Printed tunable frequency selective surface on a developed flexible functionalized ceramic-polymer based substrate

In this work, we demonstrate the development of a flexible, high-dielectric-constant substrate based on barium strontium titanate (BST)/thermoplastic cyclic olefin copolymer (COC) nanocomposites suitable for fully printable phased array applications. This functionalized BST/COC substrate is demonstrated to possess tunability as a function of an applied DC bias. This tunable substrate is implemented for a tunable frequency selective surface in the X-band frequency range.