ITU-R P.2040-4 (09/2025)

Recommendation ITU-R P.2040-4
Policy on Intellectual Property Right (IPR)
Annex
1 Introduction
2 Basic principles and theory
2.1 Theory of material electrical properties
2.1.1 Introduction
2.1.2 Method
2.1.3 Frequency dependence of material properties
2.1.4 Models of material properties frequency dependence
2.2 Effects of material structure on radio-wave propagation
2.2.1 Plane wave reflection and transmission at a single planar interface
2.2.2 Plane wave reflection and transmission for a single- or multi-layer slab
2.2.3 Waveguide propagation in buildings
2.3 Theory and results for frequency selective surface materials
2.3.1 Frequency selective surfaces
2.3.2 Theory for wave propagation around the surface of round convexity array
2.3.3 Calculation results
2.3.4 Measurement
3 Compilations of electrical properties of materials
Attachment 1 to Annex 1 Alternative method to obtain reflection and transmission coefficients for building materials represented by N dielectric slabs based on ABCD matrix formulation

This Recommendation provides guidance on the effects of building materials and structures on radio-wave propagation in the range of 1 MHz to 450 GHz.