Active Anomalous Transmission and Its Application in Compensating Waveform Distortions
Chun Wang1, Lei Chen2, Shan Qiao3, Yu-Zhou Shen1, An-Jie Zhu1, De-Xin Ye1, Chang-Zhi Li4, Li-Xin Ran1**
1Laboratory of Applied Research on Electromagnetics, Zhejiang University, Hangzhou 310027 2Beijing Electro-mechanical Engineering Institute, Beijing 100074 3Zhejiang University City College, Hangzhou 310015 4Department of Electrical and Computer Engineering, Texas Tech University, TX 79409, USA
Abstract：In theory, engineered anomalous transmission in passive materials and waveguide devices can be used to compensate for waveform distortions. However, they suffer from inherent dissipation. Recently, active non-Foster elements with imaginary immittance monotonically decreasing with frequency have shown important potentials in broadening bandwidths of electromagnetic devices. So far, they are implemented based on negative impedance convertors (NICs) loaded with Foster devices. This makes them intrinsically one-port elements and thus cannot be used to compensate for distortions of signals. We construct a two-port network with a non-Foster transmission coefficient based on an unconventional use of NICs. Simulation and experiments show that it can compensate for extremely distorted signals. The proposed method can be used to broaden existing applications in different areas such as antennas, circuits and systems, and physical-layer signal processing.
2017, Vol. 34 
