Microwave Absorption Properties Of Magnetic Perovskite/Epoxy Based Composites:A Predictive Approach

Abstract

Magnetic perovskite compounds have enhanced dielectric and magnetic properties thereby providing good microwave absorption properties with frequency tunability. Hence, in this work La based magnetic perovskite fillers are selected using theoretical model and tested further for their overall microwave absorption characteristics. The theoretical model used in the study utilizes polarization energy of individual elements as a base parameter and to predict compound formulation by applying the empirical balancing equation. If the selected elements satisfy the given equation, the predicted compound can show efficient microwave absorption. For the experimental analysis, the perovskite fillers are combined with epoxy resin to form composite samples which were then used to measure the reflection loss in a far field set up. The measured reflection loss was well above -20 dB for the selected compounds verifying the theoretical analysis. A shift towards in frequency from 8 to around 4 GHz was observed as the thickness for the sample is increased from mm to cm range. The samples have also shown high reflection loss on and around a certain frequency value suggesting a good frequency selection ability. The comprehensive study highlights the use of perovskites as an affordable and efficient alternative to carbon based microwave absorbers.