Voltage Controlled Intertwined Spiral Arrays for Reconfigurable Metasurfaces
Layout of array portion of sample free-standing bistate interwoven 9-fold bifilar spiral elements. The reference basic spirals in adjacent unit cells are alternatively marked dark and light grey to highlight the intertwining scheme. Two pin diodes are connected across breaks in the outer folds of the spiral conductors and the choke inductance is placed at the centre of each unit cell between the ends of disconnected spiral arms. Geometrical parameters of the unit cell: lattice period mm, spiral pitch 2.4 mm, and strip width mm and strip thickness 17.5 m.