[TowerTalk] antenna impedance anomaly

[Jim Lux]

-----Original Message-----

From:  "Al Williams" <alwilliams at olywa.net>
Subj:  [TowerTalk] antenna impedance anomaly
Date:  Fri May 27, 2005 10:37 am
Size:  2K
To:  <towertalk at contesting.com>

Not too long ago, when I asked why reflectors of a Yagi are longer than the driven element and directors of I decided that yes, that is the way it is.  What the computer can do in a fraction of a second is beyond what I could do.

***Or, you can calculate the effects analytically using a fair amount of calculus.  The computer is basically doing numerical integration.


However I "discovered" what seems very odd to me and am hoping that Towertalkians can  explain it.

I modeled  

But the phase angle of each segment (except the center one) always was negative with increasing angle as the segment chosen goes to the end of the element.
Why do individual segments  ....

k7puc
**
It takes some finite amount of time for a signal to propagate down the wire.   The phase of the current is different for the same reason it is in a transmission line.  An antenna is more complicated because every part radiates to every other part, but the general isdea is the same.

Jim Lux