Follow up on beam patterns - Electronic Circuits Projects Diagrams Free

Electronics4you · 22nd July 2006, 12:40 PM

Hi There,

I just need an answer on a very simple (not to me) question.
What does the x-axis of this beam pattern represent? Lenght, time...?

**Nigel Goodwin** · 22nd July 2006, 12:51 PM

There's isn't really an x-axis, just a y-axis and an angular value. As the y-axis rotates 90 degrees it appears where the x-axis would be on a normal graph. The graph should really show 180 degrees, and not just 90 degrees.

Electronics4you · 22nd July 2006, 12:52 PM

Ok, but the 1', 2'... must mean something, normally it would be the signal power in dB

**Nigel Goodwin** · 22nd July 2006, 01:03 PM

Quote:

Originally Posted by Electronics4you

Ok, but the 1', 2'... must mean something, normally it would be the signal power in dB

Could be power, could be distance - pretty much the same thing anyway.

JimB · 22nd July 2006, 03:53 PM

For a graph like this, it is probably best not to think of it having an "x-axis".

This is a "polar plot", where something is plotted against an angle.
The "x-axis" is just the scaling of the radial rings.

But what that scaling is, is a bit vague.

The notation 1', 2', 3' etc infers a distance measurment in feet.
Maybe the distance from the source which gives some signal strength.

Vague and ambiguous is my best description for it.

JimB

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22nd July 2006, 12:40 PM	#1
Electronics4you	Follow up on beam patterns Hi There, I just need an answer on a very simple (not to me) question. What does the x-axis of this beam pattern represent? Lenght, time...? Attached Thumbnails

22nd July 2006, 12:51 PM	#2
Nigel Goodwin	There's isn't really an x-axis, just a y-axis and an angular value. As the y-axis rotates 90 degrees it appears where the x-axis would be on a normal graph. The graph should really show 180 degrees, and not just 90 degrees. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

22nd July 2006, 12:52 PM	#3
Electronics4you	Ok, but the 1', 2'... must mean something, normally it would be the signal power in dB

22nd July 2006, 03:53 PM	#5
JimB	For a graph like this, it is probably best not to think of it having an "x-axis". This is a "polar plot", where something is plotted against an angle. The "x-axis" is just the scaling of the radial rings. But what that scaling is, is a bit vague. The notation 1', 2', 3' etc infers a distance measurment in feet. Maybe the distance from the source which gives some signal strength. Vague and ambiguous is my best description for it. JimB __________________ Experience is directly proportional to the value of the equipment ruined.