Magnetic metal cladding gives better attenuation in small waveguides operating at high microwave frequencies than nonmagnetic metals

Livesey, K. L.; Camley, R. E.
June 2010
Applied Physics Letters;6/21/2010, Vol. 96 Issue 25, p252506
Academic Journal
We calculate the attenuation in microwave waveguides comprising a thin film of dielectric SiO2 sandwiched by copper or iron films. We show that in a frequency range between roughly 63 and 73 GHz, using iron gives lower losses by up to 7.5 dB/cm compared with copper. This is in the region of so-called antiresonance where the effective skin depth of ferromagnetic iron diverges.


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