title: Zero loss magnetic metamaterials using powered active unit cells.
abstract: We report the design and experimental measurement of a powered active magnetic metamaterial with tunable permeability. The unit cell is based on the combination of an embedded radiofrequency amplifier and a tunable phase shifter, which together control the response of the medium. The measurements show that a negative permeability metamaterial with zero loss or even gain can be achieved through an array of such metamaterial cells. This kind of active metamaterial can find use in applications that are performance limited due to material losses.
authors.affiliation: Center for Metamaterials and Integrated Plasmonics and Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA. yuyuan.06@gmail.com
authors.forename: Yu
authors.initials: Y
authors.lastname: Yuan
authors.forename: Bogdan-Ioan
authors.initials: BI
authors.lastname: Popa
authors.forename: Steven A
authors.initials: SA
authors.lastname: Cummer