Propagation of Radio WavesPDF电子书下载

CHAPTER ONE Basic Considerations in Radio Wave Propagation 1

1．Introduction 1

2．Propagation characteristics of radio waves in different frequency ranges 3

CHAPTER TWO Surface Wave Propagation 8

1．Introduction 8

2．Surface wave field intensity due to an elemental vertical dipole antenna 9

3．Wave tilt of the surface wave 15

4．Effects of Earth＇s curvature 17

CHAPTER THREE Space Wave Propagation 19

1．Introduction 19

2．Ground reflection coefficient 19

3．Effects of ground reflection 22

4．Effects of tropospheric refraction and absorption 25

5．Duct propagation 30

6．Effects of earth＇s curvature 32

CHAPTER FOUR Sky Wave Propagation 36

1．Introduction 36

2．Propagation of radio waves in an ionized atmosphere(in absence of magnetic field) 37

3．Effects of earth＇s magnetic field 42

4．Maximum usable frequency and skip distance 51

5．Calculation of M．U．F 52

6．Propagation of long waves 60

7．Sky-wave absorption 61

8．Lowest usable frequency 63

9．Ionospheric cross-modulation 64

CHAPTER FIVE The Ionosphere 67

1．Introduction 67

2．Chapman theory of layer formation 68

3．Structure and properties of different ionized regions 72

4．Tides and winds in the upper atmosphere 78

5．Ionospheric abnormalities 79

6．Ionospheric measurements 83

7．Ionospheric predictions 90

CHAPTER SIX Scatter Propagation 96

1．Introduction 96

2．Ionospheric scatter propagation 97

3．Tropospheric scatter propagation 100

4．Scattering from atmospheric precipitations 101

5．Long distance propagation of V．H．F．and U．H．E．signals through artificial satellites 104

Appendixes 107

Ⅰ．Appleton-Hartree Magneto-Ionic Formula 109

Ⅱ．Some Points for the Design of a Sky-Wave Communication Link 112

Index 115