[Elecraft] E-H Antenna Simulation in NEC

[Stuart Rohre]

Trev,
There is only one set of laws for Physics, you cannot invoke an exception
for any one Antenna!  No, there is nothing in the claimed operation of the
EH that should not respond to the same method of moments calculations as the
simple dipole or any other antenna, for antenna modeling breaks ANY antenna
into miniscule parts looking at the effects of current upon tiny sections
then adding all those up to get the overall effects.  If an antenna fails by
that standard, it is not converting current to radiation as efficiently as
standard antennas.  (Those existing for many years).

The EH antenna attempts to corrupt the well known Maxwell's Equations and
consider only the E field separately from H field, while it has been known
and can be demonstrated that an E field always produces an H field and vice
versa, and they interact together to produce the radiating wave.

There is no free lunch, if you do not provide sufficient structure of low
losses,  and the appropriate discontinuity, (see "Antennas" 2nd Ed. by
Kraus),  to launch a certain wavelength, the efficiency of that launch is
compromised.

The structure must be sufficient to overcome the losses of any matching
network used to transfer the energy to the antenna.

As to where does the heat go in your EH, there are a number of places.
Mismatch losses in the feeder may be allowing less current in the antenna
than you assume.  Have you inserted an RF ammeter between the rig and a
dipole, and the rig and the EH for comparison?

Most ham signals are not key down for long periods which would introduce
noticeable heating, ie low duty cycle.  Heat starts to build up and then
dissipates in metal structure of the antenna, to air, and feedline braid
along its length, into the dielectric of the feeder, etc.  Have you looked
at the sample with a thermometer that can detect small rises in temperature
of the materials?

"Working" of an antenna can be done with a small percentage efficiency, but
a fraction of the total source power.  The signals would be so much better
if the antenna did perform at top efficiency.  Using superconductors for the
matching network would enhance the possibilities of the EH.  But, in open
air, all antennas have to exhibit the Physics upon which modeling is based,
and used not only for antennas performance, but Moments are used to analyzer
performance of airframes, cars, roads, bridges and any system appropriate to
dissection into its basic parts.
73, Stuart K5KVH