Table of Contents

Preface ix

1 Architecture of Symmetrical Waveguide Junction Circulators 1

2 Scattering Matrix of m-Port Circulator 23

3 Eigenvalue Adjustment pf 3-Port Circulator 39

4 Impedance Matrix of Junction Circulator 57

5 The Post Gyromagnetic Resonator 77

6 Okada Resonator 89

7 Isotropic, Anisotropic and Gyromagnetic Circular Waveguides 109

8 Isotropic, Anisotropic Open Circular Wavelengths 139

9 The Dialectric Cavity Resonator 155

10 The Gyromagnetic Cavity Resonator 179

11 Impedance in Rectangular, Ridge and Radial Waveguides 199

12 Junction Circular Using Post Resonators 229

13 Complex Gyrator Circuit of a Waveguide Junction Circulator using an Okada Resonator 255

14 Degree-1 and 2 Okada Circulators 279

15 An Evanescent Mode Okada Junction Circulator 297

16 Complex Gyrator Circuit of an H-Plane Junction Circulator using an Okada Resonator 311

17 Complex Gyrator Circuit of an Evanescent-Mode E-Plane Junction Circulator using H-Plane Turnstile Resonators 339

18 Waveguide Circulators using Triangular and Prism Resonators 359

19 Synthesis of Quarter-Wave Coupled Junction Circulators with Degrees 1 and 2 Complex Gyrator Circuits 379

20 The 4-Port Single Junction Waveguide Circulator 399

21 Microwave Switching using Junction Circulators 431

22 Insertion Loss of Waveguide Circulators 431

23 Synthesis of Stepped Impedance Transducers 445

24 Experimental Evaluation of Junction Circulators 471

25 Circulator Specifications 489

26 Gyromagnetic Effect in Magnetic Insulator 511

Index 537

About the Author

Joseph Helszajn,, PhD, is an international authority on non-reciprocal microwave circuits and devices. He has made a significant contribution to the characterization of the complex gyrator circuits and gain-bandwidth products of planar gyromagnetic resonators and other gyromagnetic devices. Professor Helszajn is a Fellow of the Institute of Electrical and Electronic Engineers, the City and Guilds Institute, the Royal Society of Edinburgh and the Royal Academy of Engineering. He previously authored thirteen books, nine of which were published by Wiley.