Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
New Member

How to interpret radiation pattern?

Hi there

Who can tell me how to interpret the Radiation patterns in the antenna guide?

For example the Aironet 1000 integrated antenna.

I can't see how the AP is placed and orientated in the patterns.

Where is A-side/B-side (elevation)?

Am I looking on the top or bottom of the AP, is it vertical (0 to 180 degree) or horizontal (270 to 90 degree) orientated (azimuth)?

I would be very thankful for some advice.

Stephan

1 ACCEPTED SOLUTION

Accepted Solutions
Green

Re: How to interpret radiation pattern?

Azimuth diagrams are usually with the the device/antenna in normal operating orientation (vertical, top up, in the center of the diagram for omni; horizontal,mount at the center, forward direction towards "0" on the diagram).

The "A" side would most likely be "forward" represented at the "0" mark for azimuth, and the 90 mark for elevation.

The "B" side would be represented at the 180 mark for azimuth, and 270 for elevation.

The pattern would not change in free-space if the unit was inverted ... but keep in mind that the immediate surfaces can cause reflection/absorbtion and can alter the pattern. Metallic objects near the radiators (within ~2 wavelengths or so) can also distort the pattern significantly.

Here's a link to Cisco's antenna info; the 1000 series ia at the bottom.

For reference, if you move up a couple to an omni, you'll see the pattern is (more-or-less) circular in the azimuth, and predominantly oriented to 90/270 (representing the horizon) for the elevation, with some minor lobes above and below the primary.

The omni is positioned vertically, base at the bottom. Azimuth looks from above, elevation looks from the side.

http://www.cisco.com/en/US/products/hw/wireless/ps469/products_data_sheet09186a008008883b.html

Good Luck

Scott

1 REPLY
Green

Re: How to interpret radiation pattern?

Azimuth diagrams are usually with the the device/antenna in normal operating orientation (vertical, top up, in the center of the diagram for omni; horizontal,mount at the center, forward direction towards "0" on the diagram).

The "A" side would most likely be "forward" represented at the "0" mark for azimuth, and the 90 mark for elevation.

The "B" side would be represented at the 180 mark for azimuth, and 270 for elevation.

The pattern would not change in free-space if the unit was inverted ... but keep in mind that the immediate surfaces can cause reflection/absorbtion and can alter the pattern. Metallic objects near the radiators (within ~2 wavelengths or so) can also distort the pattern significantly.

Here's a link to Cisco's antenna info; the 1000 series ia at the bottom.

For reference, if you move up a couple to an omni, you'll see the pattern is (more-or-less) circular in the azimuth, and predominantly oriented to 90/270 (representing the horizon) for the elevation, with some minor lobes above and below the primary.

The omni is positioned vertically, base at the bottom. Azimuth looks from above, elevation looks from the side.

http://www.cisco.com/en/US/products/hw/wireless/ps469/products_data_sheet09186a008008883b.html

Good Luck

Scott

277
Views
5
Helpful
1
Replies
CreatePlease to create content