BMFO-PVDF electrospun fiber based tunable metamaterial structures for electromagnetic interference shielding in microwave frequency region

¹ New Horizon College of Engineering, 560103 Bangalore, India
² Microwave Laboratory, Department of Physics, IIT Madras, 600036 Chennai, India
³ SRM University, Kattankulathur, 603203 Chennai, India

^a e-mail: manianvs@iitm.ac.in

Received: 19 July 2015
Revised: 24 September 2015
Accepted: 28 September 2015
Published online: 3 November 2015

Abstract

Metamaterial structures are artificial structures that are useful in controlling the flow of electromagnetic radiation. In this paper, composite fibers of sub-micron thickness of barium substituted magnesium ferrite (Ba_0.2Mg_0.8Fe₂O₄) – polyvinylidene fluoride obtained by electrospinning is used as a substrate to design electromagnetic interference shielding structures. While electrospinning improves the ferroelectric properties of the polyvinylidene fluoride, the presence of barium magnesium ferrite modifies the magnetic property of the composite fiber. The dielectric and magnetic properties at microwave frequency measured using microwave cavity perturbation technique are used to design the reflection as well as absorption based tunable metamaterial structures for electromagnetic interference shielding in microwave frequency region. For one of the structures, the simulation indicates that single negative metamaterial structure becomes a double negative metamaterial under the external magnetic field.