[SI-LIST] Re: coupling calculations
- From: "Han, Guobing" <han.guobing@xxxxxxxxx>
- To: colin_warwick@xxxxxxxxxxx
- Date: Tue, 3 Nov 2009 14:45:36 +0800
Btw, if you have more confidence and the substrate is pure, such as
only air, you can try to get the results directly based on conformal
mapping. :)
2009/11/3, Han, Guobing <han.guobing@xxxxxxxxx>:
> Hi Craig,
>
> I have a idea. First, deriative the solution for two conductor
> based on conformal mapping . Then, try to solve the four conductor
> problem based on array theroy, that is, from [Z]4*4 to [Z]8*8.
>
> How do you think of it?
>
> Best wishes and good luck!
>
> Thanks,
> Guobing
>
>
>
> 2009/10/20, colin_warwick@xxxxxxxxxxx <colin_warwick@xxxxxxxxxxx>:
>> Hi Craig,
>>
>> Sorry I don't have an answer, but I do have a question: Is your heart set
>> on
>> an analytical expression, or would you settle for scripting a 2D field
>> solver to give you plots of coupling versus geometry?
>>
>> -- Colin Warwick
>> Signal Integrity Product Marketing Manager, Agilent EEsof EDA
>> Blog: http://signal-integrity.tm.agilent.com
>>
>> -----Original Message-----
>> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>> On
>> Behalf Of Deibele, Craig Edmond
>> Sent: Tuesday, October 20, 2009 9:27 AM
>> To: si-list@xxxxxxxxxxxxx
>> Subject: [SI-LIST] coupling calculations
>>
>> hi everyone,
>> I have a scenario where I have four conductors enclosed inside of a tube
>> and
>> they are used as a coupled transmission line. I know what the
>> characteristic
>> impedance is of the sum mode, the two dipole modes, and of the quadripole
>> mode.
>>
>> I've seen the equations for two coupled conductors (like for edge coupled
>> microstrip/stripline or for broadside coupled transmission lines) and for
>> the coupling (i.e. C *log( (Ze-Zo)/(Ze+Zo) )
>>
>> I've gone through some of the math to extend the theory for 4 coupled
>> conductor transmission lines. I'd have expected that this be done
>> already,
>> but haven't found any references.
>>
>> Any ideas or can anyone point me at a good reference?
>>
>> Thanks
>>
>> Craig deibele
>>
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>
--
Guobing HAN,
Senior Signal Integrity Engineer,
Marvell Shanghai Ltd.
4F,Building4,399 Keyuan RD,Shanghai 201203, China
Email: gbhan@xxxxxxxxxxx
Office: 86-21-61094805
Mobile: 86-13818903075
MSN: han_guobing@xxxxxxxxxxx
Web site: http://www.marvell.com
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