[SI-LIST] Re: Question
- From: Raymond Anderson <Raymond.Anderson@xxxxxxx>
- To: p2rich@xxxxxxxxxxxxx
- Date: Mon, 17 Nov 2003 12:11:25 -0800
Must be Monday!
If D=100 and d=10 (and Er=1) then
Z= (120/sqrtEr) * ln(100/10)
Z= 120*2.3= 276 ohms
If D=50 and d=10 then
Z = 120 * 1.6 = 193.1 ohms
So Z goes down as spacing gets smaller (as expected).
-Ray
Rich Peyton wrote:
>One of my notes states an equation for Parallel Wire Lines for transmission
>lines
>
>Z= (120/sqrtEr)*ln((2D)/d))
>
>Where D is spacing between wires
>d is diameter
>
>
>Am I missing something? If you decrease the spacing (D), It should decrease
>Impedance. When I use this formula it increases the Impedance.
>
>Does anyone have an impedance formula for annulus material instead of solid
>material?
>
>Maybe it's just Monday and I'm doing something wrong?
>
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