The Use of Ferrites at Microwave Frequencies - 1st Edition - ISBN: 9780080137971, 9781483164557

The Use of Ferrites at Microwave Frequencies

1st Edition

International Series of Monographs on Electronics and Instrumentation

Authors: L. Thourel
eBook ISBN: 9781483164557
Imprint: Pergamon
Published Date: 1st January 1964
Page Count: 110
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The Use of Ferrites at Microwave Frequencies describes the applications of ferrites at microwave frequencies and the apparatus involved. Topics covered range from the properties of ferrites to gyromagnetic and non-reciprocal effects, ferrite isolators, circulators, and modulators. The use of ferrites in variable frequency filter cavities is also discussed. Mathematical explanations are reduced to the strict minimum and only the results of calculations are indicated.
This book consists of seven chapters and opens with a review of the theory of magnetism, touching on subjects such as the BOHR magneton, diamagnetism and paramagnetism, ferromagnetism and antiferromagnetism, ferrimagnetism, and demagnetizing. The next chapter deals with the elementary theory of gyromagnetic effects and covers the kinetic moment theorem, precession of the spin moment, gyromagnetic resonance, complex permeability, and gyromagnetic effects in the atom. The reader is then introduced to ferrites and their properties; non-reciprocal effects and their applications; and ferrite isolators, circulators, and modulators. The final chapter describes the use of ferrites in the design of cavities whose resonant frequency is controlled by a magnetic field or filters with variable characteristics. This monograph is written primarily for microwave and electronics engineers.

Table of Contents


Chapter I. A Review of the Theory of Magnetism

I.1 Definitions

I.2 The Bohr Magneton

I.3 Diamagnetism and Paramagnetism

I.4 Ferromagnetism

I.5 Ferromagnetic Crystals. Energy of Anisotropy

I.6 Antiferromagnetism

I.7 Ferrimagnetism

I.8 Demagnetizing Fields

Chapter II. Elementary Theory of Gyromagnetic Effects

II.1 The Kinetic Moment Theorem

II.2 Precession of the Spin Moment

II.3 Gyromagnetic Resonance

II.4 Complex Permeability

II.5 Gyromagnetic Effects in the Atom

Chapter III. Ferrites and Their Properties

III.1 Definition of a Ferrite

III.2 Gyromagnetic Resonance in Ferrites

III.3 The Effect of Shape. Kittel's Formula

III.4 Effect of Frequency

III.5 Effect of Temperature

III.6 Effect of High Frequency Power

III.7 Principal Types of Ferrites and Their Properties

III.8 Garnets

Chapter IV. Non-Reciprocal Effects and Their Applications

IV.1 Absorption at Resonance

IV.2 Non-Reciprocal Phase-Shift

IV.3 Faraday Effect

IV.4 Field Displacement Effect

Chapter V. Ferrite Isolators

V.1 Resonance Isolators

V.2 Isolators Using the Faraday Effect

V.3 Field Displacement Isolators

V.4 Coaxial Line Isolators

Chapter VI. Circulators and Modulators

VI.1 Definition of a Circulator

VI.2 The Use of Differential Phase Shifting

VI.3 Circulators Using the Faraday Effect

VI.4 Use of Field Displacement

VI.5 Commutators

VI.6 Modulators

VI.7 Single Side Band Modulators

Chapter VII. The Use of Ferrites in Variable Frequency Filter Cavities

VII.1 Introduction

VII.2 Cavities in Rectangular Guide

VII.3 Reciprocal Band-Pass or Band-Stop Filters

VII.4 Non-Reciprocal Filters

VII.5 Variable Frequency High-Pass Filters

VII.6 Conclusion




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L. Thourel

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