Study of Variations in the Reflection of Electromagnetic Waves from Foam Structures and their Dielectric Permittivity

Abstract

The review presents results of experimental studies in the range from 2 to 8.6 GHz of the dielectric properties of foam samples in the solid state. The results of experimental studies of variations in the dielectric properties of dispersed media in the form of samples of liquid water foam in wide bands of the microwave range are presented: 1). 2.5–3.5, 2), 5.6–8.3 and 3). 8-12 GHz. The results of multi-frequency measurement methods in the open space of reflection of electromagnetic waves in the range 17.4 - 25.9 GHz from a layer of water foam located on a metal substrate are reflected. The method of synthesizing the envelope of a radio pulse signal was used according to the measurement of the reflection coefficient. Shown are the variations in the relative dielectric pemability of the foam depending on the foaming ratio and time of existence.