[TowerTalk] modeling a v shaped dipole

[jimlux]

Gary Slagel wrote:
> Hi guys,
> 
> I tried to model a v shaped dipole yesterday and was surprised by the
> results.  I'm looking at a dipole with the ends bent back toward each
> other rather then an inverted vee.  I started with a straight dipole,
> then bent the ends toward each other so they enclosed a 135 degree
> angle, then bent them to enclose a 90 degree angle, and last a 45
> degree angle.
> 
> The azimuth pattern I got was identical for each configuration.  The
> direction was different depending on how I rotated the wire to change
> the angle, but the pattern was identical.
> 
> Does this seem reasonable or was I making an error or does eznec have
> a problem modeling this?  I was using the free eznec provided with
> the arrl antenna book.
> 
> 

the entire antenna is all in a flat plane? so it's looking sort of like 
a big "C"

Most of the pattern is determined by the middle of the dipole, so 
bending the ends doesn't do much other than change the feedpoint 
impedance. a half length (1/4 wavelength long overall) dipole with 
capacity hats to make it resonant has almost exactly the same pattern as 
a full sized dipole.

In fact, an idealized dipole has about 2.2 dBi gain, while an 
infintesimally small dipole (called a Hertzian dipole) has a gain of 
about 1.7 dBi.. unless you plot the two patterns on top of each other, 
you wouldn't notice the difference.