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Microwave and Radar Engineering by Gottapu Sasibhushana Rao

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5

Waveguides

5.1 INTRODUCTION

In Chapter 4, we explained the two conductor structures, usually referred to as transmission lines, which can support a transverse electromagnetic (TEM) mode of propagation. The electric and magnetic fields of TEM waves have only transverse components; that is, in the direction of propagation, Ez = Hz = 0. Coaxial cables, parallel plates, and two-wire lines are examples of practical transmission lines. This chapter investigates a special form of transmission line known as a waveguide. In general, the term waveguide is applied to structures consisting of a single conductor. Unlike the two-conductor structures, the single-conductor structures cannot support a TEM mode. A waveguide is just a hollow metallic tube that ...

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