) field.
These are radiated in a cancellation manner such that, if the resonant
coil is between the radiator tubes the radiation is virtually cancelled.
The fact that the coil is not in the center of the radiator tubes but is
beyond the end of one of them, results in some radiation that is not cancelled.
This is the beam. This beam is much narrower than previously assumed*
and results in communications that are received by relatively few hams.
However when a signal is propagated both hams have a good strong contact
and the signal is relatively noise free.
Tests will now be conducted to find out what this beam width is.
As a comparison to Crossed Field see the Magnetic loop antenna
A new loop antenna with pin diode tuning is patented #6,304,230
This page last updated December 16, 2006
This page is composed by Willard Elliott