Ultra Wideband Antennas

2General Concepts of Antennas

Contents

2.1 Introduction

2.2 Classical Narrowband Antennas

2.2.1 Wire antennas

2.2.1.1 Dipole

2.2.1.2 Hertzian monopole

2.2.1.3 Loop antennas

2.2.2 Aperture antennas

2.2.3 Reflectors

2.2.4 Microstrip antennas

2.2.5 Antenna arrays

2.2.5.1 Yagi–Uda

2.3 Feed-Point

2.4 Gain and Directivity

2.5 Radiation Pattern Concept

2.6 Polarization

2.7 Impedance

2.8 Reflection Coefficient

2.9 Quality Factor

2.10 Bandwidth

Bibliography

2.1 Introduction

In this chapter some general concepts associated with antennas are introduced. These concepts are valid for both narrowband and non-narrowband antennas. It is not the objective of this book, however, to present a detailed theory in the field of antennas. A wide variety of excellent ...