Study of electromagnetic waves reflection from foam samples and determination of their dielectric permeativity

Abstract

Reflectivity and dielectric permeativity of liquid foam structures with an initial foaming ratio of 55 units in the form of flat-layered foam samples with fixed thicknesses of 40 and 80 mm are under measurement. A multi-frequency technique for studying the foam samples is used. The measuring and computing complex operates in the microwave range from 38 to 52 GHz. It is shown that the foam structure reduces the reflection of electromagnetic waves from metal surfaces significantly. The obtained value of the dielectric permeativity of the foam samples is in the range from 1.08 to 1.26. The results are useful for studying the reflection characteristics offoams and help to determine their dielectric permeativity.