FreeLists / si-list / [SI-LIST] Re: Question on EMI radiated power

[Scott McMorrow <scott@xxxxxxxxxxxxx>]

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:
>http://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:     
>               http://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:
http://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:     
                http://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