CONTENTS

Policy on Intellectual Property Right (IPR)
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
a)���� Smooth terrain
b)���� Isolated obstacles
c)���� Rolling 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 any distance at 10 MHz and above
�4���� Diffraction over isolated obstacles or a general terrestrial path
������� 4.1���� Single knife-edge obstacle
������� 4.2���� Single rounded obstacle
������� 4.3���� Double isolated edges
������� 4.4���� Multiple isolated cylinders
������� 4.5���� Method for a general terrestrial path
����������������� 4.5.1���� Bullington model
Case 1. Path is LoS
Case 2. Path is trans-horizon
����������������� 4.5.2���� Complete 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
Attachment 1� to Annex 1� Calculation of cylinder parameters
�1���� Diffraction angle and position of vertex
�2���� Cylinder parameters
Attachment 2� to Annex 1� Sub-path diffraction losses
�1���� Introduction
�2���� Method