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attenuation in RF region

Posted by Mart (B) on October 8, 2001 at 22:37:19

In Reply to: Re: to make a long story short ... posted by monk1 on October 8, 2001 at 12:23:23:

is due to skin-effect. You can witness the beginnings in some audio componenets in the audio spectrum. EG: I've measured the impedence of some conventional coils. Above 1kHz, the impedence still looks normal but inuductance is being replaced by resistance. You see, as the current migrates to the surface of the wire, less of the wire crossection is used. This increases the effective resistance. Simultaneously, while less current is drawn less magnetic field is created. So, the inductance is less. Thus, the magnitude of the impedence curve looks normal while the phase doesn't.

Obviously this skin effect increases with frequency until by the MHz region the resistance shelves the output & any remaining signal is smeared by the dielectric of the insolation. Hope this helps to see how my linear model breaks down outside it's design region? However, this does explain a lot. BTW, I still don't know why you can't download the zipped excel file which models a few lumped models with a 201th order model. Damn, I wish you could because I included Zobels across the amp & speaker for which you can expirament.

POLES: I don't see how using a Zobel adds a pole since it doesn't become a short that would zero the dominator, unlike my disc cap tweak the shorts out the couple of MHz region you witnessed doesn't conduct anyway.

... just my 2¢

» moderate Mart £ «

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