Talk:Microstrip

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[edit] Resistivity Relevance

I dont think conductor resistivity has that much effect of the propagation down a microstrip. Not as much as its inductance for instance. Does anyone want to discuss this statement?? Light current 20:59, 24 August 2005 (UTC)

Agreed - but the article only says that the line has "specific electrical properties". If it's talking about the loss per unit length (rather than the characteristic impedance), then this does depend on the resistivity. Perhaps stating that something 'has properties', without saying what they are, is a bit too vague?catslash 14:03, 10 August 2006 (UTC)

[edit] Differential Traces

I appreciate very much having post the formula for microstrip. The PCB prototype shop where I work, now uses it in a tool that generates the layer-stack-up document that eventually goest to the manufacturing floor. If there is any interest we may furnish de VB6 source code version of the formula.

I request your advice for directions for where to find the formulas for Surface-Differential-Trace Impedance and Offset-Differential-Trace (internal)

Thanks again.
--Legarcia.sp 17:29, 8 November 2006 (UTC)

Sorry: I don't fully understand; are the differential traces next to each other on the same surface of the substrate (co-planar strips)? and with a ground plane (coupled microstrips)? or are they facing each other on opposite surfaces of the substrate? And the Offset-Differential-Trace (internal); is it like this [1]? --catslash 15:22, 9 November 2006 (UTC)

[edit] Bends

I disagree that a "large" portion of the signal would be reflected at a 90 degree bend.

"An abrupt 90° bend in a microstrip will cause a large portion of the signal on the strip to be reflected back towards it source, with only part of the signal transmitted on around the bend."

See the post here for an example of the effect of a bend:

http://circuitcalculator.com/wordpress/2007/04/06/effects-of-corners-in-pcb-traces/

OK - I will change it to "significant". I've posted my observations regarding the above link on that site. --catslash 18:12, 8 April 2007 (UTC)