title: Enhancement of current density by dc electric concentrator.
abstract: We investigate a dc electric concentrator for steady current fields theoretically and experimentally. Based on the transformation electrostatics, we show that the dc concentrator can focus electric currents into the central concentrated region and enhance the electric field and current density. Outside the concentrator, the current lines are distributed as the same as those in a homogeneous conducting material. Hence, such a dc electric concentrator has no impact on other external devices. Using the analogy between electrically conducting materials and resistor networks, we design, fabricate, and test a dc concentrator using the circuit theory. The measured results agree very well with the theoretical predictions and numerical simulations, demonstrating the perfect concentrating performance.
authors.affiliation: State Key Laboratory of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing 210096, PR China.
authors.forename: Wei Xiang
authors.initials: WX
authors.lastname: Jiang
authors.forename: Chen Yang
authors.initials: CY
authors.lastname: Luo
authors.forename: Hui Feng
authors.initials: HF
authors.lastname: Ma
authors.forename: Zhong Lei
authors.initials: ZL
authors.lastname: Mei
authors.forename: Tie Jun
authors.initials: TJ
authors.lastname: Cui