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Microwave and Radar Engineering by Gottapu Sasibhushana Rao

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4

Introduction to Microwave Engineering

4.1 INTRODUCTION

In communication engineering, a signal occupies a finite bandwidth. For transmitting information from one place to another, a carrier frequency has to be modulated by the information to be carried, and, thus, sidebands will be produced. The resulting modulated signal occupies a certain amount of bandwidth in the RF spectrum. In addition, carrier frequencies have to be selected in such a way that they do not interfere with adjacent channel frequencies. Nowadays, the number of RF channels has been dramatically increased, and the spectrum has become extremely congested. The data transmission rate and frequency band are directly related. With increase in frequencies the channel capacity increases ...

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