《Propagation of Radio Waves》

CHAPTER ONE Basic Considerations in Radio Wave Propagation1

1．Introduction1

2．Propagation characteristics of radio waves in different frequency ranges3

CHAPTER TWO Surface Wave Propagation8

1．Introduction8

2．Surface wave field intensity due to an elemental vertical dipole antenna9

3．Wave tilt of the surface wave15

4．Effects of Earth＇s curvature17

CHAPTER THREE Space Wave Propagation19

1．Introduction19

2．Ground reflection coefficient19

3．Effects of ground reflection22

4．Effects of tropospheric refraction and absorption25

5．Duct propagation30

6．Effects of earth＇s curvature32

CHAPTER FOUR Sky Wave Propagation36

1．Introduction36

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

3．Effects of earth＇s magnetic field42

4．Maximum usable frequency and skip distance51

5．Calculation of M．U．F52

6．Propagation of long waves60

7．Sky-wave absorption61

8．Lowest usable frequency63

9．Ionospheric cross-modulation64

CHAPTER FIVE The Ionosphere67

1．Introduction67

2．Chapman theory of layer formation68

3．Structure and properties of different ionized regions72

4．Tides and winds in the upper atmosphere78

5．Ionospheric abnormalities79

6．Ionospheric measurements83

7．Ionospheric predictions90

CHAPTER SIX Scatter Propagation96

1．Introduction96

2．Ionospheric scatter propagation97

3．Tropospheric scatter propagation100

4．Scattering from atmospheric precipitations101

5．Long distance propagation of V．H．F．and U．H．E．signals through artificial satellites104

Appendixes107

Ⅰ．Appleton-Hartree Magneto-Ionic Formula109

Ⅱ．Some Points for the Design of a Sky-Wave Communication Link112

Index115