1. Unidirectional invisibility induced by parity-time symmetric circuit
- Author
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Bo Lv, Zhiming Liang, Rujiang Li, Xinhua Yin, Ruyu Ma, Bian Wu, Lei Gao, Qun Wu, Qingsheng Zeng, Wan Chen, Ao Li, Zhefei Wang, and Jiahui Fu
- Subjects
Physics ,Multidisciplinary ,Invisibility ,Attenuation ,Bandwidth (signal processing) ,Cloaking ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Topology ,01 natural sciences ,Article ,law.invention ,Electric power transmission ,law ,0103 physical sciences ,Scattering-matrix method ,Tunnel diode ,Resistor ,010306 general physics ,0210 nano-technology - Abstract
Parity-time (PT) symmetric structures present the unidirectional invisibility at the spontaneous PT-symmetry breaking point. In this paper, we propose a PT-symmetric circuit consisting of a resistor and a microwave tunnel diode (TD) which represent the attenuation and amplification, respectively. Based on the scattering matrix method, the circuit can exhibit an ideal unidirectional performance at the spontaneous PT-symmetry breaking point by tuning the transmission lines between the lumped elements. Additionally, the resistance of the reactance component can alter the bandwidth of the unidirectional invisibility flexibly. Furthermore, the electromagnetic simulation for the proposed circuit validates the unidirectional invisibility and the synchronization with the input energy well. Our work not only provides an unidirectional invisible circuit based on PT-symmetry, but also proposes a potential solution for the extremely selective filter or cloaking applications.
- Published
- 2017