"dansawyeror" wrote in message
...
All,

I have been experimenting with various loaded antennas to use in my
relatively limited space. For this I assumed the two arms of a dipole must
be identical to support resonance, this assumption has not been supported
by modeling.

Actual model runs show that if the two arms of a dipole are close then
there is sufficient interaction that they will combine to form a single
resonance. The model below shows a simple example of this. The loads and
length of the arms are not equal, however nec predicts a single resonance
at about 3.5 MHz. Changes of 10 to 20 percent around resonance seem to
create one resonance.

Is there an explanation for this?

Thanks - Dan kb0qil

No matter what Dan, you should see only one resonance at the overall length
of a half wave. Not that resonance has any bearing on antenna efficiency.

Also; your NEC model has uneven segmentation, which does produce significant
errors. Interesting to note that your antenna is also resonant at 7 MHz.

73,

Frank