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Re: microwave, RF heating

At 2:37 PM -0500 5/29/00, Doug Craigen wrote:

(Field and Wave Electromagnetics - 2nd Ed - by Cheng) and
opened to the part on skin depth (p. 371). There I found a table
listing skin depths at various frequencies for various substances -
including seawater.

Seawater:
conductivity: 4 S/m
skin depth at 60 Hz: 32 m
skin depth at 1 MHz: 0.25 m
skin depth at 1 GHz: not given because at 1 GHz "seawater is
not a good
conductor" so the model breaks down.


Could this mean that seawater becomes 'reflective' at these frequencies???

or does the 'not a good conductor' phrase rule this out????

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