In Fig.13.29, in the step from (c) to (d), the layer is stretched by lw/l, where l is the length in (c), equal to nl*h, and h is given in (13.70). Porosity is equal to the ratio of the areas, i.e. eta = l/lw, see (13.72)
Then, to keep the same dc resistance from (c) to (d), resistivity in (d) is increased by 1/eta. Finally, since skin depth (13.69) is proportional to square-root of resistivity, effective skin depth in (13.71) is increased by by 1/square-root(eta)
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In Fig.13.29, in the step from (c) to (d), the layer is stretched by lw/l, where l is the length in (c), equal to nl*h, and h is given in (13.70). Porosity is equal to the ratio of the areas, i.e. eta = l/lw, see (13.72)
Then, to keep the same dc resistance from (c) to (d), resistivity in (d) is increased by 1/eta. Finally, since skin depth (13.69) is proportional to square-root of resistivity, effective skin depth in (13.71) is increased by by 1/square-root(eta)
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