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Annex 1
1    Introduction
2    Basic concepts
       2.1    Fresnel ellipsoids and Fresnel zones
       2.2    Penumbra width
       2.3    Diffraction zone
       2.4    Obstacle surface smoothness criterion
       2.5    Isolated obstacle
       2.6    Types of terrain
       2.7    Fresnel integrals
3    Diffraction over a spherical Earth
       3.1    Diffraction loss for over-the-horizon paths
                 3.1.1    Numerical calculation
                 3.1.2    Calculation by nomograms
       3.2    Diffraction loss for LoS paths with sub-path diffraction
4    Diffraction over isolated obstacles
       4.1    Single knife-edge obstacle
       4.2    Single rounded obstacle
       4.3    Double isolated edges
       4.4    Multiple isolated obstacles
                 4.4.1    Cascaded cylinder method
                 4.4.2      Cascaded knife edge method
5    Diffraction by thin screens
      5.1      Finite-width screen
       5.2    Diffraction by rectangular apertures and composite apertures or screens
                 5.2.1    Diffraction by a single rectangular aperture
                 5.2.2    Diffraction by composite apertures or screens
6    Diffraction over a finitely conducting wedge
7    Guide to propagation by diffraction
Appendix 1 to Annex 1 Calculation of cylinder parameters
1    Diffraction angle and position of vertex
2    Cylinder parameters
Appendix 2 to Annex 1 Sub-path diffraction losses
1    Introduction
2    Method

CONTENTS