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# [Does injecting current change the indutanc and resistance values ?]

- To: femm@yahoogroups.com
- Subject: [Does injecting current change the indutanc and resistance values ?]
- From: "you se-ho" <sxy28@hotmail.com>
- Date: Sun, 18 Nov 2001 08:25:08
- Bcc:

`
To Dear Dr. Meeker and everyone:`
`How are you? I played with usual two-traces and ground system. My thought was since transmission line parameters (R,L and C etc) depends only on transmission line's material and dimension, R and L should be same regardless of how I inject currents. However, the nature always makes me surprise. I did not get same result. What I did was I divided the conductor into 3 pieces. In other words, 100 micrometer conductor into 30-40-30 micrometers with same conductivity, only give current (excitation) to the middle part. In one hand, I still believe what I thought above, in other hand, I believe what I saw considering diffusion equation that FEMM solves does not dictate how to inject current into system. Then most reasonable way to inject is to inject current uniformly throughout the conductor. I start to play with this because multiconductor system simulation (and corsstalk evaluation) will be difficult if the different injection of current gives different results.`

    Any comments will be appreciated.
    Sincerely,
    SE-HO YOU

`(ps) When I put the +1A for two traces and -1A for ground, the total current in the traces are not +1A (becoming less than +1A) as frequency increases with the set-up above. When I inject the current +1A throughout the traces and -1A for for ground by circuit property (without splitting conductor 3 pieces), it always turns out +1A and -1A regardless of freqeuncy.`
``
``

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