Bill,Yes, thank you. I should have been more clear in my description.
Stephen
On Friday, July 1, 2016 4:46 PM, Bill Stumpf <[email protected]> wrote:
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div.yiv8813039613WordSection1 {}#yiv8813039613 I think perhaps Stephen is
referring to the 3-dimensional radiating pattern of the antenna, meaning
recording all of the antenna radials in the sphere as a 3 dimensional pattern.
That being said, there should likely only be one radial of maximum emission.
Bill From: Ed Price [mailto:[email protected]]
Sent: Friday, July 01, 2016 3:06 PM
To: [email protected]
Subject: Re: [PSES] Antenna gain measurement standard Stephen: I will
have to defer to someone who knows what 2D & 3D means, because I don’t. I have
also not heard of “maximum” gain. Gain is usually defined along the radial of
maximum emission, and despite most antennas being rather obvious which
direction that is, the best way is actual measurement. Perhaps you know this
already, but you can visualize radiation as the power radiating through an
imaginary transparent sphere enclosing the antenna. An antenna will usually
create a main lobe and many lesser sidelobes. Identifying the axis of the main
lobe can be time intensive, especially if you have a complex antenna structure
and no initial idea of how it will perform. The antenna gain will be a
combination of antenna efficiency and directional gain (think of how a
flashlight may have internal losses and a very narrow emission beamwidth). If
you have a high directional gain, the beamwidth may be only a half-degree in
both the azimuth and altitude axes, and finding the center of this invisible
beam may take hours of scanning (as you have to scan every radial around the
sphere). Accurate jigging is a must, followed by methodical investigation.
Ed Price
WB6WSN
Chula Vista, CA USA From: Stephen Whalen [mailto:[email protected]]
Sent: Friday, July 01, 2016 12:17 PM
To: [email protected]
Subject: Re: [PSES] Antenna gain measurement standard Ed, Thanks for the
response. I am looking to measure the gain of an antenna in order to calculate
EIRP of a product. As far as the 2D vs. 3D, I don't have any values. I was
hoping some one who has made measurements using both 2D and 3D would be able to
comment how much better 3D is over 2D when considering peak gain. I
appreciate your feedback, thanks. Stephen On Friday, July 1, 2016 3:00
PM, Ed Price <[email protected]> wrote: Stephen: There are a number of ways
to measure gain, with the basic one being a comparison to a theoretical
isotropic radiator (yielding a gain number in dBi). However, the antennas used
for EMI and compliance testing are usually used in the near field, where the
standard you are testing to defines the acceptable measurement distance and
styles of antennas. Thus, there is often a preferred gain measurement technique
defined by the standard you are working to. In regard to what you told us,
what is 2D & 3D (dimension) gain? And what is peak gain? What standard is
defining these terms? Ed Price
WB6WSN
Chula Vista, CA USA From: Stephen Whalen [mailto:[email protected]]
Sent: Friday, July 01, 2016 8:01 AM
To: [email protected]
Subject: [PSES] Antenna gain measurement standard Greetings, Does anyone know
which standard is used for measuring antenna gain? Are 3D antenna gain
measurements typically different than 2D with regards to peak gain? If so,
what's typical delta, 0.5dB or less? Regards, Stephen -
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David Heald <[email protected]> On Friday, July 1, 2016 3:00 PM, Ed Price
<[email protected]> wrote: Stephen: There are a number of ways to measure
gain, with the basic one being a comparison to a theoretical isotropic radiator
(yielding a gain number in dBi). However, the antennas used for EMI and
compliance testing are usually used in the near field, where the standard you
are testing to defines the acceptable measurement distance and styles of
antennas. Thus, there is often a preferred gain measurement technique defined
by the standard you are working to. In regard to what you told us, what is 2D
& 3D (dimension) gain? And what is peak gain? What standard is defining these
terms? Ed Price
WB6WSN
Chula Vista, CA USA From: Stephen Whalen [mailto:[email protected]]
Sent: Friday, July 01, 2016 8:01 AM
To: [email protected]
Subject: [PSES] Antenna gain measurement standard Greetings, Does anyone know
which standard is used for measuring antenna gain? Are 3D antenna gain
measurements typically different than 2D with regards to peak gain? If so,
what's typical delta, 0.5dB or less? Regards, Stephen -
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