A re-entrant cavity for measurement of complex permeability in the very-high-frequency region
R.D. Harrington, Ronald Powell, P. Haas · Journal of research of the National Bureau of Standards · 1956
Are-ent r ant.cavity, cons~ructe d for meas ~ring .t h e initial co mplex per meability of magnetlC torolds III the very-~lgh-fre9uency region, IS described.Many of t he e lectrical and ,rnechamcal problems assOCIated wIth t he.development of an instrument of t his type are ?ons.ld ered.The gen eral t ~eo ry of p el:meablhty.mea sllremel?ts, using ~ re-~ntrant c!l:vity, IS discussed, and t he assOCIated workmg eq uatIOns are d enved.CahbratlOn techmques an d results of measurements on several samples are also given.