[SI-LIST] Re: Question on EMI radiated power
- From: "Andrew Burnside" <Andrew.Burnside@xxxxxxxxxxxxxxxxxxx>
- To: <doug@xxxxxxxxxx>
- Date: Fri, 4 Nov 2005 08:57:18 -0000
The complex radiation impedance will also vary depending on what part of the
circuit you are considering, and the position. Therefore, if you are interested
in the near field you end up with a finite element model.
If you are interested with modelling gross emissions from parts, e.g. with a
macro-model, then you might want to have a look at ICEM. This does for the
power supply network what IBIS does for I/O.
Regards
Andrew
________________________________
From: si-list-bounce@xxxxxxxxxxxxx on behalf of Scott McMorrow
Sent: Thu 03/11/2005 22:46
To: doug@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Question on EMI radiated power
Doug
In short, the answer is no.
Radiation resistance works with antennas, since they are generally
narrow band and are efficient over a narrow frequency range. A
decomposition to a RR formulation only works over a narrow frequency
band. For broadband structures, radiated power is dependent upon
frequency, which is a complex impedance. If you replace radiation
resistance with the complex radiation impedance, then you could use it
to describe radiation loss.
regards,
scott
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
Teraspeed® is the registered service mark of
Teraspeed Consulting Group LLC
Doug Brooks wrote:
>SI Gurus
>
>I'd like to try something on you. Consider a circuit that radiates
>some EMI (not necessarily a lot.)
>
>Point #1. Presumably, there is energy radiated in the EMI that is
>lost to the circuit. It might be very small, but still non-zero.
>
>Point #2. In an antenna, energy that is radiated from the antenna
>can be represented by the Radiation Resistance (RR) of the antenna.
>That is, the energy radiated is equivalent to the energy dissipated
>in the equivalent RR.
>
>Therefore...... Can we assume that in a circuit that radiates EMI
>there is an equivalent loss of energy in the circuit? And further can
>we assume, at least conceptually, that we could define something
>"like" an RR for a circuit to represent that loss to EMI?
>
>Doug Brooks
>
>____________________________________________________________________________-
>Check out UltraCAD's new presentation videos and new skin effect
>calculator at http://www.ultracad.com
>
>------------------------------------------------------------------
>To unsubscribe from si-list:
>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
>or to administer your membership from a web page, go to:
>//www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>List FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
> http://www.si-list.org
>
>List archives are viewable at:
> //www.freelists.org/archives/si-list
>or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
>Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
