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

A highly sensitive method for measuring μ'
±
- jμ''
±
of ferrites far from the ferrimagnetic resonance region is proposed which makes use of the resonance splitting of counter-rotating TE
11
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
Q
are large enough to enable μ'
±
- jμ''
±
, in particular μ''
±
, to be measured to a maximum sensitivity of about 5 × 10
^-5
.