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Thread Subject:
plotting radiation pattern in 3-D

Subject: plotting radiation pattern in 3-D

From: Windell

Date: 14 Aug, 2009 05:03:01

Message: 1 of 3

Hi,

I have taken a lot of data of an antenna's radiation pattern at many different elevations and elevations. I have successfully used a custom written function called "dirplot" to create seperate plots of the data on a 2D plot. Each plot represents only a single elevation.

I would like to go a step further and plot the data from each elevation in spherical coordinates. For each data point I have an azimuth, elevation and power reveived. I would use sperical coordinates, however my problem exists in that the power levels are expressed in negative values. For example -20dB is a higher gain than -40dB so I can't just get rid of the negative without obscuring the meaning of the data.

Any suggestions?

Much Apperciated!
Windell Jones

Subject: plotting radiation pattern in 3-D

From: Darren Rowland

Date: 14 Aug, 2009 08:48:03

Message: 2 of 3

Find the minimum gain value e.g. -120dB, then add 120 to all of your data.
Hth
Darren

Subject: plotting radiation pattern in 3-D

From: Windell

Date: 14 Aug, 2009 22:33:04

Message: 3 of 3

"Darren Rowland" <darrenjremovethisrowland@hotmail.com> wrote in message <h638c3$4dt$1@fred.mathworks.com>...
> Find the minimum gain value e.g. -120dB, then add 120 to all of your data.
> Hth
> Darren

Thanks, Darren! That is definitely the simplest way to go. Is it possible to draw a line through each elevation's set of points when I'm using spherical coordinates?

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