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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