[SI-LIST] Re: Radiation loss of microstrip
- From: DAVID CUTHBERT <telegrapher9@xxxxxxxxx>
- To: istvan.novak@xxxxxxxxxxx
- Date: Thu, 24 Apr 2014 07:12:02 -0600
A quick check with NEC using vacuum for the dielectric shows 0.1 dB of
radiation loss per inch for the 30 mil microstrip at 10 GHz. This is the
same as Fig. 3.
Dave Cuthbert
Rubidium Technology LLC
consulting on EMC, SI, PS, antenna, and everything analog
On Thu, Apr 24, 2014 at 5:33 AM, Istvan Novak <istvan.novak@xxxxxxxxxxx>wrote:
> Not sure why you would expect high radiation loss.
> Are you trying to design microstrip antennas or are
> you trying to analyze the loss of high-speed traces
> due to radiation? If this latter, keep in mind that in
> typical scenarios the main problem with trace
> radiation is not that it creates too much additional
> eye closure but the small fraction of signal escaping
> from the board might create radiation (EMC) problem.
>
> Regards,
>
> Istvan Novak
> Oracle
>
>
>
> On 4/24/2014 5:26 AM, Chris lee wrote:
> > Hi, Experts
> > I am investigating radiation loss of microstrip line for high speed
> digital
> > circuit. Read some documents, not found a solid source for this loss
> effect.
> >
> >
> http://www.ipcoutlook.org/pdf/insertion_loss_comparisons_pcb_constructions_ipc.pdf
> > This doc give a closed expression and some data for the radiation loss.
> > when the board with same stackup as the doc is simulated in HFSS with
> ideal
> > dielectric and conductor, the loss is below 1e-4. I doubt the radiation
> > loss data in this presentation.
> > Could some guru shed some light on this topic.
> > Is radiation loss a problem to consider for 50ohm micrstrip line(FR4 or
> > some low Dk dielectric) below frequency 30GHz? or it is a minor issue
> and
> > not neccessary to consider it.
> >
> > Thanks and Regards.
> >
> >
> >
> >
> >
> >
>
> ------------------------------------------------------------------
> 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 forum is accessible at:
> http://tech.groups.yahoo.com/group/si-list
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> 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 forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
