Mn-Zn Ferrites' Dimension-Independent Permeability and Permittivity: Theoretical and Experimental Investigation of Measurement Methods

Mn-Zn ferrites have wide applications in industry. Since the early history of Mn-Zn ferrites, it has been found that combination of high permeability (¿) and high permittivity (¿) of Mn-Zn ferrites may cause dimensional effects in Mn-Zn ferrite-core-based magnetic devices to deteriorate the performance above a few hundred kHz. Both ¿ and ¿ are critical parameters for performance examination and optimization of those magnetic devices when the size of the ferrite core is comparable to the wavelength in the core. However, the Mn-Zn ferrites' ¿ and ¿ measured by using conventional methods are dimension-dependent due to dimensional effects, thus different from the intrinsic, or dimensional-independent, values. In this book, the methods are investigated theoretically and experimentally to determine Mn-Zn ferrites' dimension-independent ¿ and ¿. The book should help to understand dimensional effects, and to shed a light on the principle and the technique to determine Mn-Zn ferrites' dimension-independent ¿ and ¿, and should be useful to students, engineers and researchers in materials science and electrical engineering who are working in the areas related to Mn-Zn ferrites.