10-19-2012 05:50 AM
Hi, I would appreciate if somebody from Aruba could comment on this.
I was looking at the ap 135 H-plane and E-plane thinking that these are horizontal and elevation planes.See the link:
Hoewer some people in our organization think that E-plane is electromagnetic plane.
Could you confirm which one is the E-plane as I want to be sure I am able to read the plane it as I was taught.
Thanks a lot.
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10-19-2012 06:01 AM
Well from a physics point of view, an electromagnetic wave consists of an electric (E plane) and magnetic (H plane) component.
But in these diagrams, it is Elevation and Horizontal (or Azimuthal) patterns. If you have a look at the patterns from one of the directional antennas, you'll see it more clearly.
10-19-2012 07:32 AM
Well see the reply which I got It is difficult to pursuade somebody who think knows everything. This time I need to prove, he is wrong as we had different type of conversation which he was definitely wrong but he just expleined himself that he is right. As it is my boss and I left him. But this is too much. I have been doing wireless for last 3 days and read many of charts like that and made perfect sence of them. as the APs are meant to be ceiling mounted it is understable that the signal will prapagate less through the back plate once it is on the ceiling. The heat map is confirming what you can read on the chart. I think he is just playing with words but as I got my education elsewhere I don't know the English terminology well enough to be able to compete in 'playing words' Anybody could help?
>> Hi Pete,
>> I followed up our conversation and I can confirm that the planes in this
>> are Elevation and Horizontal (or Azimuthal) patterns.
> I don't think so. There's nothing in the document to suggest that
> they're anything other than the standard antenna terminology, which
> means Electric Field Plane (E) and Magnetic Field Plane (H). That's
> basic antenna/RF engineering stuff. H is the symbol for magnetism.
> Besides, we both know that the radiation pattern from those APs is not
> spherical; it's roughly toroidal. If those diagrams were horizontal and
> vertical, they would be describing an almost perfect sphere.
10-19-2012 09:03 AM
I can't do that. He needs to acknowledge my skills and stop undermining my ideas and suggestions with silly unthroughtfull comments feeding his ego.
So anybody from Aruba? If not I'll have to open a case
10-19-2012 11:08 AM
I'm with Aruba, and am the person who created the antenna plots. They indeed represent the Elevation and Horizontal (or Azimuth) cut of what is essentially a 3D pattern view.
Let me know if you have any additional questions.
10-19-2012 11:19 AM
BTW, it is true that RF energy has an electrical and magnetic component, but this is not relevant for antenna plots, which show the relative amount of (total) RF energy for the antenna (in space or a plane), compared to that of an ideal isotropic radiator (which has a perfectly spherical pattern) using the same input signal. This relative amount is expressed in dBi and called antenna gain. In addition, the plots in the AP-135 datasheet have been normalized, meaning that they were adjusted to a max of 0dBi. So instead of showing a maximum gain matching the gain numbers specified elsewhere in the DS, they show a max of 0dBi
10-19-2012 02:13 PM
I have a short video in my series on outdoor network engineering that explains antenna patterns and how to read the pattern plots.
you can watch the video here - http://www.arubanetworks.com/technology/engineer-v
it's the video in the upper left corner.