Highly sensitive procedures for measuring permeabilities (µ±) for circularly polarized fields in microwave ferrites

Abstract

A highly sensitive method for measuring μ' <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">±</inf> - jμ'' <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">±</inf> of ferrites far from the ferrimagnetic resonance region is proposed which makes use of the resonance splitting of counter-rotating TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> modes in the cylindrical metallic cavity resonator Filled with axially biased ferrite specimen. With a Filling factor of unity, both the frequency splitting and the change of reciprocal <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</tex> are large enough to enable μ' <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">±</inf> - jμ'' <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">±</inf> , in particular μ'' <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">±</inf> , to be measured to a maximum sensitivity of about 5 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-5</sup> .