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TechNet E-Mail Forum <[log in to unmask]>, Inge <[log in to unmask]>
Date:
Fri, 31 Jul 2009 00:12:49 +0200
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As a little funny demo, go to this:

http://www.falstad.com/mathphysics.html

select 'Electrodynamics'
select Electromagnetic waves in a waveguide
Play with various frequencies and vary the TEM (wave mode)
and you will get a glimpse of the mystery of microwaves.

( I suppose many Technetters work daily with EM simulations, someone may 
have better illustrations, e.g. the charge transportation in a copper plane 
with various thickness, number of vias etc.)



Inge


----- Original Message ----- 
From: "Inge" <[log in to unmask]>
To: "TechNet E-Mail Forum" <[log in to unmask]>
Sent: Thursday, July 30, 2009 11:48 PM
Subject: Re: [TN] Hashing-Out Hatching


> Well, what was the conclusion of this discussion from start? As I'm pretty 
> involved in microwave design, but I could not find the red thread. One 
> cannot generalize about Faraday cages, vias, ground planes etc. The 
> behaviour of electromagnetic waves is a spectrum of possibilities. Can't 
> enough marvel when I see simulations of EM transportation through coax 
> lines, through dielectrics, through metals, how radiation can creep 
> unexpected ways despite metal shields, how ground planes suddenly works as 
> antennas etc. Working from Megawatts to nanowatts, from travelling wave 
> tubes to one-chip radar TRMs, you learn that this area differs a lot from 
> other fields in that common rules are not always practicable. So, what was 
> the come-out of the discussion. I am really curious.
>
> Inge
>
> ----- Original Message ----- 
> From: "Craig Cullum" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, July 30, 2009 4:32 PM
> Subject: Re: [TN] Hashing-Out Hatching
>
>
> Graham, you're probably going to start feeling that you are being dumped 
> on (smile).
> I regret to say that this is a practice we use here to better our chances 
> of
> passing emissions testing.
>
> Craig Cullum, Engineering Technologist, AMTELCO
> e: [log in to unmask]
>   [log in to unmask]
> f: 608 838 8367
> v: 608 838 4194, or 4197, x128
>
> Please visit us at www.amtelco.com
>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood
>> Sent: Thursday, July 30, 2009 9:03
>> To: [log in to unmask]
>> Subject: Re: [TN] Hashing-Out Hatching
>>
>> Actually that is the HDI method that is becoming more and more popular.
>> Via-in-pad, internal routing and external GND planes.
>> Ken
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
>> Sent: Thursday, July 30, 2009 9:58 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Hashing-Out Hatching
>>
>> Ha...  We had a designer at one time who thought that surface traces were
>> bad, very bad.  So every pad for every part had a short trace that
>> immediately went to a via and the signal was routed to an inner layer.
>> Seriously.  That guy needs your doctor...
>>
>> regards,
>>  - Graham Collins
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of James Head
>> Sent: Thursday, July 30, 2009 10:50 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Hashing-Out Hatching
>>
>> > Gary brought me back to the days when, just for kicks, I would take 
>> > other
>> > guy's designs and remove all of their vias, just to prove I could do 
>> > it.
>> I've
>> > gotten help, I'm cured, a thousand vias is nothing anymore.
>>
>> You should pass me the details of your doctor - I always spend a little
>> time
>> at the end of a project going through and trying to eliminate vias if I 
>> can
>> as I see everyone of them as a potential failure point - and it's very
>> satisfying to re-run the drill report and see the hole count drop!
>>
>> Mind you I'm not obsessive though.  I worked with one relatively
>> inexperienced PCB designer once who spent a whole week designing a power
>> and
>> deflection PCB for a televison and managed to do it all without any vias 
>> or
>> wire jumpers.  Unfortunately his design would never have worked with
>> segregation between the primary and secondary sides of the transformer 
>> and
>> 0.3 mm traces carrying high voltages and currents!
>>
>> James
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