[TowerTalk] Horizontal Dipoles

[Lux, Jim]

On 1/10/22 4:10 PM, Don wrote:
> Question for the antenna gurus on this site.
>
> I don't have any modeling SW nor experience with such SW. With that 
> known, I have a question about a horizontal 1/2 wave dipole at a 
> single height.
>
> I understand the radiation pattern for a straight dipole, old school.
>
> What I want to know is the pattern when a dipole has one leg 90 
> degrees from the other, again at a single height (not an inverted V).

Like a V, all in a horizontal plane?

You'll see this sometimes referred to as a skew dipole.

It has a dipole like pattern, oriented broadside to the "opening" of the V.

The phase center is about 1/3 of the way down the V.  The gain is 
slightly lower (A perfectly straight dipole is 2.1 dBi, an infinitely 
short dipole is 1.5 dBi, a V is somewhere in between)

The impedance is closer to 50 ohms (a spread of 120 degrees puts you 
right around 50 ohms as I recall)

They're pretty common on LPDAs for higher frequencies (TV receive antennas).


If you want omni, that's done with a turnstile (3 or 4 dipoles in a 
circle).  See, e.g., BigWheel antennas for VHF and UHF, or a Lindenblad 
(for CP omni)


> Would it be similar to a quadrant antenna, and almost omnidirectional? 
> A friend contends not, that the quadrant antenna is a full wave 
> dipole, not a 1/2 wave and the pattern would be askew but not omni.
>
> Answers?
>
> Don W7WLL
>
>
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