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???
03/14/07 05:29
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 		 #134935 - I think it's a loop, not so much a slot antenna
Responding to: ???'s previous message
Joseph said:
Is it my imagination, or does that layout look dangerously similar to a slot antenna?

That was my first idea too, when I saw this picture for the first time.

But a slot antenna, if I have understood it properly, would mean, that the slot radiates itself, even without the signal trace running over the board, which does not seem to be the case here. Without the signal trace the radiation is negligible. Only when the signal trace is running over the slot and is driven by the 74HC00, the radiation is high. So, this would mean that actually a loop is formed by the signal trace and its ground return current over the (non-solid!) ground plane. What do you think?

Joseph said:
In any case, clearly power planes will do wonders for your EMC.

Absolutely! I'm glad to see, that you also recommend the use of a solid ground plane, even the use of power planes!

Kai

List of 81 messages in thread
TopicAuthorDate
new PCB software wanted            01/01/70 00:00      
   If that is the case be happy, the more jumpe            01/01/70 00:00      
   Mike, when will you...            01/01/70 00:00      
      It isn't me            01/01/70 00:00      
         Four layer boards??            01/01/70 00:00      
            The only you get is a circuit >somwhat working<            01/01/70 00:00      
               sure, but he does not want to 'design' he wants to            01/01/70 00:00      
                  Connect A to B            01/01/70 00:00      
                     naah            01/01/70 00:00      
               are you sure you're not overstating your case?            01/01/70 00:00      
                  EMC issues            01/01/70 00:00      
                  As sure as one can be...            01/01/70 00:00      
                     All my commercial wire-wrap boards had 'em            01/01/70 00:00      
                        by Dr Howard Johnson and the like            01/01/70 00:00      
                           I don't think so ...            01/01/70 00:00      
                              so you DO think so            01/01/70 00:00      
                                 Well, yes and no ...            01/01/70 00:00      
                                    true, but how often have we seen            01/01/70 00:00      
                                       you can't FIX everything            01/01/70 00:00      
                                          not a word about lying            01/01/70 00:00      
                                             That would be a mistake            01/01/70 00:00      
                                                qualities often lacking            01/01/70 00:00      
                                                   Yes, and that's where the real lesson lies.            01/01/70 00:00      
                        Almost total agree...            01/01/70 00:00      
                           I don't think we entirely disagree, Kai ...            01/01/70 00:00      
                              Yes, less and less entire disagree...            01/01/70 00:00      
                     Slot antenna            01/01/70 00:00      
                        I think it's a loop, not so much a slot antenna            01/01/70 00:00      
                           Slot antennae            01/01/70 00:00      
                              Exactly!            01/01/70 00:00      
   "Target"            01/01/70 00:00      
      Free Target?            01/01/70 00:00      
         Identical            01/01/70 00:00      
            I found 1/2 the answer            01/01/70 00:00      
               why library for LCD?            01/01/70 00:00      
                  It doesn\'t require a library, just a decent editor            01/01/70 00:00      
               ??            01/01/70 00:00      
               In many respects, bEagle is probably the WORST            01/01/70 00:00      
                  I don't like Eagle either! It's not professional!            01/01/70 00:00      
                  hmm            01/01/70 00:00      
                     You may want to go back and read the comments            01/01/70 00:00      
                        I have given up to help Mike...            01/01/70 00:00      
                           I'm not stuck to eagle            01/01/70 00:00      
                              I would try to get a second hand win98 PC            01/01/70 00:00      
                                 He hasn't searched for drivers yet.            01/01/70 00:00      
                                    Not necessarily true...            01/01/70 00:00      
                                       not necessarily, but very likely            01/01/70 00:00      
                              You guys must like microsoft alot            01/01/70 00:00      
                                 ... and you're sure it doesn't emulate a laserjet?            01/01/70 00:00      
                                    stabile and relialbe ?!            01/01/70 00:00      
                                       Well the OS (XP in this case) doesn't type well            01/01/70 00:00      
                                          Stability            01/01/70 00:00      
                                             if it ain't broken...            01/01/70 00:00      
            Not Identical            01/01/70 00:00      
               Huh?            01/01/70 00:00      
                  Looks to me like it is just for hobby or            01/01/70 00:00      
                     What is your manufacturer?            01/01/70 00:00      
                        Sunstone Circuits            01/01/70 00:00      
                           Thanks            01/01/70 00:00      
               Identical refering to operation, of course!            01/01/70 00:00      
                  No, but            01/01/70 00:00      
                     much of?            01/01/70 00:00      
                        One thing he finally accepted ...            01/01/70 00:00      
         Ah, thanks :)            01/01/70 00:00      
      Wrong windows            01/01/70 00:00      
   See my other post...            01/01/70 00:00      
   see my pcb tutorial link in chat forum            01/01/70 00:00      
      What about the associated software?            01/01/70 00:00      
         No direct output            01/01/70 00:00      
         haven't tried it            01/01/70 00:00      
   There's a learning curve with any package            01/01/70 00:00      
      Link?            01/01/70 00:00      
         maybe that's why it still exists            01/01/70 00:00      
      Running on a Windoze box?            01/01/70 00:00      
         It works best on a DOS-box            01/01/70 00:00      
      without commenting on he wisdom            01/01/70 00:00      
         The DOS-OrCAD files import into Capture            01/01/70 00:00      
   Links to other Schematic/Layout software            01/01/70 00:00      
   A Guy in England            01/01/70 00:00      
   pcb software            01/01/70 00:00      
      PCB123            01/01/70 00:00      

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