[SI-LIST] Re: Asymmetric Coupled Stripline

Ken-

I would call "asymmetric coupled stripline" a topology
where a pair of edge coupled stripline conductors are
placed asymmetrically with respect to the upper and lower
ground planes (i.e. the coupled pair is closer to one
plane than the other). 

I guess the term could also apply to broadside coupled pairs 
placed asymmetrically between planes, since the term 'coupled' 
is generic and doesn't identify either edge or broadside 
configurations, though with the lack of a specific qualifier 
it is usually interpreted to mean edge-coupled.

since you didn't specify that the pairs (either edge or broadside
coupled) were placed asymmetrically with respect to the planes
I am assumming they were placed symmetrically. If so, I'm not sure 
what the topology you have described would be termed, but it doesn't 
seem to fit the definition of asymmetric coupled stripline.

I don't think I've helped by telling you what the structure
is, but perhaps by identifying what it is not :)

-Ray Anderson
Sun Microsystems Inc.



>
>Hello Si List,
>Does the term "asymmetric coupled stripline" mean anything to anyone?
>
>The structure in question consists of
>-- a solid copper layer
>-- edge coupled pair with coplanar ground tracks on the outsides
>-- another identical edge coupled pair with coplanar ground tracks on the 
>outsides, right above the first pair as if broadside coupled
>-- solid copper layer
>
>I have come across this configuration twice during this week. Once, the 
>track pairs were connected at each end (upper "left" to lower "left", etc.) 
>and in the second case the pairs are not connected at all.
>
>I realize this is half a question but if anyone recognizes anything here, 
>or has the time and energy to speculate, I'll be grateful to receive your 
>input on or off list.
>
>Many thanks for reading,
>Ken
>
>Ken Taylor
>Polar Instruments, Inc.
>ken.taylor@xxxxxxxxxxxxxxxxxxxx

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